146 



(Fig. 27) represents a calyx obtained from the Deniissa bed. 

 which is with some hesitation referred to this species. The 

 median ridge, on the center of the plates is strong, bnt ill 

 defined, and the spine of the bifnrcating second costal is 

 represented bv a bhmt tnbercle. A small anal intei-radial 

 appears on the exposed side of the specimen, and above this 

 primary interradial, appears a secondary one, much smaller. 

 In the original description of T. nuntius Hall states . . . 

 . . ••interradial and anal plates, apparently none."' From 

 the description we may gather that the type specimen was 

 an imperfect one, and it may have been that the azygons 

 side, if present, was not exposed. 



The specimen figured is somewhat crushed and distorted. 



What appears to be arms of this, or a closely-related 

 species, were obtained on a slab of shale at Section 7, from 

 between nine and twelve feet below the Encrinal limestone. 

 They are figured herewith. 



Genus ANCYROCRINUS. H.\ll. 



[Ety. : Ankara, grapuel ; kriiioii, lily.] 

 (15th Rep't N. Y. State Mas. Nat. Hist., p. 89.) 

 This genus was founded on what ajipears to be the base 

 of a stem enlarged into a bulb, from which four ascending- 

 processes diverge, giving the whole a resemblance to an 

 anchor. Frcmi the center the main stem ascends. 



Fig. 28. Ancijro- 

 crinus bill bo s u s . 

 (a) Normal speci- 

 men with spines 

 restored ; ib-g) vari- 

 ously deformed iu- 

 d i V i d u a 1 s : (b, c) 

 specimen with tlat 

 base and four irreg- 

 ular prongs : (d) 

 specimen with nu- 

 merous prongs di- 

 verging at different 

 levels : ( e, / ) speci- 

 men with prolonged 

 base and three 

 jjrongs: (g) speci- 

 men with brolsen 

 base, prongs di- 

 verging nearly at 

 right angles. Stu- 

 dent Palaeontolog- 

 ical Collection. Har- 

 vard University, 

 Cat. ^37. (Original.) 



