362 PROCEEDINGS OF THE ACADEMY OP [1885. 



Pig. 18. Bide view of the same specimen, showing the proximals and 

 the radial-dome-plates which alternate with small interradials and 

 gether \\ itli the former plates rest against the muscle-plates. 



i'ii.. 1 I. Side view of another specimen, showing the summit plates, inter- 

 radials, portions of the arms and id' the anal tube. 



Fig. 15. Catillocrinus WachtmutM M. & W. A nearly perfect specimen 

 with arms, showing the small anterior and one of the large antero- 

 lateral radials. 



Fig. 15ff. View of the broken upper end of the same specimen, gving a 

 transverse section of arms and ventral tube. 



Fig. 16. Side view of another specimen, showing the dorsal side of the 

 large plates composing the anal tube. 



Fig. 17. Underbasal disk of Agassizocrinus. Ventral view, showing the 

 ramifying furrows toward the basals, and the six pits within the inner 

 cavity. 



EXPLANATION OF PLATE VL 



A series of diagrams, showing the position of the lateral cirrhi, that of 

 the axial canals and outer angles of the stem, in monocyclic and dicyelic 

 Crinoids. For better comparison, the upper side is in all these figures 

 interradial, and represents in most cases the azygous side. 



1. Abactinal aspect of Xenocrinus. 



Base of Reteocrinus. 



Calyx plates of Talarocrinus. 



Calyx plates of Atelestocrinus robustus. 



Calyx plates of Tribrachiocrinus. 



Base of Rhodocrinus. 



Calyx plates of Carabocrinus. 



Abactinal aspect of Millerocrinus Milleri.- After De Loriol. 



\ bactinal aspect of Zeacrinus nodosus. 

 Fig. 10. Inner view of the calyx o£ Millerocrinus Milleri, showing the posi- 

 tion of the axial canals. After De Loriol. 

 In.. 11. Abactinal aspeel of the laiva of Antedon rosacea, shortly before 



the detachmenl from the stem. After Dr. W. B. Carpenter. 

 Fig. 12. Base of Heterocrinus and Stenocrinus, the column removed. 

 Km;. 18. Basals of Stenocrinus, with a joint of the quinque-partite column. 

 PlG. 11. Basals ,,r //, terocrinus, \\ it li a joint of the tri-partite column. 

 FlG. 1"». 1 la sals o( Barycrinus, with the joint of thequ'nque-partite column. 

 Fio. if,. [Jnderbasals and lirst stem-joint of Poteriocrinus. 

 Fig. IT. Basals and firs! stem-joinl of Glyptocrinus. 

 Fig. 18. Basals and the i ri- partite upper part of the stem in Forbesiocrinus, 



Onychocrinus and Taxocrinus. (The underbasals are covered.) 

 l'io. 19. Basals and column of Actinocrinus, Batocrinus, etc. 

 Fig. 20. Basals and colums of Mnjistocrinus Evansii. 

 PlG. 21. Basals and column of Dolatocrinus. 

 Fig. 22. Basals of Eucalyptocrinus and Melocrinus. 



