18/8.] The Paleontologist. 15 



The specimen from which my description of H. dendrina was made, is very fine, nearly 

 perfect, the branches being very slender and delicate, slight exposure and rubbing would 

 have broken it up; it was protected in a peculiar manner, as stated in the description 

 lying in a depression in a fragment of rock. It was found by Mr. Charles Schuchert and 

 in his possession at the time I described it, but some time after he disposed of it so he 

 informed me, to Mr. C. B. Dyer. It is recorded with the description of B. fruticosa, that 

 '■'■the specmien figured is from the collection of C. B. Dyer." 



All other specimens that I have seen of this species are fragmentary U. P T 



A CLASSIFIED LIST OF LOWEE SILUEIAN FOSSILS CINCIN- 

 NATI GEOUP. BY JOHN MICK EL BOROUGH AND A. G. 



WETHERBY. 



A paper with the above title is published in the july number of the Journal of the Cir 

 cinnati Society of Natural History. A valuable list in its Classification and Etymology of 

 names, and must prove useful to students, but its value and usefulness are impaired by 

 inaccuracies, some of which will be noticed. 



'Rtyric\\\2ifalcigera, Hall & Whitfield, is given as a distinct species; it is a synonym for 

 B. Chambersi, Miller. 



Acidaspis anchora/is, Miller, is given as distinct, should be synonym for A. Cincinnati- 

 ensis. Meek. 



Orthis profundo-sulcata, Owen is placed as a synonym for O. biforata, Schlotheim- it is 

 a strongly marked variety at least 



Or\h\s pro I ongata, Owen, is credited to James. It was printed in Owen's Catalogue 

 1843, ^^^ should be Owen. 



Orthis tnfiata and O. Annieanna, James, are given as "considered synonyms of species 

 above named;" they are as marked varieties, at least, as others so placed. 



Orthis insculpta. Hall, is considered by some to be a synonym for O. bella-ru'^osa Con- 

 rad ; it is placed as distinct in the list. 



Rhynchonella jz><;'r/rtwt7/^jrt, Whitfield, is given as a distinct species; it seems to be only 

 one of the numerous forms of R. capax, Conrad. 



?>\.TO-p'homtna. gibhosa, James, is given as synonym for S. rhomboidalis, Wilkins- it difters 

 much from types of that species, — is found only in the lower beds of the Cincinnati Group 

 about 80 feet above low water mark of the Ohio river at Cincinnati ; and between that 

 horizon and some 600 feet above, vertically, (25 to 50 miles from Cincinnati) in the upper 

 beds var. S. tenuistriata, .Sowerby, occurs for the first time ; no where within that verti- 

 cal range have specimens of either S. rhomboidalis or var. tenuistriata yet been found as 

 far as known to us S. gibbosa is a much more frail shell than either of the others and 

 differs in other respects. It might be considered a good variety at least ; at any rate it 

 marks a distinct horizon in the Cincinnati Group. 



Streptorhynchus neglecta, James, is placed as a synonym for '>\. filitexta ; we believe it to 

 be distinct ; the resemblance is quite remote, and the specimens very different from any 

 recognized filitexta. 



Streptorhynchus vetusta, James, is given as a synonym for S. planumbona, Hall ; how 

 this mistake occurred we cannot imagine ; they ilo not resemble each other at all. Vetusta 

 is somewhat \\ke filitexta. And it is equally strange how S. approximata, James, can be 

 confounded with S. Subtenta, Conrad ; they are so very different. 



Streptorhynchus //a««w<5o«a, Hall, is considered by some a synonym for S. substenta, 

 Conrad. 



