Talbot — New York Ilelderbergian Crinoids. 33 



the specimens. Although one individual shows the canal very 

 well at the distal end of the cirri and the proximal end of the 

 stem fragment, this canal is not visible at the distal end of 

 the bnlb on any individual under observation. A small depres- 

 sion on one specimen looks like a cicatrix of attachment. 

 Several individuals have the crescentic form of the joints of 

 the column, as in Herpetocrinus. 



Horizon and locality. — Lower part of the Xew Scotland 

 limestone in the Helderberg Mountains. 



Cotypes in the American Museum of Natural History and 

 the Xew York State Museum. 



EXPLANATIONS OF PLATES. 

 Plate I. 



Figure 1. — Melocrinus pachydactylus. About natural size. 



Figure 2. — Thysanocrinus arborescens showing the hexagonal column and 



the branching of the arms. About natural size. 

 Figure 3. — Mariacrinus beecheri showing the thin stem joints near the 



crown and the separation of the two parts of the rays toward the distal 



end. About natural size. 



Plate II. 



Slab containing stems and crowns of Melocrinus nobilissimus. Reduced a 

 little more than one-half. 



Plate III. 



Figure 1. — Ichthyocrinus schucherti showing the characteristic straight 



sides of the crown and the straight suture lines, x 2. 

 Figure 2. — Cordylocrinus phunosus showing the long, crowding cirri and 



the one- and two-pinnuled joints of the arms, x 2. 

 Figure 3. — Distal end. of the stem of Homocrinus scoparius showing the 



coiling and the delicate cirri. x 2. 

 Figure 4, — Cordylocrinus jjhimosics. The upper specimen on the plate 



shows the anal sac. x 2. 



Plate IV. 



Figures 1-6. — Edriocrinus pocilliformis. x 2. 



Figures 1 and 2. — Simple ordinary forms, basals and infrabasals fused. 



Figure 3. — Cup showing fused basals as a prominent ring, also cicatrix of 

 attachment. 



Figure 4. — Cup showing ring of basals, not protruding, and high narrow 

 radial s. 



Figure 5. — Cup showing radials, but basals indistinguishable from infra- 

 basals. 



Figure 6. — Cup showing basals and infrabasals fused and radials fractured 

 transversely. 



Figures 7 and 8.—Brachiocrinus nodosarius. x 2. 



Figure 7. — Portion of the column showing the bulb at the distal end and 

 the beadlike cirri. 



Figure 8. — A larger bulb with the first joints of two cirri attached. 



Am. Jour. Scl— Fourth Series, Vol. XX, No. 115.— July, 1905. 

 3 



