PERI STERN IA. 79 



ance with their relationships, I have mainly followed this ar- 

 rangement, although it is certainly far from perfect. The 

 difficulty is, that whilst the genera hold good in a general way 

 as roughly indicating several great groups of species, there are 

 species which unite these characters in such manner that to ar- 

 range them in either group does violence to some of their 

 affinities. 



Besides Kobelt, Kiener and Reeve have monographed these 

 shells the work of Kobelt being the most complete, and con- 

 taining most of the species which I shall here describe and 

 figure. 



(lenus PERISTEENIA, Morch. 



P. PICTA, Reeve. PL 64, fig, 39. 



White, more or less completely covered with chestnut, or 

 chestnut and orange narrow revolving lines ; columella and in- 

 terior of aperture blush color. Length, 1-1-25 inches. 



Viti Isles. 

 P. BELCHERI, Reeve. PI. 64, fig. 40. 



White, with dark chocolate or blackish longitudinal flames or 

 blotches, and revolving bands ; epidermis light yellow ; aperture 

 white within. 



Cargados Garajos, Indian Ocean ; on coral. Liukiu Is. 



Very closely allied to the preceding species. 



P. AUSTRALIENSIS, Reeve. PL 64, fig. 41. 



White, ornamented between the ribs by dark chocolate square 

 blotches ; aperture yellowish, with two interrupted bold brown 

 bands. Length, 1-25 inches. 



Port Essington, Australia. 



P. PHILBERTI, Recluz. PL 64, fig. 42. 



Chocolate-brown, variegated and banded with white ; aperture 

 white or purplish within. Length, 1-25 inches. 



Philippines. 

 P. LOBBECKEI, Kobelt. PL 64, fig. 43. 



White, base dark chocolate, with three more or less interrupted 

 brown bands ; aperture rosaceous, columella stained with black. 



Length, 1 inch. 



Polynesia. 



