GASTEROPODA. 263 



Family IX. — Tuebintd^.. 



Shell spiral, turbinated or pyramidal, nacreoTi-s inside ; oper- 

 culum calcareous and pauci-spiral, or horny and multi-spiral. 



Animal with, a short muzzle; eyes pedunculated at the outer 

 bases of the long and slender tentacles ; head and sides orna- 

 mented with fringed lobes and tentacular filaments [cirri) ; 

 branchial plume single ; lingual ribbon long and linear, chiefly 

 Contained in the visceral cavity ; median teeth broad ; laterals 

 5, denticulated ; uncini very numerous (sometimes nearly 100), 

 slender, with hooked points (Fig. 15, A). 



Marine, feeding on sea-weeds {ahjce). 



The shells of nearly all the turbinidse are brilliantly pearly 

 when the epidermis and outer layer of shell are removed ; many 

 of them are used in this state for ornamental purposes. 



TuEBO, L. Top-shell. 



Etymology, turho, a whipping-top. 



Synonyms, Batillus, Marmorostoma, Callopoma, &c. — Gray. 



Type, T. marmoratus, PL X., Fig. 2. 



Shell turbinated, solid ; whorls convex, often grooved or 

 tuberculated ; aperture large, rounded, slightly produced in 

 front ; operculum shelly and solid, callous outside, and smooth, 

 or variously grooved and mammillated, internally horny and 

 pauci-spiral. In T. sarmaticus the exterior of the operculum is 

 botryoidal, like some of the tufaceous deposits of petrifying 

 wells. 



Animal with pectinated head-lobes. 



JDistrihution, 60 species. Tropical seas, West Indies, Medi- 

 terranean, C'^.pe, India, China, Australia, New Zealand, Pacific, 

 Peru. 



Fossil, 360 species (including littorina) L. Silmian — . 

 ITniversal. 



Phasianella, Lam. Pheasant-shell. 



Synonyms, Eutropia (Humphrey), Gray. Tricolea, Pisso. 



Tijpe, P. australis. PL X., Fig. 3. 



Shell elongated, polished, richly coloured; whorls convex; 

 aperture oval, not pearly ; inner lip callous, outer thin ; oper- 

 culum shelly, callous outside, sub-spiral inside. 



Anim,al with long ciliated tentacles ; head-lobes pectinated, 

 wanting in the minute species; neck-lobes fringed; sides 

 ornamented with three cirri ; branchial plume long, partly 

 free ; foot rounded in front, pointed behind ; its sides moved 

 alternately in walking ; lingual teeth even-edged ; laterals 5, 



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