66 MANUAL OF THE MOLLUSCA. 
number of new furms as yet only known in the Mediterranean ; 
and a few accessions (about 30) of a different character from the 
Red Sea. The total number of shell-bearing species is esti- 
mated at 600, viz. :— 
Cephalopoda ........0 see aL Nucleobranchiata ... 6 Lamellibranchiata ......200 
PleCTOPOda .ccccccceecesessee LO GasteropOda ves... 370 Brachiopoda ......seeceeses 10 
On the coast of Sicily, M. Philippi has found altogether 619 
marine mollusca, viz. :— 
LOHTGIAYES) sosnnagesocnoosocononl lets} Pteropoda ............ 13 Gastropoda vecseesosseneedL9 
Brachiopoda .........008 lO Nudibranchs ......... 54 Cephalopoda ...cscrcscoeeee 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 lying 
on those coasts ; a few of them are living in the warmer regions 
of Senegal, the Red 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 agelutinans. 
Trochus strigosus. Niso terebellum., 
Pecten medius. 
Diplodonta apicalis. 
Most of them, however, are of northern origin, such as:— 
Saxicava rugosa. Tellina crassa. Rhynchonella psittacea. 
(Panopeea) Norvegica. Cyprina Islandica. Patella vulgata. 
Mya truncata, Leda pygmza. Eulimella Scille. 
Periploma preetenuis. Limopsis pygmea. Buccinum undatum. 
Lutraria solenoides, Ostrea edulis. 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 trwnculus, are com- 
mon to the Red Sea; Crania ringens cannot be distinguished 
froin the species found in New South Wales (Davidson); and 
Columbella corniculum ranges from the north coast of Spain to 
Australia, the specimens from these distant localities being only 
distinguishable as geographical varieties. (Gaskoin.) Six other 
species are included in Menke’s Australian Catalogue, but re- 
quire verification. 
The following genera, nine of which are naked molluses, are 
