Notices of Memoirs—R. Lydekker—Eocene Chelonia. 229 
NO tan @ in SS  (@iet hve VE @ iS: 
I.—On Two New Forms or Poryopont anp GonorHYNCHID FISHES 
FRoM THE Hocene or THE Rocky Mountarys. By Prof. H. D. 
Corr. Mem. Nat. Acad. Sci., vol. iii. pp. 161-165, with double 
plate. 
Ts 1883 (Amer. Nat. p. 1152) and again in 1885 (ibid. p. 1090), 
Prof. Cope briefly noticed a portion of the trunk of a fish from 
the Eocene of Wyoming, displaying many points of resemblance to 
the living Acipenseroid Polyodon, but remarkable on account of its 
possession of distinct scales, not confined to the upper lobe of the 
tail. The genus and species received the name of Crossopholis mag- 
nicaudatus, and in the present memoir Prof. Cope adds a detailed 
description, with figures, making known also a considerable portion 
of the skull of the fish. In many respects, the cranial bones are 
very similar to those of Polyodon, but the snout is relatively shorter, 
and more closely corresponds in form to that of Psephurus. The 
body is long and slender, with short dorsal and anal fins, remotely 
situated, and the former commencing slightly in advance of the latter. 
The scales are numerous, in oblique series, not quite in contact ; and 
each consists of a small subquadrate disk, with a row of long, 
sharp, backwardly-directed spines arranged upon the posterior 
margin. In an individual measuring 0:-170m. from the anterior 
extremity of the dorsal fin to the notch of the caudal, the scales only 
measure about one millimetre each way: the caudal fulera are large 
and strong. Another novelty from the Wyoming shales first noticed 
by Prof. Cope in 1885 (Amer. Nat. p. 1091) is also figured and 
described in detail, namely, the Motogoneus osculus. ‘This is of 
great interest as being scarcely distinguishable from the living 
Gonorhynchus, except in the dentition; for the latter genus—the only 
representative of its family previously known —is solely confined to 
the seas of South Africa, South and Western Australia, and Japan. 
As well remarked, ‘“‘ The discovery of this type in the Eocene beds of 
North America is a notable addition to ichthyological science. It is 
parallel with the occurrence of the family of the Osteoglosside in 
the same formation, a family also now confined to the Southern 
Hemisphere.” The memoir concludes with a figure and description 
of a small Priscacara, supposed to be adult and referable to a new 
species, P. hypsacauthus; and it is also added that a newly acquired 
specimen of P. serrata displays massive superior and inferior pha- 
ryngeal bones, covered with obtuse grinding teeth. Aves Wie 
I].—Eocrenr Cuenonta From THE Sart Rance. By R. LypeKker, 
B.A., F.G.S.  Paleont. Indica, ser. 10, vol. iv. pp. 59—69, 
plates xii. and xiii. 1887. 
WO interesting Chelonian fossils were obtained from the Lower 
Eocene of Nila, in the Punjab Salt-Range, by Dr. H. Warth, 
in 1886, and presented by him to the Indian Museum, Calcutta. 
These form the subject of the present memoir, and are interesting 
as being the only known Indian Chelonia of earlier date than those 
