NORTH AMERICAN PALAEONTOLOGY. 245 



Dawson, J. W., Sir. Ou Canadian Examples of Supposed Fossil Algre. 

 (Geol. Mag-., nev* ser., Decade iii, vol. iii, pp. 503, 504, November, 

 188G. Loudon.) 



Notice or abst'r.act of a paper read before the British Association for the Ad- 

 Tancemeut of Science, Birmiughauj, September, 183G. Section C (Geology). 



Dawson, J. W., Sir. {See Grant, 0. E. ; Weiss, Ernst.) 



DoLLO. {See Lydekker, E.) 



DwiGHT, William B. Kecent Explorations in the Wappiuger Yalley 

 Limestone of Dutchess County, New York. No. 5, Discovery of fos- 

 siliferous Potsdam strata at Pouglikeepsie, New York (illustrated by 

 a map, plate vi). (Amer. Jour. Sci., 3d ser., vol. xxxi, i)p. 125-133, 

 February, 18SG. New Haven.) 



Gives a list of the fossils fonud, and meutious a new species of rttjclwpay'ia 

 (Coiioccphalilcs), resembling the loicciisis, but possessing an occipital spine. 



DwiGHT, William B. Discovery of fossiliferous Potsdam strata at 

 Pougbkeepsie, New York. (Proc. A. A. A. S., vol. xxxiv, pt. 1, pp. 

 204-209, ISSb'. Salem.) 



Describes a ledge rich in Potsdam fossils about one mile southwest of Vassar 

 College; describes the stratigrai^hic relations, and gives a preliminary 

 list of the si)ecics found. 



DwiGHT, W. B. {See Ford, S. W. ; Hiude, George J.) 

 Ellis, 11. W. Report on the geological formations of eastern Albert 

 and Westmoreland Counties, New Brunswick, and of portions of 

 Cumberland and Colchester Counties, Nova Scotia, embracing the 

 Spring Hill Coal Basin and the Carboniferous System north of the 

 Cobequid Mountains. 1884. (Geol. and Nat. Hist. Surv. Canada, 

 Ann. Rep., new ser., vol. i, pp. le-71e, 188G. Montreal.) 



Mentions fossil plants, which, while presenting some of the features of Mill- 

 stone grit plants, are from their stratigraphical position without doubt 

 older, and probablj' indicate a portion of the Lower Carboniferous forma- 

 tion ; these occur near Delaney Settlement. Gives a short list of Clinton 

 fossils determined by Mi\ H. M. Ami, fro.u Wentworth station, and cites 

 the list determined by the late Mr. Billings from the same j)lace. 



Etheeidge, Robert, Jr., and P. Herbert Carpenter. Catalogue 

 of the Blastoidea in the geological department of the British Mu.seum 

 (Natural History), with an account of the morphology and systematic 

 position of the group, and a revision of the genera and species. Il- 

 lustrated by twenty lithographic plates, etc. pp. i-xvi and 1-322, 

 figs. 1-8, pis. i-xx, 1886. London. 



Contains: Morphology. — The zoological history of the Blastoidea; the stem 

 and calyx ; the ambulacra ; the summit- jilates ; the hydrospires and si)ira- 

 cles; the zoological characters of the Blastoidea. 



Distribution. — The geological and geographical distribution of the Blastoidea; 

 table showing the distribution of the genera of the Blastoidea in space and 

 time ; a stratigraphical list of all known Blastoids arranged geogi'aphically. 



Classification. — Description of the species. — Bibliography. 

 Classiflcation. 



Class Blastoidea. 



