1855..
SALTER — HIMANTOPTERUS.
33
we do not yet know the head of the latter, we must for the present
keep the species distinct ; and I propose to dedicate it to Mr. R.
Banks of Kington, who has lately been making discoveries amongst
the tile- stones, and has sent good specimens of this and other fossils
to London.
Phyllopoda ?
Among the Lanarkshire specimens, so well collected by Mr. Sli-
mon, are perfect forms of the genus Ceratiocaris, M'Coy*. Only
the carapace has hitherto been discovered ; but the occurrence of
body-rings in the Dudley limestone has been for some time known ;
and in the Ludlow Museum I lately saw such body-segments con-
nected with the long triple tail-spines now known under the name of
Leptochelesf.
Fortunately these specimens from Lesmahago have all the parts
in juxtaposition, and show the animal to have been a large Apus-like
Crustacean, with a carapace bent sharply down the dorsal line,
pointed anteriorly and truncated behind, and with an elongate ab-
domen of at least five, if not six, joints, — the hinder ones longest.
The last joint is a thick striated spine, with a bulbous articulation,
and has a pair of lateral spines or appendages at its base, nearly as
long as itself.
Fig. 8. — Diagram q/" Ceratiocaris, M'Coi/, with hody and tail-spines
attached ; from perfect specimens found in Lanarkshire.
The resemblance to Hymenocaris, except in the presence of the
strong caudal spines, is sufficiently clear from the accompanying
woodcut (fig. 8).
Now that we know the entire structure of this genus, it must be
removed from the Limnadiadce.
It has a nearer resemblance to Apus and Dithyrocaris, but differs
at once from the latter genus by the deflected sides of the carapace,
and apparently too by the want of regularly-shaped smooth eyes, for

• Synopsis Brit. Pal. Foss. Cambridge Mus. fasc. 1. p. 137.
  

t M'Coy, Syu. Brit. Pal. Foss. Camb. Mus. fasc. 1. p. 175.