170 CRINOIDS. 



are, however, other characteristics which entitle Dorycrinus to 

 rank as a valid genus. 



Neither Hall, Shumard, de Koninck & Lehon, Picket nor 

 Schultze have recognized Dorycrinus — all referring the species 

 to Actinocrinus. It agrees with this genus only in the general 

 family features, and in having the radial parts of the calyx 

 more or less distinctly extended into lobes. Dorycrinus in- 

 clines far more toward Batocrinus and Bretmocrinus, with 

 which it corresponds in the general form of the plates and in 

 the peculiar arm structure, here becoming a constant character. 

 It differs, however, very essentially in the usually lobate nature 

 of the calyx, its strongly expressed bilateral symmetry, the lat- 

 eral position of the anus, opening directly through the test, and 

 in the shortness and delicacy of the arms. It is distinguished 

 from Agaricocrinus and Amphoracrinus by the shape and pro- 

 portions of the calyx, the arrangement of the plates and the 

 altogether different arm structure. ( Wachsmuth & Springer). 



Dorycrinus elegans Miller. 



Dorycrinus elegans Miller, 1892: Geol. Sur. Indiana, 18th Ann. Rep. , adv. 

 sheets, p. 17, pi. iii, figs. 4-5. 



A small form closely related to D. kelloggi, but lobes not 

 so well defined. 



Horizon a?id localities — Lower Carboniferous, Burlington 

 limestone : Sedalia. 



Dorycrinus subaculeatus ( Hall). 



Actinocrinus subaculeatus Hall, 1858: Geol, Iowa, vol. I, p. 570, pi. x, figs. 



2a-b. 

 Dorycrinus subaculeatus Meek & Worthen, 1873: Geol. Sur. Illinois, vol. 



V, p. B80. 



A small, subglobular form, very slightly pentalobate. Pos- 

 terior oral produced into a prominent, sharpened nodosity, 

 instead of the usual long spine. Surface nearly smooth, un- 

 marked. 



Horizon and localities — Lower Carboniferous, Lower Bur- 

 lington limestone : Louisiana. 



