320 ANTILLEAX FOSSILS— GUPPY AND BALL. vol. xix. 



threads; aperture quadrate; suture fine, linear; base smooth. Alt. 

 10.3, hit. 1..") mm. [G.] 



Oligocene of Haiti, Guppy (L»l»80). No. 107085, U.S.N.M. 



TURRITELLA, doubtful species. 



Shell bed. Ally Creek, Xapariuia, Trinidad, Guppy (L'119). No. 107121, 

 TJ.S.K.M. A specimen of Turritella or immature Vermicular ia too 

 imi)erfeet to detiiie specifically was obtained as above. Loii. C, lat. 3 

 mm. It wants botli apex and base, but is furnished with sharp, revolv- 

 ing ridges, of which two very i:)rominent ones divide each whorl into 

 three parts, of which the deep one next below the scarcely visible 

 suture contains three tine spiral linos, and the narrower one on the 

 middle of the whorls between the two prominent keels contains one fine 

 spiral line. 



MATHILDA PLEXITA, Dall, new species. 

 (Plate XXIX, fig. 5.) 



Shell small, elongated, turrited, with deep sutures and 13 strongly 

 rounded whorls ; sculpture reticulate; spiral sculpture of 4 to 6 rounded 

 prominent threads alternated with much finer threads; there are also 

 3 of intermediate size on the base ; these are crossed by regularly spaced, 

 very narrow laminar transverse ridges, which are slightly nodulous 

 at the intersections ; top and base of the whorls flattened, with a minute 

 umbilical chink; aperture subovate, entire, with shari) margin, a little 

 moditied by the sculpture on the outer lip; throat not lirate, but the 

 external sculpture indicated by shallow sulci. Lon. 18.3, lat. 6 mm. 



Oligocene of Jamaica, Henderson and Simpson. No. 11543G, F.S.N.M. 

 (tigured). Ditrupa bed, Poiutapier, Trinidad, Guppy (2115). No. 107120, 

 U.S.N.M.; fragment. This fine species has somewhat the aspect of a 

 reticulated Secda of the subgenus AcHUa, under which name it was 

 sent in. BCvSide the fragment sent by Mr. Guppy from Trinidad, it has 

 also been noticed in the Oligocene beds of the Isthmus of Darien at 

 Monkey Hill. 



FOSSARUS (GOTTOINA) MUNDULUS, Guppy, new species. 

 (Plate XXVII, fig. 16.) 



Turbinate, rimate; whorls 4-5, with spiral sculpture of subequal regu- 

 lar ridges, of which three are visible on the upper whorls, and these are 

 simple, while on the last whorl the spiral scul])ture is reti(;ulated by 

 transverse, elevated, incremental lines; suture deep and well marked; 

 base with similar spiral sculpture and an extremely narrow umbilical 

 chink ; aperture circular, thickened, and slightly dentate or lirate. Alt. 

 3, lat. 2.75 mm. [G.J 



Oligocene of Jamaica, Vendryes (Guppy, 2291). Nos. 107093 and 

 107094, F.S.N.jM. This s[)ecies is not unlike some larger lecent forms 

 found in deep water ofi' the southeastern coast of the United States. 



