JRevietPs — Wachsmuth 8f Springer's Monograph on Crinoids. 33 



BA 



I ir III 



Fig. 3. — TJlocrinus (diagrammatized from Miller & Gurley ; x f). 

 Posterior view of cup of U. Buttsi. Xote that x is not so far remoTed from 

 post. B. as in II, U. kansasensis, posterior vie-w. III. The same seen from 

 above, showing the upper surface of x, which must have supported tube-plates. 



f:c)i^ 



mwswo 



Fig. 4. — Merocrinus. 



Fig. 7. — Somocrinus. 



l^"t feoS'-ant Ant 



Fig. 5. — Beterocrinus bellevillensis. 

 (Outline after W. & Sp.) 



%<WZ<W^ 



Fig. 8. — Zeacrinus. 



P^^PS^ m^=m^ 



Fxg. 6. — Hijhocrinus. Fig. 9.— De/omm<s (=CmomwMs, "White). 



(Outline after W. & Sp.) 

 In all these analyses (Figs. 4-9) the orientation is that of Fig. 5. The plate x of 

 Figs. 3, 5, and 6 is called i by W. & Sp. In Fig. 4, t denotes the anal tube. 



Fig. 10. — Migration of the anal in Antedon (after W. B. Carpenter & M. Sars). 

 Originating between the radials, the plate x gradually moves upwards, 

 eventually atrophying till only two small fragments remain at the base of the 

 anal tube {t) . The dotted lines in the left-hand figure show the course, of 

 the gut. " 



DECADE IT. VOL. VI. — NO. I. 3 



