248 

 TWO NEW SPECIES OF CRINOIDS. 



Walter R. Billings. 



{Read Jflh March, 1885.) 



GENUS EUSPIROCRINUS, ANGELIN. 



EUSPIROCRINUS OBCONICUS, U.Sp. 



Cup obconical, about \ wider than high ; tapering from 075 inch 

 at top to 25 inch at the column, 



Underbasals, five in number ; pentagonal ; siibequal ; about \ 

 wider than high. 



Basals, five; three hexagonal and two— those adjacent to the 

 anals — heptagonal. 



Eadials, five ; wider than high ; subpentagonal ; alternating with 

 the basals ; the middle third of their upperraosc side slightly excavated 

 for the attachment of the brachials. 



Brachials, variable in number ; of the anterior arm, four ; left pos- 

 terior arm, three ; right anterior and right posterior, five ; and the riglit 

 anterior either three or four, I am unable to say which, the specimen 

 not being sufliciently perfect. Above this the arms dichotomize fre- 

 quently one branch after leaving the l)racial dividing on the fourth 

 plate, tlie divisions ot which bifurcating on the fifth j)late, and at least 

 once again higher up. The secondary and tertiary bracials seem to 

 vary from five to six, the quaternary to be five, the quinary eight. 



No pinnuhv. 



Anals three, within the calyx ; the lowest ona pentagonal 

 havinw its two lower faces resting against the sloping sides of the 

 posterior and the right ])ostericr basals, the second resting on the 

 upper side of the ]>osterior basal, having on its right the first and 

 third anals and on its lefc one of the radiil plates. Above these is 

 a ventral tube of large pieces of which but tliree series of three plates 

 each were fully observed. 



Column of a 5-foil section, with a canal of corresponding shape 

 and a width about one-half that of column. The portion of column 

 collected is three and one half inches long ; 0-25 wide at base of cup, 



