140 



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

 which is with some hesitation referred to this species. The 

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

 defined, and the spine of the bifurcating second costal is 

 represented by a blunt tubercle. A small anal interradial 

 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. mm this 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 azygous 

 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 AXCYROCRINUS. Hall. 



[Ety. : Ankara, grapnel ; Jcrinon, lily.] 



(15th Rep't X. Y. State Mus. Nat. Hist., p. 89;) 



This genus was founded on what appears 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. From the center the main stem ascends. 



Fig. 2*. Ancyro- 

 crinus b " Ibos us. 

 (a) Norma] speci- 

 men w i i h spines 

 restored: (b-g) vari- 

 ously deformed in- 

 dividuals : (/'. c i 

 specimen with Hat 

 base and four irreg- 

 ular prongs! ; (fit) 

 specimen with nu- 

 rous prongs di- 

 verging at different 

 levels : i e. /) .speci- 

 men with prolonged 



base and three 

 prongs: [a) speci- 

 men wi t h broken 

 base, prongs di- 

 verging nearly at 

 right angles, stu- 

 dent PalBBontolog- 

 ical < lollect ion. Har- 

 vard University, 

 ( 'at. ■.':'.; . << Higinal.) 



