10 TESTACELLA. 



T. HALTOTIDEA, Drap. PL 1, figs. 23-28, 29-31, 35, 36. 



Shell oval-auriform, depressed, rugosely striate, with a thin, 

 readily deciduous epidermis ; apex minute, very short, not 

 separated from the columellar margin; aperture rounded, 

 usually dilated anteriorly ; columella and outer margin forming 

 a distinct angle at their junction ; interior whitish pearly. 



Length, 6-10 mill. 



Western Europe, Algiers, Madeira, Canaries ; 

 var. trigona at Havana. 



This is T. Europsea, Koissy, T. Galliee, Oken. The above 

 description is of the typical form ; there are several varieties, 

 some of which differ from it as much as do some of the 

 preceding so-called species from T. bisulcata. 



The Yars. as enumerated l>y Pfeiffer are : Yar. major ; Yar. 

 elongata; Yar. scutulum, Sowb. (figs. 29-31), of which T. Anglica, 

 Grat., is a synonym; Yar. albina ; Yar. trigona, Gassies and 

 Fischer (figs. 35, 36), inhabiting (introduced) Havana. 



T. SERVAINI, Massot. PI. 1, figs. 32-34. 



Small, ear-shaped, oblong, thin ; distinctly striate and light 

 corneous above ; apex smooth, very minute, not prominent, ap- 

 proximating the columellar margin ; columellar margin curved, 

 dilated above, deflexed, attenuated and not truncate below. 



Length, 4'5 mill. 



" La Preste," Eastern Pyrenees. 



T. DRYMONIA, Bourg. PI. 1, figs. 37, 38. 



Trigonal, pellucid, concentrically striate and corneous above; 

 apex minute, strongly recurved, separated from the columella ; 

 columellar margin broad above, attenuating below. Length, 7 mill 



Isle of Capri, Bay of Naples. 

 It is T. haliotidea, Costa. 



T. BRONDELT, Bourg. PL 1, figs. 39, 40. 



Shell small, trigonal-ovate, convex and concentrically rugose 

 above, pellucid ; spire very small, smooth, recurved, adhering to 

 the columella ; aperture rounded below, dilated above ; columella 

 white, twisted, curved, deflected, not reaching the base of the 

 aperture nor truncate. Length, 4 mill. 



Around Bona, Algiers. 



Too closely allied to the preceding species. 



