294 MANUAL OF THE MOLLUSCA. 



Shell slender, usually sinistral, fusiform, multispiral, aperture 

 ovate ; peristome acute, margins unequal, wall of the aperture 

 ■with, one single plait ; columella simple. 



Animal snail-like ; teeth 20.20 ; rows 130. (Thomson.) 



Distribution, 8 species. Norway, Hungary, New Granada, 

 Tristan d'Acunha. The British species is found, very rarely, in 

 Porto Santo, only on the highest peak, at an elevation of 1,665 

 feet. (WoUaston.) 



Fossil, 1 species. Eocene. 



Sub-genus. Megaspira (elatior). Lea, PI. XII., Fig. 18. 



Shell dextral, with the columella transversely plaited. 



Distribution, 1 species. Brazil. 



Fossil, 1 species. Eocene — . Eheims. 



ToENATELLiNA, Beck. > 



Etymology, diminutive (or patronymic termination) of torna- 

 tella. 



Type, T. bilamellata. Ant. 



Synonyms, Strobilus, Anton. Elasmatina, Petit, 



Shell imperforate, ovate or elongated ; aperture semi-lunar, 

 margins unequal, disunited ; columella twisted, truncated ; 

 inner lip 1 -plaited. 



Distribution, 27 species. Cuba, South America, Juan Fer" 

 nandez, Pacific Islands, New Zealand. 



Paxilltjs, a. Adams. 



Type, P. adversus, Ad. Borneo. 



Shell small, pupiform, sinistral, rimate ; spire pointed ; aper- 

 ture semi-ovate, ascending on the body- whorl ; inner lip 

 spreading, 1 -plaited, outer lip expanded, notched in front. 



Clatjsilia, Draparnaud. 



Etymology, Diminutive of clausum, a closed place, 



Synonym, Cochlodina, Fer. 



Example, C. plicatula, Draparnaud (=C. Eolphii, Leach), 

 PI. XII., Fig. 19. 



Shell fasiform, sinistral ; aperture elliptical or pyriform, con- 

 tracted by lamellae, and closed when adult by a movable shelly 

 plate {clausiwn) in the neck. 



Animal with a short, obtuse foot ; upper tentacles short, lower 

 very small. G. bidens has 120 rows of 50 teeth ; 0. nigricans 

 90 rows of 40 teeth each. 



Distribution, 386 species. Europe, Asia, Africa, and South 

 America. 



