21 



Family BELLEROPHONTID.E. 



BELLEUOl'HON BLAIlil, U. Sp. 



ridte 111, Fi'i- 7, dorsal ririv of a ciisl ; V ((J. S, dorsal vievt 

 shoin'iH/ lite shell livlow Vie operlure. 



Kliell incdiiiin size, involuted, subglobose. VoliitioDS expaiidwl 

 very modfrately uutil the apeituro \s approached, when there is a 

 more uiarktd espaueion, and recurved lateral lips. Umbilicus 

 small, outer lip with ouly a modorato siuus in front and sides ex- 

 I)anded, recurved and narrowly rounded. Aperture transverse ai d 

 subreuiform. The volutions sre rounded toward the apex, but 

 subaugular on the sides of the last whorl. A slender dorsal band 

 appears on the last volution which is somewhat obscure on the 

 cast but well defined on the shell. The surface of the shell is 

 ornamented with numerous tine strife that arise from the dorsal 

 baird and curve gently forward and then backward over the ob- 

 tusely subaugular sides where they become obsolete. These trans- 

 verse stricc are not visible on the cast. 



This species is of the type of Bcllerophon bilolxdiis from 

 the Lower Silurian and there are several Silurian and Devonian 

 species that bear a more or less striking resemblance to it. There 

 is no difiiculty, however, in distinguishing the species on making 

 a comparison. There is no defined species from the Subcarbon- 

 iferous rocks with which any comparison is necessary. The gen- 

 eral form and surface ornamentation readily distinguishes it 

 among species from rocks of the same geological age. 



Found by K. A. Blair, in whose honor we have proposed the 

 specific name, in the Chouteau limestone, near Sedalia, Missouri, 

 and now in the, collection of S. A. Miller. 



LELLEKOPHON SEDALIENSIS, n. Sp. 



I'hde III, Fill- '■', dorstd vicin of (i Cdsl ; Fiij. Jo, lulcnd ricw of 

 jmrl of (I, specimen preserrimj ihe shell. 



Shell medium size, involute, subglobose. Volutions expanded 

 very moderately until the aperture is approached when there is a 

 marked lateral expansion. Umbilicus open. Outer lip with a 

 moderate sinus and expanded narrowly rounded sides. Aperture 

 transverse and subreniform. The volutions are rounded toward 

 the apex, but subaugular on the last whorl. The cast shows a 



