Title: The Danish Ingolf-expedition
Identifier: danishingolfex2apt1a5daniuoft (find matches)
Year: 1899-1953 (1890s)
Authors: Danish Ingolf-Expedition (1895-1896); Københavns universitet. Zoologisk museum
Subjects: Marine animals -- Arctic regions; Scientific expeditions; Arctic regions
Publisher: Copenhagen H. Hagerup
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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Text Appearing Before Image:
48 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. Length from the foremost end of the slit to the extremity . . 40""" — of the free part 17""" The greatest breadth ca. lo"'™ The length of the terminal part 15'"" In another specimen of the same length and a breadth of ig*^" the appendages were a little shorter and broader, bnt otherwise as fnlly de\-eloped. The skeleton. Between the basale and the appendix- stem are fonnd two pieces b^, /'_,- of which the former is the shorter one (seen dorsally it is nuich shorter), and bears the two hindmost rays (the last bnt one is partly borne by the basale also). The piece /? is long, longer than b^, flat; proximally it articulates with /^,, runs along h, without touching it, and arti- culates distally by an oblique articulation with the appendix-stem'). The appendix-stem is rather straight, calcified in the sur- face until the terminal part, where the mosaic of the surface sud- denly ceases, and the outermost part of the stem is soft, which soft part, chiefly of the same breadth as the harder one, thus corresponds to the style, and reaches to the end of the terminal part, ending with a broadly rounded, convex edge. The marginal cartilages are both calcified, but very un- equallv developed, b\' which the whole appendix gets a peculiar asymmetric appearance; the ventral one2) reaches a trifle longer forward than the dorsal one, but backward it ceases far before this latter; the dorsal cartilage is by a longitudinal furrow apparently di\ided into two pieces of which the lateral one begins forward about the middle of the ventral cartilage, and stretches backward about as far past the hinder end of this latter (see fig-30, 31); this part of the dorsal marginal cartilage is on the ventral side hollowed in a troTigh- or groove-like manner; the medial part of this cartilage, especially the foremost part of it, is slightly calcified, membranous, and is placed like a cover over the appen- dix-slit, so that a narrow slit is left between its outer edge and the ventral marginal cartilage.
Text Appearing After Image:
Fig. 19. P'ig. 19. Torpedo marmoyata. Part of the skeleton of the right ventral, from the ventral side, r the hindmost rays partly cut off. Natural size. Fig. 20. The same preparation from the dorsal side. ') Petri has quite misunderstood the relations of these skeletal pieces, and has upon the whole been ver\- unluck)- in his explanation of the skeletal pieces in Torpedo. Ahead)' his beginning: < Das Skelet von Torpedo besitzt nur sehr ge- ringe Ahnlichkeit mit dem der vorher beschriebenen Arten, promises nothing good; and his description of the terminal parts shows that he has not understood them at all. He has correctly seen that between the basale and the appendix are situated two pieces: fig. 4D, b', i", but their length and position is given less correctly in the figure, which is, Uke all his figures, rather bad; but then he has completeh' overlooked the piece /3 as a separate skeletal part taking it to be a process on the appendix-stem: . Nach vorne eutsendet dasselbe (i.e. the appendix-stem) an der medialen (i.e. the dorsal! Seite neben dem zweiten und dritten GUed des Basale entlang einen Processus, welcher mit dem ersten Basale am hinteren Ende noch in Verbindung stehtv. As a homologou to the piece /J in Acanthias (Petri's fig. 5 r) he takes a little piece (fig. 4 D. r), which is said to bear the two last rays and to have originated from a coalescing of the proximal joints of those: Rinnenknorpel : Fig. 4 D and E, c and /; I", /; (and pi. XVII, fig. 4 B, /); the skeletal piece, however, interpreted by Petri as a dorsal marginal cartilage and marked /, is ouly the firm lateral part of tlie dorsal marginal cartilage; the thin, cover-shaped part seems to be removed, except on fig. 4 B, representing the muscles.

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