NORTH AMERICAN PALXONTOLOGY. 241 



Cope, E. D. — Coutiuued. 

 American Philosophical Society, October IG, 1885. (Proc. Amer 

 Phil. Soc. for 1885, pp. 234-237, 1 pi. Philadelphia, 188G.) 



These observations are derived from a part of the skull of one of the DiadecHdce 

 {Felycosauria in the transverse molar teeth), of a single individual of un- 

 determined species. A few characters are derived from skulls of two allied 

 species, Diadccdes phaseoJinus and Empedias mohir'ts Cope, which, like the 

 first-named siiecimeu, were derived from the Permian formation of Texas. 

 The prominent features of this brain are the following- : The widest partis 

 at the origin of the trigeminus nerve. Both the cerebellum and optic tha- 

 lamus are flat and simple. The hemispheres are narrower than the seg- 

 ments posterior to them and of greater vertical diameter. The epiphysis 

 is cnormons and sends a process posteriorly between the tables of the parie- 

 tal bone. The olfactory lobes were apparently large and had a greater 

 transverse diameter than the hemispheres. The reduced diameter of the 

 hemispheres is a character of fishes and batrachia rather than of reptiles, 

 but the thalami are also smaller than is the case in batrachia. The small, 

 flat cerebellum is rather batrachian than reptilian. 



The result of this examination into the structure of the auditory organs in the 

 Diadectidw may be stated as follows: The semicircular canals have the 

 structure in common to all Giiathostomatotis Cliordata. The internal wall 

 of the vestibule remains uuossified as in many fishes and a few batrachians. 

 There is no rudiment of the cochlea, but the vestibule is produced outwards 

 and upwards to the fenestra ovalis in a way unknown in any other fam- 

 ily of vertebrates. 



I may add that in the specimen examined the semicircular canals were filled 

 with a white calcareous i)Owder, probably derived from the comminution 

 of otolites. 



Cope, E. D. {See Dames; Noetling; Seelj", H. G.) 



Cragin, F. W. Notes on the geology of southern Kansas. (Bnll. 



Washburn College Laboratory Nat. Hist., a'oI. i. No. 3, pp. 85-91. 



Ai)ri!, 1885. Topeka, Kan£.) 



Mcntious the occurrence of quaternary and tertiary vertebrate fossils and cre- 

 taceous invertebrate ones. 



Cunningham, K. M. New find of fossil diatoms. (Science, vol. vii. 

 No. 153, p. 35, January, 1886. New York.) 



Calls attenrion to an Important new locality in a clay strata in a railroad cut- 

 ting near Philadelphia. 



Dale, T. Nelson. New England Upper Silurian. (Proc. Canadian 

 Inst., od ser., vol. iv, pp. 09-70, November, 1886. Toronto.) 



Mc7itioiis the occnrreuce of some fossils which have usually been regarded as of 

 Lower Helderberg age, at Littleton, N. H. 



Dames, W. (Review.) J. B. Marcon: A list of theMesozoic and Cen- 

 ozoic types in the collections of the U. S. National Museum. (Proc. 

 U. S. Nat. Mus., vol. viii, 1885, tig. 290ff. Neu. Jahrb. iMiu., Geol., 

 und Pal., 1886, Baud i, p. 4»2. Stuttgart.) 

 Abstract (?). 



Dames, W. (Review.) U.S. Williams: On a Crinoid with movable 

 spines. (Proc. of the Amer. Philos. Soc, 1883, pp. 81-SS, 1 Tatel.) G. 

 J. Hinde : Descriptiou of a new species of Crinoid with articulatory 

 H. Mis. 600 16 



