338 BULLETIN OF THE 



Simpulopsis corrugatus, Guppt, 



Trinidad. Mr. Giippy to ^Ir. Bland. 



Jaw not observed. Lingual membrane (PI. I. Fig. G) of the same type as 

 figure, for S. sulculosus, by Heynemann, ]\Ialak, Blatt., XV., PI. V. Fig. 10. 

 I find the central teeth in this species distinctly tricuspid. 



Bulimulus Schiedeanus, Pfr. (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, etc. 

 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 plainl}' 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 Bui. dealliatus, Say. in Terr. Moll. U. S., V. (See PI. 

 I. Fig. T.) 



Bulimulus immaculatus, Ad. (Thaumastus). 



Jamaica. 'Mv. Bland from ]\Ir. Gloyne. 



Jaw as usual in the genu.s with over 36 ribs. 



Lingual membrane (PI. I. Fig. D) as in B. laticinctus, BaJiaynensls, aurts- 

 leporis, papyraceus, membranaceus, &c. Teeth very numerous ; h shows a mar- 

 ginal tooth. 



Macroceramus inermis, Gundl. ? 



Curasao. Mr. J. S. Gibbons. 



Lingual membrane as in Macr. Gossei (see Terr. Moll. U. S., V. 386 PI X. 

 Fig. Q). 



Cylindrella Chemnitziana, Fer. 



Jamaica. Mr. Thomas BLind. 



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, PI. IV. Fig. 1). 



There are lO-l-lO teeth, with two laterals on each side of the central tooth. 



Omalonyx felina, Guppt. 



Demarara. Mr. J. S. Gibbons to Mr. Bland. 



Jaw as usual in the genus. 



Lingual membrane (PI. I. Fig. J) quite similar to that observed by me in 

 indiviiliials of the same species from Trinidad (Ann. Lye. Nat. Hist, of New 

 York, X. 346). Mr. Bland ami myself have expressed our opinion (1. c.) 

 thai felina is identical with O. unguis. 



