e / 
26 CONCHOLOGY. 
Shell very thin, conical, tubular, involuted in a spiral manner, 
joosely and irregularly ; aperture circular, sharp edges, interrupted 
in the middle by a notch, extending like a slit through the greater 
portion of its length, and stopping abruptly at some distance from 
the summit. Inhabits the Indian seas. Eight species. 
Siliquaria anguina. Siliquaria rugosa. 
S. muricata. S. terebella. 
S. laevigata. S. lima. 
S. lactea. S. spinosa. 
FAMILY II. 
Matpanta. Two Genera. 
1. Genus Clymene. 
inimal. Respiratory organs not determined, suppesed to be 
at the posterior part of the body. 
Shell. Tube thin and slender, open at both ends, encrusted 
externally with sand and fragments of shells. One species. 
Clymene amphistoma. 
2. Genus Dentalium. Fl. V. 
Animal. Body elongated, conical, sub-vermiform, enveloped 
in a fistula mantle as far as the anterior third, and ending in a 
bourrelet pierced in its middle by an orifice with fringed edges ; 
foot altogether anterior, proboscidiform, terminated by a conical 
appendage, contained in a kind of cup with festooned edges ; head 
distinct, oval, with a terminal mouth in the middle of a digitated 
lip; a pair of lateral jaws, formed each of two little oval shells 
garnished with points. 
Shell. Tubular, regular, symmetrical, slightly curved longitu- 
dinally, tapering gradually to the rear, and opening in a round 
orifice at each end. Inhabits the British seas. Twenty-one 
species, 
Dentalium elephantinum. Dentalium pscudo-antalis. 
D. aprinum. D. radicula. 
D. sulcatum. D. antalis. 
D. fasciatum. D. arictinum. 
