304 R. Bullen Newton — Say^s Types of Maryland MoUusca. 



United States, having written a paper entitled " Geological Essay on 

 the Tertiary Formations in America " (Amer. Journ. Sci., 1824, 

 vol. vii, pp. 31-43), besides some further works on kindred subjects. 

 His last publication, issued in 1833, embraced his "Travels in the 

 United States and Canada" (8vo, London), where references are 

 made to the geology and mineralogy of those countries. 



According to official documents, Mr. Finch offered his collection 

 for purchase to the Trustees of the British Museum through 

 Dr. Charles Konig, who was then the chief officer of the Natural 

 History Department. This offer was accepted, and on the conclusion 

 of the usual preliminaries the collection becanie the property of the 

 Museum at the close of the year 1834. 



Unfortunately the whole of the types have not yet been rescued ; 

 some, of course, may never be found, whilst others may come to light 

 hereafter which have by mistake or chance been placed into wrong 

 drawers. In any case it is a fair matter for congratulation that, 

 after a period of 78 years since they were first described, a goodly 

 number of these types are still preserved in excellent condition 

 and are now available for the specialist to study. 



With regard to horizons it may be mentioned that, with one 

 exception, the species are of Miocene age, and belong to the 

 Chesapeake formation (see Professor W. B. Clark's " Physical 

 Features of Mai-yland " in the Maryland Geological Survey Eeport, 

 1897, p. 197) ; the exception is that of Ostrea compressirostra, which 

 belongs to the Pamunkey formation, and is therefore Eocene. The 

 nomenclature adopted in the list corresponds with the original as 

 used by Say in 1824, without any attempt at revision. 



List of Thomas Say's Types of Maryland Tertiary Mollusca 

 described in the Journ. Acad. Nat. Sci. Phil., 1824, vol. iv, 

 pp. 124-155, pis. vii-xiii, in the British Museum, arranged 

 in the order of original description : — 



Species. 

 Buccimim porcinuni 

 Buccinum aratum 

 Dispofcsa {gen. noY.) grandis 

 Fissurella redimicula 

 Ostrea compressirostra 

 Pecten Jeffersonius 

 Fecten Clinfonius ... 

 Fecten septenarius 

 FUcatula marginata 

 Area arata (left valve only) 

 Area centenaria (right valve only) 



Area iiicile (left valve only) 



Fectunculus suhovattis 



Crassatella undulata 



Isocardia fraterna 



Lucina eontracta ... 



Lueina anodonta ... 



Cytherea convexa (right valve only) 



AmpMdesma suhovata (right valve only) 



Fanopcea reflexa ... 



Ftentalinm attenuatum 



