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 known hitherto as Fossil only, and now discovered to be living in the depths of the Atlantic.
Depths dredged *. Species. Locality where found fossil. feet.
1932 to 2184. Cancellaria mitraeformis. Italy and Coralline Crag.
1932 to 2184. — subangulosa. Coralline Crag.
5694. Cylichna ovata. Sicily and Coralline Crag.
1542 to 4140. Leda obtusa. Sicily and Calabria.
4308. — pusio. Calabria.
1752 to 2244. Limopsis minuta. Sicily.
4308. — pygmaea. Sicily.
1680 to 1824. Odostomia plicatula. Italy.
3600 to 6570. Omphalius monocingulatus. Sicily.
1542 to 4140. Pleurotoma decussata. Calabria, Sicily, and Coralline Crag.
4140. Rhynchonella sicula. Sicily.
1542 to 4140. Rissoa subsoluta. Sicily and Calabria.
3600 to 6570. Scalaria frondosa. Italy and Coralline Crag.
3600 to 6570. Siphonodentalium coarctatum. Italy.
3600 to 6570. Trachysma delicatum. Sicily.
1680 to 1824. Trochus crispulus. Sicily.
1542 to 4140. — reticulatus. Sicily and Calabria.
2148 to 4302. — suturalis. Sicily and Calabria.
3402. Turbo filosus. Calabria.
- Other species of mollusca continued to be dredged down to depths of
14610 feet.
