^'ISO Amdytkid Notices. 



']ongo-ovata; marglne integerrimo. 5th, Auca glacialis; testi 



ovali-elliptica, tenui, ^illos^, alM, concentrice et transversim 



striata ; postice rotundata ; umbonibus approximatis ; dentibus 



- sub-obsoletis ; margine integerrirao. 6th, Modiola lavigatai 



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



striata, postic^ rotundata laevigata. 7th, Pecten vitreus ; testa 



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



■ aequivalvis J auriculis subequalibus, Ixvibu?. 8th, Balanus gla- 



-cialis ; testa subcylindrica, obiiqua, albida, obsolete transTersim 



striata ; operculo antice profunde transversiai 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 siuuatas varie 

 inter sese coalitas ; tubulorura orificies ovatis saepe confluentibus ; 

 dissepimentis confertissimis : found by Captain Parry in Prince 

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

 stone ? 



On FOSSIL SHELLS, 6^ 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 maybe 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, 182S. ' Read Junt the 5th. 



