PROSOPHTIIALMA. 313 



Species of Acicula. 



fusca, Walker. Simoniana, Charp. 



gracilis, Loire. spectabilis, Rossm. 



polita, Pfeiff. striata, Quoy and Gaim. 

 producta, Lowe. 



Genus TOMICHIA, Benson. 



Tentacles tapering, with the eyes on tubercles on their 

 upper bases. 



Operculum horny, sub-spiral. 



Shell perforate; spire elongated, apex usually truncate, 

 whorls covered with an olivaceous epidermis; aperture 

 oblique, elliptic-oval, vertical; peristome double or triple, 

 continuous, the left margin expanded, rather reflexed, 

 slightly emarginate. 



Ex. T. ventricosa, Sowerhy, pi. 88, fig. 4. Operculum, 

 T. ventricosa, fig. 4, a, 4, b. 



The animal has a short, ovate foot, lobed at the sides in 

 front, and the eyes, according to the observations of Benson, 

 are placed on tubercles on the upper bases of the tentacles ; 

 it is a native of India. 



Sub-order PROSOPHTHALMA. 



Eyes on the middle of the tentacles near their tips. Foot 

 moderate, flat. 



Operculum horny, sub-spiral. 



The position of the eyes in this division differs materially 

 from that in the two former sub-orders, being placed neither 

 on the hind bases of the tentacles, nor at their outer sides ; 



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