GASTEROPODA. CARYCHIAD. 97 
1. IAMINIA BIDENTATA. 
I. testa levi, anfractibus (ultimo excepto) planis, apertura pos- 
tice ad sinistram biplicata. 
Voluta bidentata, Mont. Test. Brit. Supp. 100. pl. 30. fig. 2; 
Flem. Edinb. Encyel. vii. 83; Dill. Dese. Cat. 507; Turt. 
Conch. Dict. 253. 
Habitat in Danmonie estuariis et in ‘Freto Forth dicto,” 
rarior. 
Shell white, smooth, with all the whorls, excepting the last, 
flat ; left side of the aperture behind, with two folds. Height 
rather more than one quarter of an inch. 
“‘ Animal whitish, or pale cinereous. Tentacula short, cylin- 
dric, externally blackish. Eyes very black.””—Cranch. 
Inhabits the mouth of the river, near Bantham ; the Kings- 
bridge Estuary ; and Mill Bay ; it “has been found also in the 
Frith of Forth, near the Bass Rock’ (Rawlins) ; and at Wey- 
mouth and Tenby by the Provost of Eton. 
Genus 43. ALEXIA. 
Testa acuminato-turrita, ad apicem mamillata. Apertura 
ad sinistram rotundata, ad dextram acuminata. Peritrema 
interné marginatum ; posticé nullum. Umbilicus apertus. 
Shell acuminately-turrited ; its apex mamillated. Left side 
of the aperture rounded ; the right side acuminate. Peritreme 
margined internally ; wanting behind. Umbilicus open. 
This genus, as well as Jaminia, in the adult state, has no 
divisions in the upper part of its spire. 
1. ALEXIA DENTICULATA. 
A. testa anfractibus plano-convexis, transversim striolatis, sub- 
nitidis ; apertura posticé 4-plicata, anticé tuberculata. 
Voluta denticulata, Mont. Test. Brit. 234; M. §& R. Trans. 
Linn. Soc. vii. 130; Flem. Edinb. Encycl. vii. 83; Dill. 
Desc. Cat. 506 ; Turt. Conch. Dict. 249? 
Voluta ringens, Turt. Conch. Dict. 250. 
Habitat in estuariis. 
Shell pellucid horn-coloured, the whorls plano-convex, rather 
F 
