IANTHINA. 37 



Tar. BRITANNICA, Leach. Figs. 100-2, 5-9. 



Shell a little more elevated than in the type, whorls more ex- 

 serted and more convex, darker colored. 



/. rotundata, Leach; /. grandis,' Reeve (fig. 2); perhaps I. 

 Smithise, Reeve (fig. 1 ) ; /. affinis, Reeve (fig. 6) ; /. fibula, 

 Reeve (fig. 5); /. roseola, Reeve (fig. 7); /. involuta, Reeve 

 (fig. 8), peculiar growth the result of an injury; /. Africana, 

 Reeve (fig. 9), are synonyms. 



Yar. TROCHOIDEA, Reeve. Fig. 10. 



Spire much more elevated, the whorls flatter. 



Zanzibar, Mauritius. 

 I. GLOBOSA, Swainson. PL 10, figs. 11-16. 



Thin, inflated, subglobose, spire short, somewhat immersed; 

 whorls rounded, outer lip a little sinuous in the middle, aperture 

 produced into a short open channel at the base. Light viola- 

 ceous, becoming a little darker towards the base. 



Diam. 1*5 inches. 



Mediterranean, Atlantic 0., Mazatlan, Mauritius, etc. 



The synonyms are I. prolongata and /. violacea, Blainv. ; 7. 

 nitens, Menke (fig. 11); J. communis, Costa, Chenu, Scacchi ; 

 1. elongata, Maravigna ; 7. splendens, Monts., and var. minor, 

 Monts. ; var. Atlantica, Morch ; /. decollata, Carp. (fig. 13) ; 

 /. nana, Gray ; I. iricolor, Reeve (fig. 14). 



Yar. PALLIDA, Harvey. Figs. 15, 16. 



Lower part of aperture broadly rounded, instead of being 



produced and subchanneled. 



Europe. 



Although usually considered a distinct species, this is rather 

 an occasional from of I. globosa than a variety. In a series 

 from the West Indies before me the intermediate apertures 

 make a connecting series. The synonyms are /. rosea, Anton ; 

 /. patula, Phil. ; var. minor, Monts. (= /. Iseta, Monts.) ; /. 

 striolata, Ads. and Reeve (fig. 16). 



I. EXTGUA, Lam. PI. 10, figs. 17-22. 



Conically turbinated, whorls a little flattened above, forming 

 an obtuse peripheral angle, spire not sunken at the sutures, sur- 

 face closely flexuously striate, corresponding with a deep per- 



