MAEINE BIOLOGICAL STATION AT POET EEIN. 67 



These 41 species added to the 99 species from the same 

 haul noted on p. 64 and to the following 16 species 

 recorded from the trawl on Oct. 27th, when the haul was 

 taken, make in all 156 species : — Mytilus modiolus, Pecten 

 tigrinus, Trochus zizijphinus, Fissurella grceca, Eulima 

 polita, Pagurus prideauxii, Ophiothrix fragilis, Opliicoma 

 nigra, Adamsia palliata, Sertidaria abietina, Antennu- 

 laria ramosa, Hijdrallmania falcata, Tubidaria, sp., 

 Glycera, sp., Amphiporus pidcher, Flustra foliacea. It 

 ought to be remembered, however, that a good many (by 

 no means all) of the Mollusca and a few of the Polyzoa 

 were dead. 



Mr. Clement Eeid, F.G.S., of the Geological Survey, 

 has examined the samples of deposits which were sent by 

 us to the Jermyn Street Museum, and reports as follows : — 



" The series of dredgings examined since the last report 

 is most interesting from a geological point of view. One 

 is again struck by the common occurrence of loose angular 

 stones at places and depths apparently well beyond the 

 reach of any bottom drift — at least beyond the reach of 

 currents likely to move such coarse material. This stony 

 sea-bed is in all probability the result of submarine erosion 

 of glacial deposits. Its occurrence renders comparison 

 between recent marine deposits of these latitudes and 

 Tertiary deposits a task of peculiar difficulty ; for not only 

 is the nature of the true marine sediments masked, but 

 the fauna also must be greatly altered. It is evident that 

 numerous species which need a firm base on which to 

 affix themselves will be encouraged by a stony bottom ; 

 while in a Tertiary deposit, formed under identical 

 conditions, except for Hie absence of stones, febey may be 



