94 SMITHSONIAN INSTITUTION 



PLATE XLIV 

 (All figures on this plate except gc are natural size) 



PAGE 



P'igs. i-S. Wachsmuthicrinus spinifer (Hall) 331 



Fig. la. A nearly perfect mature specimen with stem attached. Has large iBr and illBr ; spines 

 on axillary IBr; ramules, after first two or three, on every second brachial. Original 

 of Meek and Worthen, Geol. Surv. 111., V, pi. 4, fig- i- Mus. Comp. Zool. 

 lb. Basal view of same, showing IBB entirely within ring of non-differentiated BB. 



2. Broken specimen, with part of rays well preserved, showing extreme size of spine on 



axillary IBr. Author's collection. 



3. Very young specimen, with iBr and large spines. Author's collection. 



4. Base of broken specimen from Lake Valley, New Mexico ; one ray showing axillary spine. 



Author's collection. 



5. Isolated axillary plates, from Kinderhook beds at Fern Glen, Missouri, showing existence 



of a similar species there. Author's collection. 



Lower Burlington limestone ; Lower Carboniferous. Burlington, Iowa, except as 

 otherwise stated. 



Figs. 6-7. Wachsmuthicrinus bernhardinae n. sp 332 



Fig. 6. A very mature specimen, with numerous iBr and illBr passing into perisome; very small 



spines on axillaries ; ramules mostly on every second brachial. Author's collection. 



ya. Lateral view of isolated base and RR of another specimen ; showing normal shape of RR 



and the deep patelloid sockets. Author's collection. 

 76. Basal view of same, showing proportions of BB and RR ; IBB covered by top columnal. 

 "c. Interior view, showing IBB ; the semi-circular marks represent indentations on the inner 

 surface, rather fainter than the drawing shows. 

 Lower Burlington limestone; Lower Carboniferous. Burlington, Iowa. 



Fig. 8. Wachsmuthicrinus iowensis n. sp 333 



Fig. 8. Oblique basal view of crushed specimen ; showing very large first iBr, and widely diver- 

 gent rays. Author's collection. 



Upper Burlington limestone ; Lower Carboniferous. Burlington, Iowa. 



Fig. 9. Wachsmuthicrinus ponderosus n. sp 333 



Fig. ga. A large specimen perhaps of this genus ; with lower part of crown broken away. British 

 Museum, No. 75696. 

 9&. Outline of plates of opposite side, from impressions of suture lines on the internal cast. 

 gc. Detail of surface marking on unworn part of a higher brachial. 

 Lower Carboniferous. Sedbury, England. 



