302 RECORD OF SCIENCE FOR 1887 AND 1888. 



For the lower molars the termiDation e is cbanged to id in the first 

 four iiames for tlie correspomliug cusps, tlius, Hypocone for the upper, 

 Hypoconid for the lower. The term Upiconid is applied to the postero- 

 internal cusp. 



Osborne's pa iDer (214) in its original form was read before the Geolog- 

 ical section of the Bath meeting of the British Association in Septem- 

 ber, 1888, and also before the National Academy of Sciences, in New 

 Haven, November, 1888. An abstract was published in tlie American 

 Naturalist (see 213), and 214 is the full pa])er. The author defines "the 

 stages of Trituberculy as seen in different types " of the mammalian 

 teeth in their order of succession as follows: I. Haplodont type ((Jope), 

 not yet discovered. I, A. Protodont tubercular type; example, Droma- 

 therinm. II. Triconodont type (Osborne) ; example, Triconodon. 111. 

 Tritubercular type (Cope); example, lower molars of Spalacotherium 

 and Asthenodon. 



Osborne (211) gives a review of Mr. Lydekker's arrangement of the 

 Mesozoic mammals. 



E. D.Cope (50) discusses Riitimeyer's classification with some remarks 

 upon the American types found in Switzerland. Mr. Cope (40, 45, 47) 

 adds some new facts regarding the vertebrate fauna of the Puerco se- 

 ries. In the first jiaper (40) the new species Psittacotherium megalodus 

 is described, without figure, on page 409, and the species P. mnltifragum 

 is referred to. In the last paper (47) the author reviews his studies of 

 the Puerco epoch, while in the extended paper (45) the following species 

 and one new genus are described, without illustration : 



Chelydra crassa, p. 306. 



Onychodectes, (gen. uov.), P- 1317. O. tisonenais, p. 318. 



Miocl(vnus hathytjnaihus, p. 321. 



Mioclivnus i^entacus, j). 325. 



Miocla;)iHS gaudrianus, p. 326. 



Mioclwnns lydekJarianus, p. 328. 



Mioclwnusfilholianus, p. 329. 



Mioclwnus floverianus, p. 330. 



MtoclccnuH zitteUannH, p. 334. 



Mioclamiis turgiduncuhis, p. 334. 



ChriacuH schlosscrianns, p. 338. 



Chriacus ruetmeyeraxns, p. 340 



Chriacus stenops, p. 341. 



Chriacus inversus, ]». 342. 



Triisodnn biciilminafits, p. 343. 



Dissaciis navajoviKS, p. 344. 



Haploconus corniciilattts, j). 349. 



Periptychus hrahensis, p. 354. 



The vertebrate fauna of the Puerco series has reached the number of 

 one hundred and six species, among which are represented Cro^odilia, 

 Testudinata, llliynchocephalia, Ophidea, Aves, Marsupialia, Bunotheria, 

 Taxeopoda, and Amblypoda. 



H. F. Osborne (212) notes the discovery, by M.Filhols, of the identity 

 of Chalicotherium and Macrotherium. 



