8 Fietp Co_.umMBpiaAN MuszEuM—GEo Locy, Vot. II. 
This genus was based upon vertebral centra alone, from the 
cervical, dorsal and caudal regions; the author, however, referred 
them all erroneously to the dorsal and lumbar regions. The type is 
well figured in Leidy’s work on Cretaceous Reptiles, plates v and vi. 
The vertebre have infracentral vascular foramina. The ribs are 
single-headed. The largest centrum measures 110 millimeters in 
the greatest diameter. This genus has served as a sort of waste 
basket for the reception of fragments and poorly known forms. C. 
snow is known froma skull and long neck. It can scarcely belong 
in Crmoliasaurus. 
DISGCOSAURUS: 
Leidy, Proc. Acad. Nat. Sci. Phil. 1851, 326 (1852). 
PLANIOR Leidy, Proc. Acad. Nat. Sci. Phil. 1870, 20, 22; Cope, Cretac. 
Vert. 1875, 255 (Crmoliasaurus).—Cretaceous, Mississippi. 
Discosaurus vetustus Leidy, Cretac. Reptilia, 23, pl. 5, ff. 10-12. 
vetustus Leidy, Cretac. Reptilia, 22, pl. iv, -ff. 13-18, DE vy Here os 
Proc.’ Acad. Nat. Sci. Phil? 1851,,3 26; Cope, HL xtiivanmee ie 
etc. 256; Amer...Journ.. Sci. 1870, 1415 Cretac-¢Veraammgies 
255 (Crmoliasaurus).—Cretaceous, Alabama. 
This genus was based upon the mutilated bodies of two caudal 
vertebra from the Cretaceous of Alabama. Leidy associated with 
these other mutilated vertebrae from the Cretaceous of Mississippi, 
New Jersey and Alabama. Cope suppressed the name, as of a genus 
insufficiently differentiated from C7zmoliasaurus. This is quite true, as 
it is also true of several of Cope’s own genera of the plesiosaurs. It 
is not at all improbable, however, that there are different species, and 
perhaps different genera represented by the specimens Leidy described 
and figured. ck 
BRIMOSAURUS. 
Leidy, Proc) Acad. Natasa Philos 54574: 
GRANDIS Leidy,. Proc. Acad, Nats Sci.) Phil. 1854, 73; pleap wets 
ibid. 1870, 10; ibid» 4871, 22° (Discosaurus), Copersiaae 
Batrachia, etc. 1869, 43,54 (Czmoliasaurus); Proc. Bost. Soc. 
Nat. Hist. 1869, 266 (7¢.); Amer. Journ. Sci. 1870, 269 (zd.), 
Rep. Geol. Surv. Terry. 1871, 400 (zd@.);. CretaGV Gaiesaau as 
255 (¢d¢.)—Cretaceous, Arkansas. 
This genus and species were founded upon more or less imperfect 
