15 



the second range, and above these there is intercalated a sin- 

 gle plate which is below the union of the first quaternary 

 |)latf's. 



Vault moderately convex and covered with polygonal convex 

 ;uk1 tumid plates. The jiroboscis is suhcenti';)!, but \\ is broken 

 ;i\vay from our specimen. 



This is the first Bdlocrhiiis ever descrilied, having twenty- 

 si'xcn anibulacral ojienings to the vault, and, ron.sequently, the 

 ;irni formula alone distiuquishes it from all other species. It 

 is peculiar also in its form and azygous ]ilates. 



i'^iiuud by F. A. Sampson in the Burlington (iroup, at Sedalia, 

 Missoiii'i, and now in liis I'ollection. 



BATOCIUNUS NITEUS, n. sp. 



Ptnle I. Fig. 30, hasol view: Fig. 31. azijgous fide: Fig. 3'J, 



ojyposHe vieir. 



Species medium size, biturbinate. Calyx moderately truii 

 cated, obconoidal, in the lower part, and rapidly spreading 

 near the arms, which are directed horizontally, and the radial 

 .series project beyond the interradial areas so as to give it a 

 stellate outline. No radial ridges. Plates without ornamenta- 

 tion. Sutures distinct. 



Basal plates form a low cup, having a height about equal to 

 half the diameter of the base, which is truncated only the size 

 of the column. Depression for the attachment of the column 

 moderately concave. Columnar canal small. First ])rimary 

 radials large, wider than long, three hexagonal, two heptag- 

 onal. Second primary radials quadrangular, and about twice 

 as wide as long Third primary radials a little larger than 

 the second, about twice as wide as long, pentagonal, axillai-y and, 

 in the two rays adjoining the azygous ai-ea, bear upon the ]>roxinial 

 sides two secondary radials, the last of which are axillary and suji- 

 port upon each superior sloping side two tertiary radials, and bear 

 upon each distal side three secondary radials, which gives to 

 each of these rays three arras. In each lateral ray the thirfl 

 primary radials support on each upper sloping side two sec 

 ondary radials, the last being axillary and supporting on eaiMi 

 superior side two tertiarj^ radials. which gives to each of these 

 rays four arms. The ray o]i]iosite the azygous area. bear,s 



