INSTITUTE OF SCIENCE, PHILADELPHIA. 45 



of 0. reticularis from the coast of the United States, or north of the Florida 

 Keys and the Bahamas, in a recent state. Both species occur in the Miocene 

 of Bowden, Jamaica, and the Haitian Miocene. Both are also found there in 

 the recent state. From the Costa Rica Pliocene Gabb reports only the 0. 

 reticularis, but it is quite possible that the " 0. ispiditla" which he cites from 

 that formation is merely a variety of 0. litterata. Sowerby's 0. cylindrica 

 certainly contains both species, but was diagnosed on the 0. litterata. As 

 Meuschen was not a binomial writer, his name should not take precedence of 

 the one given by Lamarck. After careful comparison I have not been able to 

 find any distinctive character by which Conrad's 0. carolinensis might be dis- 

 tinguished from the recent 0. litterata. The differences which one may ob- 

 serve in a few individuals are shown by a large series not to be characteristic 

 of anything but stages of growth, absence of color and individual mutation. 



Genus Olivella Swainson. 



Olivella mutica Say. 



Oliva sp. Emmons, N. Car. Geol. Rep., p. 259, fig. 131 a, 1858. 



Oliva mutica Holmes, Post-Pleioc. Foss. S. Car., p. 76, pi. xii. fig. 8, i86o. 



Oliva muticoides Gabb, Geol. Santo Domingo, p. 215, 1873. 



Oliva duplicata Conrad, Proc. Acad. Nat. Sci. Phila. I. p. 309, 1S43. 



Miocene of Santo Domingo, West Florida and North Carolina; Caloosa- 

 hatchie beds, Florida ; Post-Pliocene of South Carolina and Florida. Recent 

 from the coast of the Carolinas southward to the West Indies. 



Gabb's variety muticoides differs chiefly by the state of its development 

 from the typical form of recent seas in some of its multitudinous varieties. It 

 has never been figured. The Caloosahatchie specimens resemble the recent 

 form precisely, as do authentic specimens of Conrad's duplicata. Both pass 

 through a similar series of mutations between individuals. 



Olivella nitidula Dillwyn. 

 Olivella nitidula Dillwyn, Tryon, Man. v. p. 64, 1883. 



Caloosahatchie beds. Recent in Florida and the West Indies. 



This form is referred to O. mutica as a variety by Tryon, and it may well 

 be a large race of the preceding species. It is, however, not difficult to sepa- 

 rate, and I have preferred to keep it so for present convenience. 



From the Miocene of Bowden, Jamaica, I have received . jaspidea Gmelin 

 and its variety rottinda Dall, but I have not identified any specimens from the 

 Caloosahatchie beds, though the species is found recent on the Florida coast. 



Olivella lata n. s. 



Plate 4, figure 8 b. 



Shell small, broad, moderately stout, with a rather low spire and about 



five whorls ; surface smooth, suture narrow, deeply channelled and deeply 



notched at the aperture ; spire with little enamel and a rather large globular 



