MUSEUM OF COMPARATIVE ZOOLOGY. 335 
Cionella Gloynei, Grezoys, n. sp. 
Under stones at Curacao. Mr. J.S. Gibbons. (Pl. I. Fig. H.) 
Both jaw and lingual membrane are as usual in this genus and its allies, 
(See Terr. Moll. U.S, V.) The figure gives one central and its adjacent lat- 
eral tooth. 
Pupa contracta, Say. 
To the synonymy add Pupa Cincinnatiensis, Judge, Quarterly Journal of 
Conchology, I. 343, fig., 1878. 
Hemitrochus Milleri, Prr. 
Fortune Island, Bahamas. Dr. J. J. Brown to Mr. Bland. 
Jaw arched, high, ends blunt, scarcely acuminated: anterior surface with one 
single rib-like prominence, extended into a decided median projection to the 
cutting edge of the jaw. (Pl. I. Fig. B.) | 
Lingual membrane with about 33-1-33 teeth. Pl. I. Fig. A shows the grad- 
ual change from centrals to extreme marginals. The same type of teeth has 
been noticed by me in varians, Troscheli, graminicola, and gallopavonis. These 
_ species differ, however, from Milleri by having no rib-like prominence on the 
_ anterior surface of their jaw, but a simple median projection to its cutting edge. 
_ Like variation as to the presence or absence of ribs on the jaw has been no- 
| ticed by me in Dentellaria and other genera, a fact throwing doubt on the value 
_ of the character of ribs on the jaw as of generic weight. 
Plagioptycha Duclosiana, Fir. 
Exuma, Bahamas. Dr. J. J. Brown to Mr. Bland. 
Jaw as described under Hemitrochus Miller. 
Lingual membrane with about 30-1-30 teeth. The changes from central to 
marginal teeth are shown in Pl. I. Fig. C. 
Microphysa Stearnsi, Bu. 
Olympia, Washington Territory. H. Hemphill. 
From an examination of the jaw and lingual dentition it appears that this 
| Species is not a Zonites, as originally described, but rather a Microphysa, like 
_M. Lansingt and M. Ingersoll. With the former it shares the peculiarity of 
_ having a ribbed jaw and aculeate marginal teeth to its lingual membrane. (See 
Terr. Moll., V. 172, Fig. 21.) 
The jaw has over 19 ribs of the same type as those of M. Lansing: (1. c.). 
(See Pl. I. Fig. N.) A portion only of the jaw is figured. 
The lingual membrane (Pl. I. Fig. M) has four laterals on each side of the 
central tooth. 
Triodopsis vultuosa, Gout. 
Texas. Professor A. G. Wetherby. On Pl. II. Fig. C, is given a figure of 
the dentition of this species, which I have described on p. 318 of Terr. Moll. 
U.S., Vol. V. 
