12 SMITHSONIAN INSTITUTION 



PLATE III 



(All figures natural size except where otherwise stated) 



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Figs. 1-18. Lecanocrinus macropetalus Hall 129 



Fig. I. One of the type specimens, original of Hall's pi. 45, fig. ib. An individual of maximum 

 size ; posterior view. Am. Mus. Nat. Hist. Lockport, New York. 



(The specimens of this and following figures, if not otherwise noted, are more or 

 less flattened by pressure.) 



2. Another type, original of Hall's la. Shows the characters of the stem ; not enlarging at 



the calyx and with columnals alternating from the first. Same locality and collection. 



3. Another of Hall's types, fig. ic; r. post. view. Same locality and collection. 



4. Maximum specimen showing taper of the arms. Same locality and collection. 



5. Basal view of specimen from Grimsby, Ontario, showing large IBB. X -■ Author's 



collection. 

 6(7. Detached IBB plates of specimen from Lockport, New York; exterior view. Author's 



collection. 

 6b. Interior view of same, showing funnel; the lobes coinciding with IBB. X • 

 6c. Vertical section constructed from this and other specimens, showing the relative positions 



of the calyx plates. 

 7. Lateral view of very symmetrical specimen from Grimsby, Ontario. Coll. Sir Edmund 



Walker ; now in the University of Toronto. 

 8i;T, b, c. Anterior, posterior, and basal views of specimen from Grimsby, with a peculiar raised 



border parallel to margin of plates. Author's collection, 

 g. Small specimen from Lockport, with alternating columnals from calyx down. Author's 



collection. 

 10, II, 12. 13, 14, 15, 16. -A series of specimens in author's collection ranging from maximum to 



minimum size, from Lockport, all more or less flattened. 

 17,18. Two uncompressed specimens, anterior and posterior views; showing true contour of 



the crown in this species. Same collection. 



Niagaran, from the middle Third of the Rochester shale ; Silurian. New York and 

 Canada. 



Fig. 19. Lecanocrinus solidus Ringueberg 130 



Fig. 19. The type. Original of Ringueberg's fig. 4. Author's collection. 



Niagaran (lowest band of Rochester shale) ; Silurian. Lockport, New York. 



Figs. 20-25. Lecanocrinus waukoma (Hall) 140 



200. 6. Lateral and basal views of type, after Hall. From an internal cast, the plates being 



dissolved by chemical action. 

 21, 22. 23. Basal and lateral views of three specimens from Milwaukee, all internal casts, 



showing the concave base. Author's collection. 

 24a. b. Posterior and basal views of similar specimen with part of arms; — same locality and 



collection. 

 25. The largest specimen; figured by Weller, pi. 15, fig. 6. L^niversity of Chicago. 

 Niagaran (Racine) ; Silurian. Chicago, 111. 



Fig. 26. Lecanocrinus magnaradialis (Weller) 143 



Figs. 26a, 6, c. The type. Original of Weller's figure (as Ichthyocrvius) ; anterior, posterior, and 

 right posterior views. IBB entirely within column facet. University of Chicago. 

 Helderbergian ; Lower Devonian. New Jersey. 



Figs. 27-29. Lecanocrinus soyei Oehlert 142 



Figs. 270, 6. Posterior and summit views of type, after Oehlert: showing surface ornament; IBB 

 not visible in side view. (Musee d'Hist. Nat. Laval Mayenne, France.) 

 286. Posterior and basal views of less conical specimen in author's collection, with larger IBB. 

 Same locality. 

 29. Lateral view of smaller specimen with strong surface ornament. Same locality and 

 collection. 



Lower Devonian. Sable, France. 



