8 STOMA TEL LA. 



of the anatomy only can definitely settle this point. There seems to 

 be an almost perfect transition in some species of Stomatia to this 

 genus ; in these again, we await a knowledge of the animal to 

 definitely group them. There is also a certain analogy between 

 some Stomatelloe, such as S. coecinea, and the species of Gena having 

 carinated upper whorls, G. rosea for example. The transition to 

 Stomatia seems to be formed by S. notata Ad. and other forms of 

 that group. 



The writer has given the results of an examination of an alcoholic 

 specimen of the animal of Stomatella Godeffroyi Dkr. (=S. mariei 

 Crosse, var.) in Proc. Acad. N. S. Phila., 1890. Part of the figures 

 are reproduced on pi. 22, figs. 30-33. The foot is broad and fleshy, 

 deeply divided by a median longitudinal groove and transversely 

 wrinkled, emarginate posteriorly. Its upper surface is granulate and 

 tuberculate. The muzzle is rather broad, transversely wrinkled, 

 ending in a flat, oval disc, the mouth about in the center ; tentacles 

 stout but tapering ; eyes on peduncles outside and a little above the 

 bases of the tentacles ; these peduncles are short and stout. The 

 epipodial ridge commences on a short triangular lobe behind the 

 right eye-peduncle ; the edges of this lobe are somewhat upturned, 

 like a short trough. Along the sides of the foot the ridge is prom- 

 inent, fleshy ; and bears two short slender cirri ; it terminates 

 posteriorly at the operculigerous lobe. On the specimen before me 

 there is no operculum, and the hind margin of the foot is upturned 

 partly over the lobe, probably from contraction in alcohol. There 

 are two minute frontal lobes between the tentacles, not connected 

 across the muzzle. No external male organ was observed. The gill 

 is single, composed of numerous (about 130) narrow plates, arranged 

 in one series, its anterior third free. The anus opens at the summit 

 of a short peduncle. 



The radula bears a general resemblance to that of some Trochidce. 

 The rhachidian tooth has a broad expanded base, narrowed, reflexed 

 and denticulated at apex ; the laterals (5 on each) are quite compli- 

 cated in form (see Proc. Acad. Nat. Sci. Phila., 1890) ; their cusps 

 are well reflexed and denticulate. The inner uncinus has a very 

 broadly expanded, triangular body and narrow cusp ; the following 

 uncini are narrow, not notably different from the usual conformation 

 in Rhipidoglossa. The outer uncini have very long, serrate cusps. 

 The figures on pi. 22 are considerably enlarged. A specimen collect- 



