Kansas IInifersity Science Bolletin. 



V.OL. IV, No. 6. MARCH, 1907. )vot°xV\Tr- 



Vox. XIV, No 6. 



SOME NEW FEATURES IN UINTAORINUS. 



BY H. T. MARTIN. 



Contribution from the Zoologrical Laboratory. 

 With plates IX and X. 



'T^HE morphological study of Uintacrinus by Mr. F. A. 

 -*- Bather, of the British Museum,^ closely followed by the 

 more elaborate memoir on this interesting crinoid by Mr. 

 Frank Springer,^ in which he so ably describes its relation- 

 ships and structure, seemed to cover all the points that pos- 

 sibly could be brought to li-ght on the subject. Nevertheless 

 it is the intention in this paper to try to present some new 

 features of the internal construction of the nerve grooves. 

 These were first found on the inner surface of a single calyx 

 in the writer's collection, and their presence confirmed by the 

 examination of several specimens in the University collection. 

 When examining specimen No. 1, I found that in this par- 

 ticular instance the thin lenticular mass forming the plate, or 

 slab, had been split by weathering and frost, from which I 

 concluded that by splitting other plates some interesting 

 features might possibly be shown. Accordingly a number 

 of small weathered plates were experimented upon, and these 

 amply repaid the effort, duplicating the appearances found 

 in the first one, and strengthening the evidence upon several 

 points shown on specimen No. 1. 



Specimen No. 1 shows the inner floor of a nearly complete 

 calyx (pi. IX, fig. 1) inverted and lying on its dorsal surface, 

 thus exposing, for the first time, to my knowledge, the cup 



1. On Uintacrinus: A Morphological Study. Proc. Zool. Soc. Lond., vol. isg.'j. pp. 974-1004. 



itions. 



(193) 



2. Uintacrinus; its Structure and Relations. Mem. Mu.s. Comp. Zool. Harvard Coll., vol. 

 XXV, No. 1. 



