228 MANUAL OF THE MOLLUSCA. 



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

 tralia, Pacific. 



Fossil) 21 species. Eocene — . Britain, France, «S:c. 



Family IV. — CoJfiD.^;, Cones. 



Shell inversely conical; aperture long and 

 narrow ; outer lip notched at or near the suture ; 

 operculum minute, lamellar. 



Animal foot oblong, truncated in front ; with a 

 conspicuous (aquiferous ?) pore in the middle. Head 

 produced. Tentacles far apart. Eyes on the ten- 

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

 elongate, subulate, or hastate. 



CoNUS, L. Cone-shell 



Types, C. marmoreus, PL YII., 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. 



Distribution, 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 ( C. aulicus) bite when handled ; they are all predatory. 

 (Adams.) 



Sub-genus Conorbis, Sw. C. dormitor, PI. VII., Fig. 2. 

 Eocene — . Britain, France. 



Pleurotoma, Lam. 



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



Synonym, Turris, Humphrey. 



Tijpes, P. Babylonica, PI. VII., Fig. 3. P. mitrseformis, &c. 



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

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

 apical. 



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

 1*7; Mediterranean, 19; Africa, 15; Rod Sea and India, 6; 

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



* Fig. 88. Lingual teeth of Bela turncula (after Lovtu). 



