NO. 1110. PROCEEDINGS OF THE NATIONAL MUSEUM. 317 



TURBONILLA SIMPLICIOR, Guppy, new species?. 

 rPlate XXVIII, fig. 1.) 



This has a stouter appearance. A specimen of it with 35 whorls has 

 a tendency to a subquadrate shape of aperture. It has no spiral lines 

 between the longitudinal riblets. Alt., 7.5 mm. [G.J 



Oligoceue of Jamaica, Vendryes (Guppy, 22o8b). No.l07116,U.S.N.M. 



TURBONILLA TENUILINEATA, Guppy, new species?. 

 (Plate XXVIII. fig. 8.) 



In this form, which would generally be regarded as a distinct spe- 

 cies, the ornamentation is reduced to 4 or 5 very tine spiral lines. The 

 aperture is subquadrate in our specimens, but this feature may vary 

 to some extent. Alt., 5 mm. [G.] 



Oligoceue of Jamaica, Vendryes (Guppy, lil'oSc). No. 107117, U.S.KM. 



TURBONILLA (STYLOPSIS) OCTONA, Guppy, new species. 

 (Plate XXVII, fig. 8.) 



Turrited, somewhat fusiformly cylindrical; smooth or oidy striate 

 longitudinally by lines of growth; whorls about 4-5 (in addition to the 

 discoid sinistral apex of about 3 turns set on at an angle), augulated 

 above, and separated by a deep suture; aperture suboval, angulate 

 above and somewhat produced anteriorly; columella retiected, the callus 

 spread over the pillar lip. Alt. 1.25, lat. 0.3 mm. [G.J 



I)itrupabed,Pomtapier,Trinidad,Guppy(2120). ]S'o.l0707S,U.S.N.M. 

 This may be compared with Adis similUma, Smith, from St. Helena, and 

 EuUma sHhci/lindrata, Dunker. 



OSCILLA INDISCRETA, Guppy, new species. 

 (Plate XXVIII, fig. U.) 



Subulate-turrited; whorls about 9, flat, adorned with three strong 

 squarish spiral ribs or keels, narrower than their deep interstices; the 

 ui)per rib on a whorl in contact with the lower one on the preceding 

 whorl, thus almost masking the suture; these two ribs sometimes nodu- 

 lous; aperture suboval; base with a spiral rib dividing the space 

 between the keel on the angle of the whorl from the plaited and 

 twisted columella. Near the apex the lower and upper keels are more 

 nodulous and are fused together so as to form apparently only one 

 keel. Alt. 6, lat. 2 mm. [G.j 



Oligoceneof Jamaica, Vendryes (Guppy, 2148). No. 107074, U.S.N.M. 

 This may be compared with the recent 0. {Triptyehn.s) nivea of Morch, 

 from which it differs in details of sculpture, as also from the synony- 

 mous 0. hiseriata, Gabb, of the Costa Rica Pliocene. 



