308 BULLETIN OF THE 
Simpulopsis corrugatus, Gurry. 
Trinidad. Mr. Guppy to Mr. Bland. 
Jaw not observed. Lingual membrane (Pl. I. Fig. G) of the same type as 
figure, for S. sulculosus, by Heynemann, Malak, Blatt. XV., Pl. V. Fig. 10. 
I find the central teeth in this species distinctly tricuspid. 
Bulimulus Schiedeanus, Prr. (THAUMASTUS.) 
Texas. Professor A. G. Wetherby. 
Jaw slightly arcuate, ends scarcely attenuated, blunt; anterior surface with 
17 ribs, denticulating either margin. It is difficult to decide the exact character 
of these ribs. I have usually called the ribs in Bulimulus, Cylindrella, ete. 
narrow and widely separated. They should, perhaps, be described as very 
broad, with narrow interstices, and with a gradual increase of thickness towards 
their outer longitudinal margin. This plainly thickened margin is what I have 
formerly described as narrow ribs. In the jaw before me there is no tendency 
to oblique arrangement of the ribs at the upper central portion of the jaw. 
The lingual membrane is long and narrow. Teeth of the same type as 
described by me under Bul. dealbatus, Say, in Terr. Moll. U.S., V. (See Pl. 
Te Big. 25) 
Bulimulus immaculatus, Ap. (THaumastus). 
Jamaica. Mr. Bland from Mr. Gloyne. 
Jaw as usual in the genus with over 36 ribs. 
Lingual membrane (Pl. I. Fig. D) as in B. laticinctus, Bahamensis, auris- 
leporis, papyraceus, membranaceus, &c. Teeth very numerous; 6 shows a mar- 
ginal tooth. 
Macroceramus inermis, Gunpt.? 
Curacao. Mr. J. 8. Gibbons. 
Lingual membrane as in Macr, Gossei (see Terr. Moll. U. S., V. 386, Pl. X. 
Fig. Q). 
Cylindrella Chemnitziana, Fir. 
Jamaica. Mr. Thomas Bland. 
The lingual membrane is of the same type as the other species of the sub- 
genus Cylindrella, s. s., described and figured by Crosse and Fischer (Journ. 
de Conch., 1870, Pl. IV. Fig. 1). 
There are 10-1-10 teeth, with two laterals on each side of the central tooth. 
Omalonyx felina, Gupry. 
Demarara. Mr. J. 8S. Gibbons to Mr. Bland. 
Jaw as usual in the genus, 
Lingual membrane (Pl. I. Fig. J) quite similar to that observed by me in 
individuals of the same species from Trinidad (Ann. Lye. Nat. Hist. of New 
York, X. 346). Mr. Bland and myself have expressed our opinion (l. c.) 
that felina is identical with O. unguis, 
ea aa 
