REPOET ON THE HETEROPODA. 
31 
A specimen obtained by the Challenger near Papua, and of which the anterior portion 
is wanting, probably belongs to this species, as the small shell agrees very well in form 
with the upper part of adult specimens with which I have compared it. The skin is 
minutely tuberculated, and the crest of the caudal extremity is rather broad and 
commences quite close up to the nucleus. The figure (fig. 4) represents the natural size. 
Three very young specimens of Carinaria, which probably belong to this species, were 
c 6 
Fig. Z.— Carinaria cristata (young) ; a, left side ; b, right side (magnified about seventeen diameters). 
captured between the Admiralty Islands and Japan. One of these has the minute shell 
attached, and is represented in the accompanying woodcut. The embryonic helicoid shell 
is very peculiar, and it is remarkable that it has never been described as a genus of 
itself, as has been the case with the embryonic shells of other Gastropods. 
The name most frequently applied to this species is that of Carinaria vitrea. This 
is owing to the fact that Lamarck employed it in preference to that of cristata, which he 
placed in the synonymy. There can be no question that the Patella cristata of Linne is 
Fig. 4. — a, Carinaria cristata, ; b, shell. 
undoubtedly this species, and therefore that name should be retained. The form described 
by Eeeve as Carinaria gracilis, which he subsequently regarded as a variety of this 
species, is distinguished by the straightness of the keeled edge, which is much less 
curved than the typical form as represented by the figures of Argenville and others. The 
adult animal of Carinaria cristata must be of considerable dimensions, and it is remark- 
able that it has never been discovered. 
