158 PLEUROTOMID^E. 



Foot short, broad, rounded behind ; eyes near the tips of the 

 tentacles. Dentition (1-1-1), PL 33, fig. 58. 



Supposed to be a fluviatile species, allied to Melanopsis, which 

 it superficially resembles, the marine habitat and family relations 

 of Clionella were first pointed out by Stimpson (Am. Jour. Sci., 

 3d ser., xxxviii, 48 ; Am. Jour. Conch., i, 62). He unnecessarily 

 made a new family, Clionellidse, for it, and for the slightly 

 different type of dentition proposed Tomoglossata. 



Genus PUSIONELLA, Gray, 1847. 



Shell fusiform, solid, smooth, shining; whorls numerous ; spire 

 sharp ; lip without sinus ; canal short, exteriorly carinated at 

 the base ; columella twisted anteriorly. Operculum with lateral 

 nucleus. 



Eyes at the external bases of the tentacles. W. Coast of 

 Africa. 



The smooth shining whorls and form of the spire resemble 

 Terebra, but the body-whorl is proportionally larger and wider 

 than in that genus, and more contracted below, and the spire is 

 much shorter. Differs from Terebra also in the position of the 

 eyes, which are terminal in the latter. It may readily be dis- 

 tinguished from Clavatula by its smooth surface and the absence 

 of a sinus of the lip. 



Genus SURCULA, H. and A. Adams, 1853. 



Shell turriculated, fusiform ; spire long ; lip-sinus in the 

 infrasutural depression above the peripheral carina ; canal long, 

 slightly bent. Operculum with medio-lateral nucleus. 



Animal with eyes at the base of the tentacles. Dentition 

 (1-0-1), PI. 33, fig. 59. 



Distr. Warm Eastern Seas. 



The tertian groups Clinura, Brocchi (Europe), and Surculites, 

 Conrad (United States), may be here included. 



III. Mangiliinse. 

 Genus MANGILIA, Risso, 1826. 



Dedicated to the Italian naturalist, Mangili. Not Mangelia, 

 as usually written. 



Shell fusiform, imperforate ; aperture oval-elongated, usually 



