120 Analytical Notices. 



longo-ovata; margine integerrimo. 5th, AncA glacialis; testa 

 ovali-elliptica, tenui, villosa, alba, concentrice et transversim 

 striata; postice rotundata; umbonibus approximatis ; dentibus 

 sub-obsoletis ; margine integerrimo. 6th, Modiola lecvigata; 

 testa ovali-elliptica, convexa, Tirescens, antice obsolete costo- 

 striata, postice rotundata laevigata. 7th, Pecten vitreus ; testa 

 -orbicularis, tenuis, hyalina, planulata, laevissima, lucida, sub- 

 sequivalvis; auriculis subequalibus, laevibu?. 8th, Balanus glw- 

 cialis ; testa subcylindrica, obliqua, albida, obsolete transversim 

 striata ; operculo antice profundi transversim sulcato, postice 

 irregulariter striato ; apice acuto, inflexo. 



In the paper on Rock Specimens, furnished by Mr. Konig, is 

 the description of a new species of fossil Zoophyte, which he has 

 called Catenipora Parrii ; the following are its characters ; C. tu- 

 bulis crassiusculis. compressis, collectis in laminas sinuatas varie 

 inter sese coalitas ; tubulorum orificies ovatis saepe confluentibus ; 

 dissepimentis confertissimis : found by Captain Parry in Prince 

 Regent's Inlet, at the foot of a high hill ; — in transition Lime- 

 stone ? 



On FOSSIL SHELLS, bj, Lewis Weston Dillwyn, 

 Esq. F. R. S.* 



The object of this paper seems to be to draw the attention of 

 Geologists to Fossil Shells as being the most numerous, and gene- 

 rally the best preserved organic remains, and consequently the 

 most interesting for geological research. By availing ourselves of 

 certain analogies, proved by the exact conformity in the struc- 

 ture of many of these fossils with living genera, Mr. Dillwya 

 thinks some circumstances attending the geological distribution 

 of Fossil Shells may be observed, which have hitherto escaped 

 notice. The principal circumstance which Mr. Dillwyn has 

 pointed out, is the remarkable paucity of the Carnivorous Trache- 

 lipodes in the older beds, from the Transition Lime to the Lias, 

 in which the chambered (Carnivorous) Cephalopoda abound : 

 and judging from the occurrence in such great numbers of the 

 * Philosophical Transactions, 1823. ' Road June the 5th. 



