869 



The strictly literal species vary on each great line of coast : for example, 

 Litorina intermedia and Tectaria pagodus occur on the east coast of Africa; 

 Litorina conica and melanostomn, in the Bay of Bengal ; Litorina sinensis 

 and castanea, and Haliotis venusta, on the coast of China ; Litorina scabra 

 and H. sqitamata, in N. Australia; H. asinina, New Guinea; and L. picta. 

 at the Sandwich Islands. 



Red Sea (Erythrsean). 



Of the 408 mollusca of the Red Sea, collected by Ehrenberg and 

 Hemprich, 74 are common to the Medit. from which it would seem that 

 these seas have communicated since the first appearance of some existing 

 shells. Of the species common to the two seas 40 are Atlantic shells which 

 have migrated into the Red Sea by way of the Medit. probably during the 

 newer pliocene period ; the others are Indo-Pacific shells which extended their 

 range to the Mediterranean at an earlier age. 



The genera wanting in the Medit. but existing in the Red Sea, show 

 most strikingly their diversity of character, and the afldnity of the latter to 

 the Indian fauna. 



Other genera become abundant, such as Conus, of which there are 19 

 species in the Red Sea, Cijinaa 16, Mitra 10, Cerithium 17, Pinna 10, 

 Chama 5, Circe 10. 



