4IO . TRANSACTIONS OK THE WAGNER FREE 



smaller, beaded spirals rather variable in character; summit and base of the 

 whorls flattened ; umbilicus wide and deep, margined by a strong annulate or 

 beaded rib; within the umbilicus are two high, nearly plain ribs ascending 

 from the aperture ; mouth circular, slightly varicose in the adult, rayed about 

 by the ends of the spiral ribs or keels (the figured specimen had not formed 

 its varix). Alt. of adult shell 4.2 ; max. diam. 5.5 mm. 



This species has relations with L. Bairdii Dall and L. variabilis Dall, of 

 the recent fauna, but is sufficiently distinguished from them by details of 

 sculpture, as well as by its constantly less elevated form. The first specimen 

 found, being unique, was figured, though not quite adult ; since then a number 

 of adult specimens have come to hand, on which the diagnosis is based, which 

 will explain some slight discrepancies between it and the figure. 



Liotia (Arene) gemma Tuomey and Holmes. 



Trochui gemma T. & H , Pleioc. Fos. S C, p. 118, pi. 26, fig. 4, 1856. 

 Archi'ectonica tiica'inataSVeAvn^, Proc. Bost. Soc. Nat. Hist, for 1872, p. 23, Jan , 1872. 

 Liotia tricarmaia Dall, Rep. Blake Gastr., p. 389, 1S89. 



Margarita tricarwata Gabb, Geol. Santo Domingo, p. 243, 1873 ; Journ. Acad. Nat. Sci., 

 2d Ser., viii. p. 366, pi. 46, f. 64, 1881. 



Miocene of Santo Domingo, Gabb, and of the Peedee River, S. Carolina, 

 Tuomey ; Pliocene of Costa Rica, Gabb ; of the Caloosahatchie beds and Shell 

 Creek, Florida, Dall and Willcox; of the Waccamaw beds of South Carolina, 

 Johnson; and living on the coast from North Carolina to Florida from low- 

 water-mark to 22 fathoms. 



There is no doubt of the practical identity of the recent and fossil shells, 

 though the Pliocene specimens are a little larger than the recent ones. Except 

 in the matter of size, they are indistinguishable and vary through the same 

 series of mutations. The names applied by Gabb and Stearns were given 

 independently of each other, Stearns describing the recent shell and Gabb 

 the Antillean fossil. Guppy queries * whether Gabb's shell is not identical 

 with Cyclostreina bicarinatiim Guppy and Adeorbis carinata Gabb, but these 

 species are quite distinct from each other, the latter being an Episcy?iia 

 resembling V. {£.) inornata Orb. 



Liotia (Arene) agenea n, s. 

 Plate 23, figure 3. 

 Older Miocene of the Chipola beds, Calhoun Co., Florida, Burns. 

 Shell small, with four whorls, the whorls tricarinate, the umbilicus wide, 

 rapidly narrowing, funicular, the outer margin bordered by a crenate rib ; 

 suture distinct ; transverse sculpture of fine, elevated, close-set lines, which are 

 usually a little gathered up, close to the suture, into short wrinkles ; aperture 

 nearly circular, slightly thickened, the outer margin angulate from the ends of 

 the keels. Alt. 2.0; max. diam. 2.5 mm. 



•Quart. Journ. Geol. Soc. 1874, p. 529. 



