GASTEROPODA. 925 
equivocally this singular character.”” These processes had doubtless 
become so contracted by immersion in alcohol as to be invisible; but 
the figures we have now the opportunity of presenting, drawn also from 
living specimens, and which correspond so well with the figure of A. 
longicauda, leave us no longer in doubt as to the existence of a genus 
with this characteristic, with at least three species. The papille on 
the mantle are capable of being individually elongated and contracted, 
as they are in Cyprea. 
STYLOCHEILUS LINEOLATUS (Gould). 
Corpus viride, lineis ferrugineis longitudinalbus parallels contortis, 
et ocellis inequalibus remotis ornatum ; papillis remotis, ramosis ; 
tentaculis antertoribus subulatis, nudis. 
Anrmat elongated, delicately attenuated posteriorly, of a pale grass- 
green colour, ornamented with longitudinal, parallel, contorted, rusty 
lines, and scattered ocelli of unequal size. The papille of the mantle 
are branching. The anterior tentacles are short, tapering, and desti- 
tute of papille. 
Length three and a half inches. 
Found on a coral reef at Honolulu, Oahu. 
Dr. Pickering, who observed this animal, remarks, that the creeping 
disk is very long, ending in a sharp point. Branchial cavity gene- 
rally kept pretty wide open; the branchie are very large, not covered 
by a dorsal plate, and coloured above in the same manner as the 
mantle, and they are inflated as though injected with water. The 
heart is seen beating on the left side, immediately under the origin of 
the branchiew. The vent projects much as in Doris. The lines on 
the surface were more or less concentric, like the strie in the palms of 
the hands. Motions quite active. 
Though the two figures differ somewhat in their details, I judge 
them to represent the same species. In the dark green one, the tenta- 
_ cles are shorter, and the cephalic pair are destitute of papille, and the 
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