32 



It will be seen that the fauna of Mogador, as illustrated by the 

 preceding list, is generally identical with that of the Mediterranean and 

 southern peninsula, and that while a few (Marginella, Mitra zehina, a 

 Chiton, Columbella Broderippii, and a Turlo unnamed) are probably 

 natives of tropical Africa, and all but the last obtained in tlie Canaries ; 

 others, such as Tellina fabula, Lucina borealis, Patella pellucida, 

 Trochus crassus, &c., are typical of a more northern fauna than that of 

 the Mediterranean. 



About one-half the species range as far north as Britain, but of 22 

 of them dredged in 35 to 50 fathoms, (the remainder being littoral or 

 from shallow water,) all but 6 are well-known inhabitants of tlie British 

 seas. 



Canary Islands. 



Messrs. Webb and Berthelot, in their valuable work on the Natural 

 History of the Canary Islands, enumerate 124 species of Marine Tes- 

 taceous MoUusca. During a month that I passed in these Islands, in 

 1852, I procured the following : — 



ACEPHALA LaMELLIBRANCHIATA. 



Teredo 



Gastroclmoea cuneiformis 

 Saxicava arctica 

 Venerupis irus 

 Corbula nucleus 

 Neoera cuspidata 



„ costellata 

 Pandora obtusa 



„ rostrata ? 

 Tliracia pbaseolina 



„ pubescens 

 Solecurtus candidus 



„ coai'ctatus 



Solemya mediterranea 

 Psammobia vespertina 



„ costulata 



„ Ferroensis 



Tellina incamata 



,, distorta 



„ balaustina 



,, serrata 



Depth. 



shore 



2 to OO f. 

 12 to 40 f. 



shore 



10 fath. 

 20 to 35 f. 

 20 to 35 f. 

 12 to 40 f. 



12 fath. 

 12 to 60 f. 

 40 to 60 f. 

 12 to 40 f. 

 20 to 40 f. 



12 fath. 



12 fath. 

 30 to 60 f. 



30 fath. 

 sh.to 16 f. 

 12 to 00 f. 



25 fths. 

 12 to 40 f 



