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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Apr. 24, 



No. Species. Remarks on the comparative 



frequency, &c. 



Univalves. 



Fusus anti<pius,var.sinistrorsus One specimen, exactly resembling the 



common Crag shells. It is very rare 

 as recent or living in these seas. 



20. Lacuna crassior Very rare. 



21. vincta Several specimens. One of them is of 



unusually large size. 



22. Littorina littorea There is only one specimen which I can 



refer to this species, and that is not 

 perfect. 



23. rudis Only one small specimen. 



*24. squalida, Broil. Soiv. Rather common. An Arctic form. It 



is the same species as occurs in the 

 newer Crag strata. Intermediate be- 

 tween L. littorea and L. rudis. Pro- 

 bably the L. limata of Loven. 

 25. Mangelia nebula Three imperfect specimens. 



*26. pyramidalis, Strom. Two young specimens. A Norwegian 



species. 



27. turricula Several specimens. 



28. Murex erinaceus A fragment. Neither this, nor Mem- 



gelia nebula, is known to me as an 

 arctic species. 



29. Nassa reticulata Frequent. 



, var. scala- I ^ 



riformis ( specimen. 



*30. Natica clausa, Broil. § Sow. . . A few specimens ; one is very large. 



A northern species. 



31. Groenlandica, Beck . . Three specimens — one large — and a 



(pusilla, F. <5" H.) fragment of another still lai'ger. It 

 survives on the Doggerbank. 



32. helicoides Rare. Found living with the last on 



the Doggerbank. 



33. nitida Not common. 



34. Purpura lapillus Very abundant. 



35. Rissoa labiosa .- A fragment. 



*36. subumbilicata, Mont. Two imperfect specimens. An estua- 



rine species, allied to R. ulvce, of 

 which it may be only a variety. 



37. Trophon clathratum A. few specimens, of large size. 



*38. Gunneri, Loven .... Two specimens ; Norwegian. 



*39. scalariforme, Gould Two specimens ; northern. 



40. Turritella communis Two fragments. 



Cirrhiped. 



Balanus crenatus, Bruguiere . Detached valves are rather common. 



Although nearly all of the species comprised in the foregoing list 

 still exist in the German Ocean, there are some which are only known 

 as living in more northern seas. 



Mr. Jeffreys further observes, " The conditions of coast and sea- 

 bottom which produced these animals appear to have been as follows. 



" 1st. A muddy estuary, like the Solent, into and out of which 

 a large river flowed, and in which grew the Zostera marina : this 



