Manchester Memoirs, Vol. xlii. (1898), No. 13. 11 



of this genus, of which the North Atlantic yielded three, 

 from depths varying from 51-400 fath. 



The South Atlantic yielded 9 species, 5-600 fath. 

 „ Kerguelen region „ 6 ,, 20-500 „ 

 ,. Australian „ ,,12 „ 2-40 „ 

 (One species, an aberrant form, doubtfully referred to this 

 genus, was found in 2,600 fath.). 



The North Pacific region, 4 species, 10-30 fath. 

 „ South „ „ 2 „ one from 45 



fath., the other from 1,325 fath. 

 The genus is cosmopolitan, and appears to belong to 

 shallow water, yet evidence shows that it has a wide 

 bathymetrical range. 



Cribrilina. This genus inhabits north and south tem- 

 perate regions, but only one species {^C. floridand) has 

 been recorded from the tropics (Gulf of Florida). The 

 genus is fossil, occurring in the French cretaceous, Austro- 

 Hungarian miocene (coral and red crag), Italian pliocene, 

 boulder clay (Wick). 



The species C. monoceros is notable in that it occurs 

 in very shallow as well as in very deep water. Off the west 

 coast of the extreme south of South America it has been 

 found at a depth of 1,325 fath., in the North Pacific at a 

 depth of 3,125 fath.. Strait of Magellan 25 fath., Tierra del 

 Fuego and Patagonia 19 fath.. Cape Horn 40 fath., Falk- 

 lands 4-12 fath. My specimens were picked up on the 

 beach. The facts of its occurring in the tertiary deposits, its 

 presence in the north and south temperate regions, and 

 its absence from the tropics, tend to support Murray's 

 argument, according to which Cribrilina may be looked 

 upon as a true representative of a primitive, universal, 

 marine, littoral fauna. 



On the other hand — and this is supported by the fact 

 that this species does occur in very deep water elsewhere — 



