1921] NATURAL SCIENCES OF PHILADELPHIA. 335 



Oliva cylindrica Sowerby. Plate XXIII, figs. 2, 3. 



Olii-a ciiUndricn Sowerby, Q. J. Geol. Soc. vi, 1849, p. 45. 



Oliva giraudi Cossmann, Journ. de Conchj-l., \si, 1913, p. 56, pi. 5, figs. 1, 6-8 

 (Martinique), figs. 4, 5, (Saint-Domingue.) 



This abundant Olive is distinguishable from 0. reticularis by the 

 wider, more cylindric form, the lower spire composed of flat (not 

 concave) whorls. The shape is much more like Oliva splendidula 

 Sowb., of the west coast of Central America. 



There is the usual variation in height of the spire and degree of 

 concavity of its outlines, such as occurs in most species of Oliva. 



Length 52, diam.25mm. (PL XXIII, fig. 2). The largest specimen 

 of a very long series is 60.5 mm. long. 



M. Cossmann has figured a quite small specimen from Santo 

 Domingo, under the name Oliva giraudi, but which appears to us 

 indistinguishable from 0. cylindrica except by its smaller size. The 

 length he gives for the species, 93 mm. is probably an error for 33 

 mm. 



Oliva proavia Pils. and Johns. Plate XXIIl, fig. 1. 



Proc. A. N. S. Phila., 1917, p. 164. 



This fine Olive requires comparison with 0. cristohalcoloni Maury, 

 which may prove to be an immature specimen of the same species. 

 It is relatively broader, with a differently shaped spire and more 

 fully developed plaits on the inner lip. 



Oliva brevispira Ciabb. Plate XXIII, flg. 4. 



Oliva hrevispira Gabb, Tr. Am. Philos. Soc. xv, 1873, p. 215. 



This species resembles 0. reticularis in form, but is distinguished 

 from other Tertiary and recent species of the region by its very 

 short spire. The greatest width is above the middle. About 30 

 small plaits are on the inner lip. These are somewhat unequal and 

 unevenly spaced, some being spaced by pairs. The siphonal fas- 

 ciole is strongly obhque, its upper ledge entering above the middle 

 of the inner lip. 



Length 34.5, diam. 14 mm., length of aperture, measured to the 

 suture, 30 mm. 



The type, no. 2997 A. N. S. P., is somewhat worn, and none of 

 the six examples is quite perfect. By the shape of the columella it 

 has some resemblance to 0. nehulosa Lam. 0. brevispira of Maury 

 is a different species. 



Oliva gradata Gabb. Plate XXIII, figs. 10, 11. 



Oliva gradata Gabb, Tr. Am. Piiilos. Soc. xv, 1873, p. 215. 



The special character of this species is that there is a sharp though 



