147 



Ancyrocrinus bulbosus. Hall, (Fig. 28.) (loth Rep' t 

 N. Y. State Mus. Nat. Hist,, p. 90. ) 



Distinguishing Characters.— Bulbiferous lowerend ; oblique 

 ascending processes ; column round below, obtusely quad- 

 rangular above. Found in the Moscow shale, three to five 

 feet above the Encrinal limestone, at Section 5 ; and also in 

 the Demissa bed of Section 5 (rare). 



Crinoid Joints and Stems. (Fig. 29.) 



These bodies are of common occurrence. The Encrinal 

 limestone is in places almost made up of their fragments 

 (hence the name), though few calices have been found in that 



Fig. 29. Crinoid Stems, Joints and Roots, (a, b) Stems ornamented with tubercles ; 

 (c. d) stems with ambulations ; (el joint with beveled margin; (/, go joints with three ver- 

 tical expansions or wings : (h) part of stem, with only one joint ornamented by expansions ; 

 u.j) smooth stems, with thick and thin joints respectively ; (fc) fragment of a large joint 

 with a knife-edge bevel, the dotted line shows original size; (Z) a coiled stem : im-o) 

 " roots " attached to shells, etc. (All natural size except n and o which are x 4. Original.) 



rock. The stems are extremely abundant in the Demissa 

 and Stictopora beds, but are comparatively rare elsewhere. 

 A number of species are represented, but no attempt at 

 identification has been made. Not infrequently nodal joints 

 occur, which have a projecting knife-edge margin (Fig. 29, A- ), 

 and others with three projecting vertical plates. (Fig. 29, f, 



