NORTH AMERICAN PALAEONTOLOGY. 241 



Cope, E. D. — Continued. 

 American Philosophical Society, October 16, 1885. (Proc. Amer 

 Phil. Soc. for 1885, pp. 23i-237, 1 pi. Philadelphia, 188().) 



These observatioDs are derived from a part of the skull of one of the Diadectidcc, 

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

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

 species, Biadccdes pJiaseolinus and Ennpedias molaris Cope, which, like the 

 first-named specimen, w^ero derived from the Permian formation of Texas. 

 The prominent features of this brain are the following : The widest part la 

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

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

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

 is cuormons 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 

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

 structure in common to all Gnathostomatous Chordata. 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 powder, probablj^ derived from the comminution 

 of otolites. 



Cope, E. D. {See Dames; Noetling-; Seely, H. G.) 



Ceagin, F. W. Notes on the geology of southern Kansas. (Bull. 



AVashburn College Laboratory Nat. Hist., vol. i, No. 3, pp. 85-91. 



April, 1885. Topeka, Kans.) 



Mentions 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, 188G. New York.) 



Calls attention 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., 3d ser., vol. iv, pp. G9-7U, November, 1880. Toronto.) 



Mentions the occurrence of some fossils which have usually been regarded as of 

 Lower Helderberg age, at Littleton, N. H. 



Dames, W. (Pieview.) J. B. Marcou: 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, fig. 290ff. Nea. Jahrb. Min., Geol., 

 uud Pal., 188G, Baud i, p. 452. Stuttgart.) 

 Abstract (?). 



Dames, W. (Review.) II. S. Williams : Ou a Crinoid with movable 

 spines. (Proc. of the Amer. Philos. Soc, 1883, pp. 81-88, 1 Tafel.) G. 

 J. Hiude : Description of a new species of Crinoid with articulatory 

 H. Mis. 000 10 



