308 PROCEEDINGS OP THE ACADEMY OF 



olivii et valde rugosa ; dentibus cardinalibus parvis, compressis, obliquis ; la- 

 teralibus sublongis subcurvisque; margarita. alba et valde iridiscente. 

 Hab. Bengal, W. A. Haines. 



Anodonta Cailliaudii. Testa, laevi, rotunda, ventricosa, intequilaterali, an- 

 tice superne angulata; valvulis crassis, antice paulisper crassioribus ; natibus 

 elevatis, tumidis, incurvis ; epidermide nigro-fusca., obsolete radiata, superne 

 micante, inferne exilissime striata ; margarita argentea. et valde iridescente. 



Hab. Brazil, Monr. F. Cailliaud. 



Mvcetopus emarginatus. Testa, Isevi, transversissimeV compressa, emargi- 

 nata, ad latere planulata, antice inflata, postice ampliata. et compressa ; valvulis 

 pertenuibus, diaphinis, natibus parvis, prominulis ; epidermide luteo-cornea, 

 valde striata, nitida, eradita. ; margarita caeruleo-alba, et valde iridescente. 



Hab. Siam, S. R. House, M. D. 



Descriptions of new Fossil Remains collected in Nebraska and Utah, by 

 the Exploring Expeditions under the command of Capt. J. H. Simpson, of 

 TJ. S. Topographical Engineers, [extracted from that officer's forthcoming 

 report.]* 



BY P. B. MEEK. 



DEVONIAN SPECIES. 

 BRACHIOPODA. 



Spirtfera Norwoodt, Meek. Shell rather small, semicircular, wider than 

 long, having its greatest breadth on the hinge line. Ventral valve very con- 

 vex at the umbo, sloping abruptly to the front and sides ; beak elevated, 

 rather pointed, and more or less arched over the area, sometimes a little 

 twisted to one side ; mesial sinus rather shallow, rounded, and extending 

 to the point of the beak, from which it widens and deepens very gradu- 

 ally to the front ; area triangular, but wider than high, rather distinctly 

 arched; foramen very narrow, and apparently entirely open, having a depressed 

 line along each lateral margin. Dorsal valve convex, but much more de- 

 pressed than the other ; mesial fold obscure in the umbonal region, slightly 

 elevated, and rounded at the front. Surface of each valve ornamented by 

 about forty small depressed, radiating costse. some six or seven of which 

 occupy the mesial sinus of the ventral valve, and seven or eight the fold of 

 the dorsal valve. Length 0'50 inch; breadth (along hinge line) about 0*75 

 inch ; convexity 0-42 inch. 



Named in honor of Dr. J. Gr. Norwood of the Geological Survey of Missouri. 

 Locality and position. West side of Buell Valley, lat. 39 30' north, long. 

 115 36' west. 



Spirifera Engelmanni, Meek. Shell rather small, semicircular, about 

 twice as wide as long ; hinge equalling the greatest breadth, angular at the 

 extremities. Dorsal valve depressed convex; mesial fold rather narrow, 

 slightly elevated, flattened along the middle, and apparently without plica- 

 tions. Ventral valve very convex in the umbonal region, sloping abruptly 

 to the sides and front ; beak pointed, more or less arched ; area high, triangu- 

 lar, the hinge side being longer than the lateral slopes, which are usually 

 somewhat angular, generally rather strongly arcuate and inclined a little 

 backwards over the hinge ; foramen very narrow, apparently open to the point 

 of the beak; mesial sinus narrow, shallow, extending to the beak, flattened 



* Published by sanction of Hon. J. B Floyd, Secretary of War. More extended des- 

 criptions, with lull illustrations will appear in the report. 



[July- 



