liv PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



previously supposed to be extinct. Of the 67 known living species, 

 there are : — 



Species living in the North Atlantic and Arctic seas 51 



Species living in the Mediterranean 11 



Species living in the Gulf of Mexico 2 



Species living in the Japanese seas 3 



67 



Among these 67 species, 45 were known as fossil also in the 

 Pliocene beds of Italy and Sicily or in our Crag. 



Fossil in Italy and Sicily 25 



Fossil in the Crag 20 



45 



Of the 19 species which had hitherto been known only in a fossil 

 state, I give, with Mr. Jeffreys's assistance, the list in full, for the 

 purpose of showing their geological range and position. 



List of Mollusca Tcnown hitherto as Fossil only, and now discovered to 



he living in the depths of the Atlantic. 

 Depths dredged *. Species. Locality where found fossil. 



feet. 



1932 to 2184. Cancellaria mitrseformis. 



1932 to 2184. subangulosa. 



5694. Cylichna ovata. 



1542 to 4140. Leda obtusa. 



4308, pusio. 



1752 to 2244. Limopsis minuta. 



4308. pygmEea. 



1680 to 1824. Odostomia plicatula. 



3600 to 6570. Omphalius monocingulatus. 



1642 to 4140. Pleurotoma decussata. 



4140. E-hynchonella sicula. 



1542 to 4140. Rissoa subsoluta. 



3600 to 6570. Scalaria frondosa. 



3600 to 6570. Siphonodentalium coarctatum. 



3600 to 6570. Trachysma delicatum. 



1680 to 1824. Trochus crispulus, 



1542 to 4140. reticulatus. 



2148 to 4302. suturalis. 



3402. Turbo fflosus. 



Italy and Coralline Crag. 

 Coralline Crag. 

 Sicily and Coralline Crag. 

 Sicily and Calabria. 

 Calabria. 

 Sicily. 

 Sicily. 

 Italy. 

 Sicily. 



Calabria, Sicily, and Coral- 

 line Crag. 

 Sicily. 



Sicily and Calabria. 

 Italy and Coralline Crag. 

 Italy. 

 Sicily. 

 Sicily. 



Sicily and Calabria. 

 Sicily and Calabria. 

 Calabria. 



* Other species of mollusca continued to be dredged down to depths of 

 14610 feet. 



