l68 TRAN6ACTIONS OF THE WAGNER FREE 



laterally; the teeth are rather variable in strength and number, apart from differ- 

 ences due to age. The base in life seems to have been white, the dome yel- 

 low brown with darker dots of color. Notwithstanding the. beautiful preser- 

 v^ion of some of the specimens, I have been unable to find any trace of the 

 line which on recent Cyprseas marks the junction of the two mantle-lobes on 

 the dome of the shell. 



Of recent species, Cypraa cdeniiila, from the Cape of Good Hope, recalls 

 the younger stages of this shell. The only approach to the fossil among 

 recent Antillean forms, so far as known, is shown by Cyprcza mus L., where 

 there is a short, shallow channel in some specimens extending upward from 

 the posterior commissure, while the young shell has a rather blunt spire. But 

 in all the recent Antillean species the aperture in the adult terminates to the 

 right of the apex of the spire, and so far as I know, in the whole family, C. 

 problematica is the only species in which the terminal commissure is bent to 

 the left of the apex, to say nothing of coiling around it. 



Genus TRIVIA Gray. 

 Trivia suffusa Gray. 

 Trivia pediculus Tuomey & Holmes (non Lin.), Pleioc. Fos. S. C, p. 127, pi. 27, fig. 3 a, 

 b, 1857. 



Caloosahatchie beds. Pliocene of South Carolina. Miocene of North 

 Carolina ? [Emmons]. Recent, Florida from Cedar Keys southward, and in 

 the Antilles. 



Trivia pediculus Linn6. 



Miocene of the Carolinas ? Pliocene of Costa Rica and the Caloosahatchie 

 beds. Recent in the Antilles and South Florida. 



Trivia globosa Gray. 



Caloosahatchie beds. Recent in the Gulf of Mexico and among the An- 

 tilles. 



Genus ERATO Risso. 

 Erato Maugeriae Gray. 

 Erato Maugeria: Gray, S. V. Wood, Crag. Moll, i, p. 19, pi. ii. figs. 11 a, 11 b. 

 Erato Icevis Emmons (non Donovan), N. Car. Geol. Rep., p. 262, fig. 139, 1S58. 



Miocene marls of Cape Fear River, North Carolina, Emmons. Plio.cene 

 of Shell Creek and the Caloosahatchie beds, Florida. Red and Coralline Crag 

 of Sutton, England, Wood. Recent, from the North Carolina coast at Cape 

 Hatteras to the West Indies. 



This little shell is rather common in the Caloosahatchie marl. 



Mr. Tryon in his monograph .speaks of seeing plaits on the pillar of young 

 specimens of Erato. My observations do not confirm this. The adult Erato 

 has the anterior margin of the pillar a little thickened, with a short groove 

 behind it and a few faint denticles on the body opposite the outer lip. The 



