12 



two arms. The fourth primary radial in one of the rays is 

 abnormal, or the comuumcement of development toward some 

 other foim, that is unknown, provided other specimens, in this 

 species, do not retain the same character, in which case, it 

 might be a specific character. We have the character preserved, 

 only in the specimen that is illustrated. 



Pound in the Keolvuk Group, at Boonville, Missouri, and now 

 in the collection of S. A. Miller. 



BATOCKINUS VENUSTULUS. n. S]). 



Plate I, Fig. 7. (izygoiis side of cfdi/.r (Did arm.t, a lHlle 



depi-es&cd. 



Species medium size. Calyx oboonoidal, twice as wide as 

 high; each radial series bears a low angular ridge from the 

 basal plates to the free arms; intarradial areas slightly llat- 

 tened; surface granular; truncated for a medium-sized column. 



Basals form an hexagonal disc one-third wider than the 

 diameter of the column and ha\ing a height less than the dis- 

 tance from the column to the margin. First primary radials 

 very little wider than high, upper face sliglitly arcuate for 

 tlie reception of the second radials. Second jirimary radials 

 quadrangular, moi-e than twice as wide as high. Third pri- 

 mary radials pentagonal, a little larger tliun the second, about 

 twice as wide as high, axillary, and su))port upon the uj)per 

 slo[)ing sides the secondary radials. On the distal side of th(' 

 third primai-y radial, on the right of the azygous area there 

 are four scscondaiy I'adial.s, the last of which is axillary and 

 supports upon each u])per sloping side a free arm: on the 

 proximal side thei-e are two secondary radials. the last being 

 axillary and sup])oi-liug ujxm the distal side two tej-tiary ra- 

 dials and upon the ])r()ximal side 1hr(>e, the last ones support- 

 ing free arms, wiiicli giv(>s to this ray four arms In the i-ay 

 on the left of the azygous area, the third ])riraary radial sup- 

 ports, upon each u])per sloping side, two secondary radials, 

 the last being axillary and the pi-oximal .series bears on the 

 proximal side two tei-tiai-y radials and on the distal side two 

 tei-tiary radials and an axillary plat(> that su))ports two arms; 

 the distal series bears upon each up])er sloping side two ter- 

 ti;n-y radials one of which bears an axillary jjlate that sup- 

 ])ui-ts two arms. This arrangement gives to tliis ray six arms. 



