Dr. H. Woodward — Cretaceous Canadian Crustacea. 399 



surface of the appendages is rugose. Three of the body-segments 

 can be seen. Locality : Hornb}^ Island ; W. Harvey, 1895. 



Although not refigured, it seems desirable, in order to complete 

 this record, to reproduce Dr. Whiteaves' description of this additional 

 Cretaceous form. 



"Pal^astaous (?) OENATUS, Whiteavos. 



Falaastacui (?) ornata, "WTiiteaves, 1887, Geol. and Nat. Hist. Surv. Can. Ann. 



Eep., N.S., vol. ii, p. 161 E. 

 Palceastactis (?) ornata, Whiteaves, 1889, Contrib. Cauad. Palajont., vol. i, pt. ii, 



p. 183, pi. XXV, tig. 3. 



" The foregoing was suggested as a provisional name for a rather 

 remarkable specimen of a macrouran decapod which evidently 

 belongs to the family Astacomorpha of Zittel [1885]. Of Cretaceous 

 representatives of this family it seems to come nearest to such 

 genera as Palceastacus and Hoploparia, though it diifers from each 

 in some important particulars. In many respects it appears to the 

 writer to be still more nearly related to the recent fresh-water 

 genera Astacua and Gamhartis, but there is good reason for supposing 

 that it will eventually prove to be the representative of a new 

 generic type, which at present there is not sufficient material to 

 define satisfactorily. 



•'Nearly the whole of the under surface of the cephalothorax of the 

 specimen is buried in the matrix, the front margin of the carapace is 

 very imperfect, the caudal plates, as well as the under part of the 

 five abdominal segments, are broken off, and only small portions of 

 the chelae and of the other ambulatory legs are preserved or exposed. 



" The carapace is moderately convex and slightly depressed, and 

 not quite twice as long as broad. It is divided into two nearly 

 equal parts by a single, well-marked, and deeply impressed cervical 

 furrow, which is arched forward in a sliallow, concave curve. 

 Behind this furrow the lateral margins of the carapace are slightly 

 expanded, the branchial region is moderately inflated, and the 

 posterior margin is slightly concave in the middle. A short distance 

 in advance of the cervical furrow, on the outer and lower portion of 

 the carapace, on each side, there is a very short and transverse groove 

 or narrow constriction, which may possibly be confluent with the 

 neck-furrow on the strongly curved lateral margins of this pai-t of 

 the carapace. The exact outline of the anterior margin of the 

 carapace cannot be ascertained, and the tip of the rostrum is broken 

 off. The basal portion which remains is about seven or eight milli- 

 metres long. At the base it measures 5 mm. in breadth, and at the 

 broken anterior extremity its breadth is 2 mm. Its outer margins 

 are defined by two linear and acute, tuberculated, and raised longi- 

 tudinal ridges, between which the surface is smooth and concavely 

 excavated. 



" The whole of the outer surface of the carapace is ornamented 

 by rather distant, isolated tubercles. In its posterior moiety these 

 tubercles are somewhat irregularly disposed, though there is a low, 

 very narrow, and rather inconspicuous keel on the median line, on 



