INVERTEBRATES. 513 



This species seems to be somewhat similar to 0. occidentale of Prof. 

 "VTinchell, from the Michigan Marshall group (Am. Jour. Sci., xxxiii, 

 35G, 1862), but differs in being more rapidly tapering, aud iu having its 

 siphuncle uearly marginal, instead of placed midway between the centre 

 and the margin of the septa. If umch swollen between the septa, its 

 siphuncle must be really marginal at these points. 



The specific name was given iu honor of Prof. A. Winchell, State 

 Geologist of Michigan. 



Position and locality: White Sulphur Springs, Delaware county, 

 Ohio; Devonian. 



LOWER CARBONIFEROUS SPECIES. 



ECHINODEBMATA. 



Genus DOKYCKINUS, Boemer. 



Doeycrintjs Kelloggi, Worthen. 



PI. 29, Fig. 8. 



Body below the medium size, obconical below the arms, tapering rap- 

 idly to the truncated base, and depressed convex above ; base truncated, 

 excavated for the reception of the columnar facet, and slightly depressed 

 at the sutures ; first radials a little wider than high, three hexagonal and 

 two heptagonal ; second radials nearly twice as wide as high, two pent- 

 agonal and three hexagonal; third radials twice as wide as high, pent- 

 agonal and hexagonal, each supporting on its superior sloping sides a 

 pentagonal secondary radial, which is succeeded by another heptagonal 

 secondary radial, the latter supporting on each of its superior sloping 

 sides two brachial pieces, giving four arm openings to each ray. First 

 anal piece heptagonal and about the same size as the first radials, sup- 

 porting three others above, one of which is pentagonal, one hexagonal 

 and one heptagonal; these are succeeded by a dozen or more minute 

 and irregular shaped pieces extending up to the spiniferous or mammil- 

 lary plate at the apex of the summit. Around this central plate on the 



—66 



