NORTH AMERICAN PALEONTOLOGY. 245 



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

 (Geol. Mag., nevr ser., Decade iii, vol. iii, pp. 503, 504, November, 

 isSG. London.) 



Notice or abstract of a paper read before the British Association for the Ad- 

 vancement of Sciencej Birmiugham, September, 188G. Section C (Geology). 



Dawson, J. W., Sir. (See Grant, O. E. ; Weiss, Ernst.) 



DoLLO. {See Lydekker, K.) 



DwiGHT, ^YILLIAM B. Hecent Explorations in the "Wappinger Valley 

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

 siliferous Potsdam strata at Pougbkeepsie, New York (illustrated by 

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

 February, 18SG. New Haven.) 



Gives a list of the fossils found, and mentions a new species of Ptijchoparia 

 {ConoceplialUes) , resembling the loivensis, but possessing an occipital spine. 



DwiGHT, William B. Discovery of fossiliferous Potsdam strata at 

 Pougbkeepsie, New Y'ork. (Proc. A. A. A. S., vol. xxxiv, pt. 1, pp. 

 204-209, 1880. Salem.) 



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

 College; describes the stratigraphic relations, and gives a preliminary 

 list of the species found. 



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

 Ellis, 11. W. Keport 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. Eep., new ser., vol. i, i)p. le-71e, 188G. Montreal.) 



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

 stone grit plants, are from their stratigrai)hical position without doubt 

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

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

 fossils determined by Mr. H. M. Ami, from Wentworth station, and cites 

 the list determined by the late Mr. Billings from the same place. 



ETHERiDaE, Egbert, Jr., and P. Herbert Carpenter. Catalogue 

 of the Blastoidea in the geological department of the British Museum 

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

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

 lustrated by twenty lithographic plates, etc. pp. i-xa^i 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-plates; the hydrosjiires and spira- 

 cles; the zoological characters of the Blastoidea. 



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

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

 time ; astratigraphical list of all known Blastoids arranged geographicalh". 



Classification. — Description of the species. — Bibliography. 

 Classification. 



Class Blastoidea. 



