TURRITINiE, 87 



Fani. TURRITTDiE. 



Teeth on lingual membrane in two lateral series (I'O"!), 

 elongate, subulate. Mantle with a slit in the hinder part 

 of the right side; siphon straight. 



Operculum hornj, annular. 



Shell turreted, subfusiform ; aperture with the fore part 

 channelled, straight, and often much produced ; outer lip 

 detached at the hind part from the body whorl, forming a 

 sinus, or with the margin fissured near the last whorl. 



Sub-fam. TURRITIN^. 

 Operculum ovate, acute, nucleus apical. 



Genus TURRIS, Humphrey. 



Tentacles wide apart; eyes at their outer bases. 



Shell turreted, fusiform ; spire elevated ; aperture oval ; 

 canal long and straight ; columella smooth ; outer lip 

 notched anteriorly, and with a deep slit near the suture. 



Syn. Pleurotomus, Montf. Pleurotoma, Lam. Pleu- 

 rotomarius, Duni. 



Ex. T. Babylonius, Linnaus, pi. 10, fig. 1, Operculum, 

 T. Babylonius, fig. 1, «, 1 5. Shell, T. Babylonius, fig. 1, c. 



The species of this genus are found in all parts of the 

 world, being, however, most numerous in the countries of 

 Asia ; they are met with from low-water mark to one 

 hundred fathoms. 



