344 TRANSACTIONS OF THE WAGNER FREE 



hatchie beds and of Italy ; living in the Antilles, the Mediterranean, at Panama, 

 and in the Indo-Pacific region. 



The full synonymy of this ancient and widely spread species will be 

 found in the monograph of Schwartz von Mohrenstein above cited. The 

 Caloosahatchie form differs slightly from the type, being proportionately 

 wider, with the whorls flatter, the sculpture less sharply defined and tending 

 to become obsolete ; the shell is also somewhat larger, and may constitute a 

 variety planata. It measures 8.3 mm. long and about 3 mm. wide. 



Family ADEORBID^. 

 Genus ADEORBIS S. Wood. 

 This genus has recently been shown by Verrill to be related to the Ris- 

 soidce more nearly than to the similarly formed Trocliidce, which have usually 

 been associated with Adcorbis. The form of the spire is rarely a family char- 

 acter ; but, taking all things into consideration, I proposed in 1889 to sepa- 

 rate Adeorbis and its allies in a family by themselves. The group is quite 

 ancient. The Adeorbis exac7ia Conrad (as Solarium, -f- Dclpliinnla plana Lea) 

 is only to be discriminated from A. Beard Fischer, of the present fauna of 

 Florida and the Antilles, by the fact that, in the fossil, the basal carina forms 

 the periphery, while in the recent shell it is contracted to a smaller radius 

 than the next anterior carina. 



Adeorbis supranitidus S. Wood. 



Typical Form. 

 Adeorbis supranitidus Wood, Cat. 1842, Crag Moll., p. 137, pi. xv. figs. 5 a, 5 b, 1S4S. 

 Skenea Irilix Bush, Trans. Conn. Acad. vi. p. 464, pi. xiv. fig. 7, 1SS5. 



Var. Orbigfiyi Fischer. 

 Adeorbis Orbignyi Fischer, Journ. de Conchyl. vi. pp. 173, 286, 1S57. 

 Onialaxis? lirata Verrill, Trans. Conn. Acad. v. p. 529, 1882. 

 Skenea lirata Verrill, op. cit. vi. p. 452; Bush, vi. p. 464, 1S85. 

 Adeorbis supranitidus var. Orbignyi Dall, Blalce Gastr., p. 278, 1889. 



Older Miocene of Santo Domingo, Gabb, and of the Chipola beds, Cal- 

 houn County, Florida, Burns ; Chesapeake Miocene of St. Mary's, Md., Will- 

 cox, and of the Natural Well, Duplin County, N. C, Burns ; Newer Miocene 

 of Cape Fear River, N. C, Johnson ; Pliocene of continental Europe and of 

 Britain, also in the Waccamaw beds of South Carolina, at Tilly's Lake, John- 

 son ; living on the coast of the Eastern United States from Cape Cod south- 

 ward, and widely distributed on the opposite shores of the Atlantic. 



For variations in this species consult the Blake Report, p. 278; similar 

 variations are found with the type-form from the early Miocene. 



There is much probability that Adeoi'bis infracarinata Gabb (Journ. Acad. 

 Nat. Sci. viii. p. 365, pi. 46, fig. 62, 1875), Vitriiiella triincaia Gabb {op. cit. p. 

 367, pi. 47, f 65), from the Pliocene clays of Costa Rica, and V. pentago?ia 



