BULLETIN NO. 2. 25 



Basal margin broadly rounded, beak rather prominent, anterior 

 margin more narrowly rounded than the basal, but not quite per- 

 fect in the specimen in hand. 



Surface ornamented with numerous concentric striae, or fine lines 

 of growth that are most conspicuous on the borders of the shell. 



Length -ff inch ; greatest breadth -f^^ inch. 



This species resembles in its general form the L. mytiloides of 

 the Coal Measures, but differs from that in its uniformly much 

 larger size and relative proportions. 



Bare, and hitherto found only in the Warsaw beds of the St. 

 Louis group at Warsaw and near Hamilton, 111. 



No. 2495 of the Illinois State collection. 



Collector, A. H. Worthen. 



GENUS LEPETOPSIS, Whitfield. X 



LEPETOPSIS CHESTEEENSIS. (sp. nOV.) 



Shell of medium size, longitudinally ovate, anterior and pos- 

 terior portions regularly rounded and about equal in length, a 

 little broader behind than in front, apex pointed, and directed 

 slightly backward, height equal to about one-third the greatest 

 length. A shallow depression or sinus commences immediately 

 behind the apex and increases rapidly in width the posterior mar- 

 gin. Surface ornamented with numerous somewhat irregular sized 

 concentric lines that arch upward in crossing the sinus-like de- 

 pression behind the apex. 



Length ^^ of an inch ; greatest breadth y^ inch ; height about 

 y% inch. 



This species is related to L. Levetti, of the Warsaw beds, but 

 may be distinguished by its more elongate form, and the sinus- 

 like depression behind the apex. 



Position and locality : Lower division of the Chester limestone, 

 Chester, 111. 



No. 2514 of the Illinois State collection. 



Collector, Mrs. J. C. Salter. 



PALy^OCRINOIDEA. Waehs and Spr. 

 GENUS BATOCEINUS, Casseday. 



BATOCBINUS MONTGOMEKYENSIS. (sp. nOV.) 



Body below the arms spreading into a saucer-like form, more 

 than twice as wide as high, and composed of slightly convex granu- 

 lose plates. Dome inflated, nearly twice as long as the body be- 

 low, and composed of nearly flat plates, each of which has a 

 small obtusely pointed node in the center. Ventral tube central 

 and apparently rather slender. 



