PLATE II. 



Arachnocrinus extensus Wachsmuth and Springer. 



Fi^. 1. Dorsal view of a third specimen with base broken off, showinj; l)raheliinj; of ante- 

 rior and two lateral rays. 

 2. Small specimen perhaps of this species, from LeRoy, N. Y. 



Arachnocrinus bulbosus (Hall). 



Onondaga Group, Middle Devonian. Livingston Co., N. Y. 



Fig. 3. One of the types (15th Rept. N. Y. St. Cab., PI. I, fig. 19); dorsal view, sliowing 

 arrangement of plates somewhat different from Hall's figure. The surface is 

 much corroded, and sutures difficult to see; there is no such anal plate as origi- 

 nally figured. Amer. Mus. Nat. Hist., New York. 



An, h. R. ant. radial and post, views of another specimen in same collection, showing 

 form of calyx, and great size of axillary brachials; and anal opening between 

 post. B and RR. 



.5rt, h. R. ant. interradial, and 1 . post, radial views of a fine specimen in the New York 

 State Museum at .\lbany ; showing the same structures, and the stem with greatly 

 projecting nodals. It lies on a very thin piece of limestone, which has been 

 cleaned away to show both sides of the specimen. 



r)c, (/. Nodal and internodal colunuials, showing the central axial canal with 4 smaller 

 peripheral ones; one is the section of stem of 56, and the other a loose colunnial 

 lying with it. 



5c. Outline of posterior side of calyx, showing position of anal opening. 



(iff, h. Posterior and basal views of free calyx, showing undivided TBI? pentagon, 

 with quadripartite axial opening; dorsal canal appears double; the hole in 

 r. post, basal in (j6 is due to injury. 



7. Ventral view of specimen in New York State Museum, Albany, showing anal open- 



ing, and ventral furrow in arms. 



8. Ventral view of another specimen, in author's collection, enlarged; showing irregu- 



lar bifurcation of rays, the ventral furrow, and some covering plates in place; 

 orientation uncertain, lower left ray probably the anterior. X 2. 



9. An axillary brachial, further enlarged; showing the sockets for covering plates, 



8 or 9 at each side. X 4. 



10. Dorsal view of small specimen showing irregular bifurcation of rays; orientation 



uncertain. 



11. Similar view of large specimen, showing dorsal canal in several places. 



12. Another large specimen, showing jionderous character of arms. 



