116 



LUSITANIAN PROVINCE. 



except Trochus lineaius (doubtfully determined) 

 and Trochus umbilicatus, such as range into the Me- 

 diterranean, and many of them are found only on 

 the southern shores of Britain. These were taken 

 in shallow water, within the littoral and laminarian 

 zones. The record of a dredge off Cape St. Maria, 

 in the neighbourhood of the same locality, shows 

 the character of the molluscan fauna of the coralline 

 zone, having been worked in between 15 and 30 

 fathoms, on a bottom of coarse sand, and, in places, 

 of mud. Out of 83 species enumerated, 59 are 

 British, but the same remark applies to them as 

 to those just mentioned from Faro. Among the 

 remainder a few of the most striking may be speci- 

 fied : Tellina distorta and costce, Cytherea venetiana, 

 Cardita trapezia, Lucina digitalis and divaricata, 

 Mytilus afer, Leda emarginata, Pecten polymor- 

 phic, Natica sagra ? Turritella sulcata, Buccinum 

 modestum, and Ringuicula auriculata. In the record 

 of a dredge in 30 fathoms, eight miles or more from 

 shore between Cadiz and Cape Trafalgar, we find 

 a Vermetus and Fusus corneus (i. e. lignarius) 

 taken, and the large red Omlina coral. Out of 

 265 species of estacea obtained in the Bay of 

 Gibraltar, 135 are British species. In this list we 

 find species of the genera Solemya, Mesodesma, 

 Cardita, Bomia (as distinguished from Kellia), 

 Siphonaria, Vermetus, Solarium, Turbo, Cancel- 

 laria, Ranella, Triton, Cassis, Columbella, Rin- 



