66 MANTIAL OF THE MOLLUSCA. 



number of new forms as yet only known in tlie Mediterranean ; 

 and a few accessions (about 30) of a different cbaracter from tbe 

 Eed Sea. The total number of shell-bearing species is esti- 

 mated at 600, viz. : — 



Cephalopoda 1 NucleobrancMata ... 6 Lamellibranchiata 200 



Pteropoda 13 Gasteropoda 370 Brachiopoda 10 



On the coast of Sicily, M. Philippi has found altogether 619 

 marine mollusca, viz. : — 



Bivalves 188 Pteropoda 13 Gasteropoda 319 



Brachiopoda 10 Nudibranchs 54 Cephalopoda 15 



Of the 522 which are provided with shells, 162 have not been 

 found fossil, and are presumed to be of post- tertiary origin, so 

 far as concerns their presence in the Mediterranean. The re- 

 maining 360 occur fossil in the newer tertiary strata, along with 

 nearly 200 others which are either extinct or not known living 

 on those coasts ; a few of them are living in the warmer regions 

 of Senegal, the Eed Sea, and the West Indies : — 



Senegal. Antilles. Red Sea. 



Lucina columbella. Lucina pennsylvanica. Argonauta hians. 



Cardium hians. Vermetus intortus. Dentalium elephantinum. 



Terebra fusca. Terebra duplicata. 



Morocco. Phorus agglutinans. 



Trochus strigosus. Niso terebellum. 



Pecten medius. 

 Diplodonta apicaUs. 



Most of them, however, are of northern origin, such as : — 



Saxicava rugosa Tellina crassa. Ehynchonella psittacea. 



(Panopasa) Norvegica. Cyprina Islandica. Patella vulgata. 



Mya tnmcata. Leda pygmaea. EuHmella Scillae. 



Periploma praetennis. Limopsis pygmsea. Buccinum undatum. 



Lutraria solenoides. Ostrea eduUs. Fusus contrarius. 



Of the 522 Sicilian testacea, about 35 (including 10 oceanic 

 species) are common to the West Indies — ^if the species have 

 been correctly determined ; 28 are stated, with more probability, 

 to be common to West Africa, including Murex Brandaris and 

 other common species ; *74, including Murex trunculus, are com- 

 mon to the E-ed Sea ; Crania ringens cannot be distinguished 

 from the species found in New South Wales {Davidson) ; and 

 Columhella corniculum ranges from the north coast of Spain to 

 Australia, the specimens from these distant localities being only 

 distinguishable as geographical varieties. [Gaskoin.) Six othei 

 species are included in Menke's Australian Catalogue, but re* 

 quire verification. 



The following genera, nine of which are naked molluscs, are 



