118 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Locality. Angela Elmira asphalt mine, near Bejucal, Cuba, station 

 5312, Wiebusch. 



Geologic horizon. Oligocene? 

 Type.U. S. Nat. Mus. No. 166994. 



Hemisinus bituminifer, new species. 

 (Plate 3, Figure 2.) 



The following is a description of this species: 



Whorls convex, obsoletely shouldered; suture impressed; costae terminating 

 abruptly close behind the suture, retractive in posterior quarter of the shell, 

 protective in anterior three-quarters, 22 on penultimate whorl, 27 on body- 

 whorl; shoulder nearly smooth; about 10 low, spiral threads on whorls in front 

 of the shoulder; base of body-whorl with numerous fine, even, spiral threads. 

 Aperture broadly oval; inner lip with a thin callus. 



Length of a fragment of about 1% whorls, 21.7 mm.; altitude of bodywhorl, 

 16.8 mm.; diameter of body-whorl, 18 mm.; length of aperture, about 10 mm. 



Locality. Angela Elmira asphalt mine, near Bejucal, Cuba, station 

 3652, Wiebusch. 



Geologic horizon. Oligocene? 

 Type. U. S. Nat. Mus. No. 166993. 



Hemisinus atriformis, new species. 

 (Plate 3, Figures 4, 5.) 



The following is a description of this species: 



Shell stout, of about 8 or 10 whorls, 5^ remaining on the decollated type; 

 whorls cylindrical to convex, twice as wide as high. Axial sculpture of numer- 

 ous close, slightly protractive ribs rendered strongly nodose by close impressed 

 revolving lines. The axial sculpture is dominant at first, but is exceeded in 

 strength on the large whorls by the spiral sculpture. Aperture crushed in all 

 the specimens at hand, but apparently broadly oval and flattened in front. 

 Inner lip callous, arcuate; outer lip thin. 



Alt., 15.5 mm.; diam. of body-whorl, 8 mm. 



The sculpture of this shell is strikingly similar to that of plicate 

 varieties of Doryssa atra inhabiting rivers in British Guiana. 



This species, much broader than H . siliceus, with which it is asso- 

 ciated, possesses nearly the same proportions as the cast from the same 

 locality which has been unrecognizably figured by Brown and Pilsbry 

 under the name of H. latus. 1 



Locality. Dry Hill Point, Antigua, station 6867, Vaughan. 



Geologic horizon. Oligocene. 



Type.U. S. Nat. Mus. No. 166996. 



Hemisinus antiguensis Brown and Pilsbry. 



(Plate 3, Figures 6, 7, 8, 9.) 



Hemisinus antiguensis Brown and Pilsbry, Proc. Acad. Nat. Sci. Phila., p. 210, plate 9, figs. 

 1, 3, 5, 6, 1914. 



1 Proc. Acad. Nat. Sci. Phila., p. 211, plate 9, fig. 4, 1914. 



