a 
564 MOLLUSCA. 
Tornatellina cubensis, Pfeiffer, Monogr. Helic. 1. p. 891 (1848) °. 
Blauneria pellucida, Pfeiffer, Monogr. Auric. p. 153 (1856)"; Catal. Auric. Brit. Mus. p. 110°; 
H. & A. Adams, Gen. Recent Moll. ii. p. 643, t. 138. fig. 8°; Binney, Land and Freshw. 
Shells of N. Am. ii. p. 21, fig. 22°°; Tryon, Am. Journ. Conch. iv. p. 10, t. 1. fig. 13”. 
Conoidal-elongate, polished, white. 
Long. 5, diam. 13; apert. long. 2 millim. 
Hab. Yucatan: Sisal (Morelet +). 
Also inhabits Florida 7° 101! (Hemphill®) and the West Indies—Cuba (Pfeiffer °78), 
Jamaica (C. B. Adams‘ *®), Haiti (Sallé+), Puerto Rico (Blauner*), Guadaloupe 
(Schramm *). 
Very little is known of the habits of this species, the dead shell being usually found 
among other small mollusks drifted on sandy beaches. It has been recorded from 
Dunbar ! *, on the British coast, where it was probably introduced with ballast®. Dall® 
notes that Mr. Hemphill met with it at Mareé, Florida, in damp moss, in a dried-up 
brackish swamp. . 
Fam. TRUNCATELLIDZ. 
TRUNCATELLA. 
Truncatella, Risso, Hist. Nat. de l'Europe mérid. iv. p. 124 (1826); H. & A. Adams, Gen. Recent 
Moll. ii. p. 810; Pfeiffer, Monogr. Auric., App. ii. p. 181, &c. 
Shell of small size, when full-grown cylindrical, consisting of 3-5 whorls only ; 
upper end blunt, truncated, and cicatrized ; aperture perpendicular, suboval or elliptical, 
with continuous thickened and somewhat expanded peristome. Sculpture consisting 
of small longitudinal ribs, which are often more distinct in the upper whorls and more 
or less feeble and disappearing in the last. Young shells turrited, with more whorls, 
pointed at the upper end, with thin sharp peristome. Operculum thin, with basal 
spiral nucleus. Feelers short, blunt ; eyes behind them on the surface of the head, as 
in the Auriculide ; snout bilobate. Foot rounded at both ends. The animal crawls 
by fixing alternately the further or the hinder part of the foot, in the same manner as 
the larva of a Geometrid moth. 
Generally distributed in temperate and tropical regions. ‘The various species live 
in places reached by the tide, on stones and seaweed, and are able to live many weeks 
out of the water. 
The throwing-off of the upper whorls is as regular in this genus as it is in Rumina 
decollata, L., in Southern Europe, or in some species of Potamides; among 400 
specimens of 7’. bairdiana collected by C. B. Adams at Panama, there was only a single 
full-grown one which hid preserved its upper whorls, and these were bleached and 
cretaceous, as if decayed. 
