186 Miscellaneous, 



sp. n., and 1 Naufihis) ; and 15 Echinodermata (of Cidarida} 10 new 

 species and a fragment ; of Galeritidae 2 new species ; of Cassidu- 

 lida) 2 new species ; of Spatangidjc 2 species, 1 of them new ; and 

 one fragment of an Astcrid). 



To the G species of Mollusks already known from the freshwater 

 group 5 species are now added, and all but one of them are figured 

 together on plate xxvi. 



Prof. E. D. Cope has compared the Yertebrate fossils from the 

 Periiarabuco basin with those of the Fox-hill group of the Western 

 United States, and those of the Eahia freshwater group with the 

 fossils of the Laramie group of the same region, these two being 

 the upper members of the Cret.aceous series of North America. 



Mr. Derby mentions at p. 8 that, from about the latitude of Bahia 

 northward to the coast near the city of Maranham, the high inte- 

 rior plateau, against which the fossiliferous strata of the coast abut, 

 is overlain by a thick series of sandstones and shales, which at 

 several points have yielded many hsh-remains, regarded as of Creta- 

 ceous age by Agassiz, but Jurassic by Newberry and Cope. Presu- 

 mably older than the coast basins, and divided from them by an 

 uprise of the land, should the plateau-beds prove to be of Cretaceous 

 age, those on the coast will be referred to the middle or later part 

 of that age. 



The exact distribution of the marine fossils described by Dr. A. C. 

 "White is exhibited in an extensive and valuable table (with an 

 explanation) by Mr. 0. A. Derby at pages 204-271, " so as to facili- 

 tate the examination of the question as to whether the fauna of any 

 of these localities (27 altogether) presents ditlerences that indicate 

 distinct geological horizons, or only such as might be expected 

 from differences in geographical position, in the character of the 

 rocks, and in the degree of completeness in which the fauna of each 

 locality is represented in the collections." 



The descriptions of the fossils (pp. 20-203) are enriched with 

 Dr. White's wide experience of the varietal changes and migrational 

 distribution of such organisms. The tMcnty-eight quarto litho- 

 graphed plates give admirable representations of the specimens, 

 whether perfect or otherwise, evidently with careful exactness ; and 

 with them and the elaborate descriptions we have a very valua1»le 

 work of reference both for geologists interested in Brazil and for 

 those who may be studying the Cretaceous formations in other parts 

 of the world. 



MISCELLANEOUS. 



The Devilojimcnt of iJie Central Xevvous St/stem of the ruhnonuta. 

 By Dr. Feud. Scn.MiDT. 



AT.Tnoron the development of the Gastropods, and of the Pul- 

 monata in particular, has already often been the subject of close 



