308 AXTILLEAN FOSSILS— GUPPY AND BALL. 



related to C. urccolata, Hinds, found living- on the west coast of Middle 

 America. 



OLIVA PLICATA, Guppy, new species. 

 (Plate XXX, fig. 12.) 



Cylindrical; spire conic; apex prominent; wliorls 7; suture deeply 

 channeled; columella with 10-12 strong plaits. Alt. 1L*,2, hit. 5 

 mm. [G.] 



Oligoceue of Jamaica, Vendryes (Guppy, 2288). Ko. 107090, U.S.N.M. 



OLIVELLA INDIVISA, Guppy, new species. 

 (PlateXXX, Ijg. 10.) 



Elongate-conic; whorls about 0, the last about thrce-fourtlis of the 

 length of the shell. Allied to 0. oryza, of which it may be considered 

 a Miocene form. Alt. 6.5, lat. 1.5 mm. [G.] 



Oligocene of Jamaica, Veudryes (Guppy, 2287). No. 107089, U.S.N.M. 



OLIVELLA, doubtful species. 



Specimens of very young and indeterminal>le species of OUrcUa were 

 found in some numbers in the Ditrupa bed at Pointapier, Trinidad, by 

 Guppy. 



MARGINELLA SOLITARIA, Guppy, new species. 

 (I'latc XXIX,lig. 14.) 



Oblong; whorls about 4; spire conic; ai)e.\: obtuse; aperture somewhat 

 narrow, expanded anteriorly into a round, spout-like canal; lip thick- 

 ened and strongly (4) dentate; columella twisted, with two strong folds 

 and two teeth on the body whorl. Alt. 3, lat. 1.5 mm. [G.] 



Ditrupa bed, Pomtapier, Trinidad, Guppy (2268). No. 107139, 

 U.S.N.M. 



MARGINELLA (PERSICULA) ARCUATA, Guppy, new species. 

 (Plate XXIX, lig. 13.) 



Oval, solid, somewhat flattened; inner lip strongly dentate, outer lip 

 sharp, dentate within; aperture curved, as long as the shell; spire 

 very short. Alt. 4.5, lat. 3.5 mm. [Ir.] 



Ditrupa bed, Pointapier, Trinidad, (iuppy (2253). No. 107141, 

 U.S.N.M. The only specimen is obviously immature, but is related to 

 M. gravida^ Dall, and its i>redecessors in the Floridiau Chipola beds. 



MARGINELLA LATISSIMA, Dall, new species. 

 (Plate XXIX, iig. 11.) 



Shell small, very solid and broad, externally smooth and polished, a 

 wash of callus obscuring a very low spire of about 3 whorls; base 

 callous; outer lip broad, thick, with a groove behind it and a low callus 



