228 MANTTAL OF THE MOLLTJSCA. 



Distrihutiony 23 species. Eed Sea, India, Madagascar, Aus- 

 tralia, Pacific. 

 Fossil, 21 species. Eocene — . Britain, France, &c. 



Family IV. — Conid^, Cones. 



Shell inversely conical; aperture long and 

 narrow ; outer lip notched at or near tlie suture ; 

 operculum minute, lamellar. 



Animal foot oblong, truncated in front ; Tvitli a 

 conspicuous (aquiferous ?) pore in the middle. Head 

 produced. Tentacles far apart. Eyes on the ten- 

 tacles. Gills 2. Lingual teeth (uncini?) in pairs, 

 Fig. 88.* elongate, subulate, or hastate. 



CoNTJS, L. Cone-shell 



Types, C. marmoreus, PI. YIL, Fig. 1. C. geographicus, 

 antediluvianus, &c. 



Shell conical, tapering regularly ; spire short, many-whorled ; 

 columella smooth, truncated in front ; outer lip notched at the 

 suture ; operculum pointed, nucleus apical. 



Distrihution, 371 species. All tropical seas. 



Fossil, 84 species. Chalk — . Britain, France, India, Java, &c. 



The cones range northward as far as the Mediterranean, and 

 southward to the Cape ; but are most abundant and varied in 

 equatorial seas. They inhabit fissures and holes of rocks, and 

 the warm and shallow pools inside coral-reefs, ranging from 

 low water to 30 and 40 fathoms ; they move slowly, and some- 

 times ( Q. aulicus) bite when handled ; they are all predatory. 

 (Adams.) 



Sub-genus Conorbis, Sw. 0. dormitor, PI. YIL, Fig. 2. 

 Eocene — . Britain, France. 



Pletjhotoma, Lam. 



Etymology, pleura, the side, and toma, a notch. 



Synonym, Turris, Humphrey. 



Types, P. Babylonica, PL YIL, Fig. 3. P. mitraeformis, &c. 



Shell fusiform, spire elevated ; canal long and straight ; outer 

 lip with a deep slit near the suture. Operculum pointed, nucleus 

 apical. 



Distrihution, 430 species. World-wide. Greenland, Britain, 

 17 ; Mediterranean, 19 ; Africa, 15 ; Eed Sea and India, 6 ; 

 China, 90 ; Australia, 15 ; Pacific, ? West America, 52 ; West 



• Pig. 88. Lingual teeth of Bela turricula (after Loven). 



