PROCEEDINGS OF THE NATIONAL MUSEUM. 319 



-3r 



scarcely exceeding the previous ones iu diameter 5 caual sliort. Alt. 

 5.5, lat. 1.6 mm. [G.] 



Oligoceiie of Jamaica, Veudryes (Guppy, 2144). No. 107124 

 U.S.N.M. This form is very slightly removed from B. adamsi, Ball, 

 but is somewhat more slender, witli slight differences of sculpture. 



PYRAZISINUS? HAITENSIS, Dall, new species. 

 (Plate. XXIX, fig. 8.) 



Shell large, heavy, of more than 7 \vhorls ; surface smooth or faintly 

 spirally striated on the early whorls; the base flatfish, disk-like, with 

 .strong spiral threads and tiexuous incremental liues; transverse sculp- 

 ture of 7 or 8 short, very high, con)pressed ribs, which do not reach the 

 sutures ; whorls moderately convex, appressed at the suture. Lon. of 4 

 whorls 40, lat. 1^5 mm. 



Oligocene of the island of Haiti, from an island in Lake Heuriquillo, 

 liowell. No. 113G81, U.S.N.M. Two broken specimens, wanting both 

 the aperture and the apex, are obviously of some Cerite. The peculiar 

 sculpture recalls tliat of Pyrazisinus cornutus of the Oligocene of 

 Florida, and what is lelt of the aperture is not inconsistent Avith the 

 supposition that the shell was a species of that genus, to which it is 

 provisionally referred. 



Genus MODULUS, Gray. 



Monodonta (sj>. ), Guppy. 

 Pseiidotrochus, Heilprin. 



MODULUS MODULUS L. var. BASILEUS, Guppy. 

 Monodonta basilea, GupPY, Geol. Mag., Dec. II, I, p. 442, PI. XVI, fig. 2, 1874. 



Oligocene of Jamaica, Veudryes. No. 107137, U.S.N.M. "The young 

 specimens forwarded are not distinguishable from some of the varieties 

 of the recent M. modulus of the same age. The full grown 31. basileus 

 is somewhat characteristic, judging from the single type specimen, and 

 may rank as a variety or subspecies. 



CiECUM, doubtful species. 



Ditrupa bed, Pointapier, Trinidad, Guppy (2266). No. 107150, 

 U.S.N.M. This species for which Mv. Guppy assigned the name of C. 

 (otnulatum, Brown, ^ar. curtum, is more nearly related to ('. instructum, 

 de Folin, of the Antillean recent fauna, but differs by its slightly 

 smaller size and less prominent mucro. 



TURRITELLA ARATA, Guppy, new species. 

 (Plate XXVIII, fig. 3.) 



Elongate, conic-cj^liudric, many-whorled; whorls without any con- 

 vexity, doubly keeled, the interstices between the spiral ridges occupy- 

 ing the middle of the whorl and carrying one or two scarcely visible 



