l6 SMITHSONIAN INSTITUTION 



PLATE V 

 (All figures natural size except where otherwise stated) 



^ PAGE 



Figs. 1-3. Mespilocrinus forbesianus de Koninck and Le Hon 192 



» 



Figs. \a. b. The principal type specimen, after de Koninck and Le Hon, pi. 2, figs. 10, c; left posterior 



and posterior views, " somewhat enlarged," showing dextrose twist of arms, and 



unequal sides of IBr. Musee Royal d'Hist. Nat. Bruxelles. 

 2. Basal view of another specimen from the same locality and collection. By oversight, or 



owing to obliteration of sutures, the infrabasal disk is drawn as if it were undivided, 



although the generic diagram based upon these specimens shows the usual three plates. 



After de Koninck and Le Hon. Enlarged. 

 3a. Mature specimen with complete crown and part of stem, lateral view. The short columnals 



extend farther down than in the American species. British Museum Nat. Hist., 



No. 40125. 

 3&. The same crown placed in a more erect position. 



Lower Carboniferous, Tournai Stage. Tournai, Belgium. 



Figs. 4-15. Mespilocrinus konincki Hall 194 



Fig. 4. The type, with crown drooping upon the stem ; showing rapid lengthening of columnals. 

 From a cast in Am. Mus. Nat. Hist., New York. 



5. A specimen of average size, with drooping crown and nearly complete stem ; showing the 



change in columnals from very short, cylindrical disks to very long spindles, ten times 

 as long as their diameter at the sutures. 



6, 7. Similar specimens. 



8. Similar but very young specimen ; the long columnals beginning much nearer the calyx 



than in the others. X 2. 

 ga, b. Posterior and basal views of small crown. X 2. 



10. Distal view of similar specimen showing twist of arms. X 2. 



11. Basal view of very small specimen with S IBB. X 2. 



12. Large specimen, somewhat flattened, from r. post, radius. X 2. 



13a, b. R. ant. and 1. post, views of large, slightly flattened specimen ; showing the unsym- 

 metrical RR and Br, and the wedge-forra columnals due to fixed curvature of the 

 stem. X 2. 



14a, b. The type of M. scitulus Hall, showing 5 unequal IBB ; posterior and basal views. 



15a, b. Posterior and basal views of specimen from Sedalia, Missouri, figured by Miller and 

 Gurley as M. blairi; Bull. 111. St. Mus., pi. 4, figs. 13-15. 

 Lower Burlington limestone ; Lower Carboniferous. Burlington, Iowa. 



.'VU specimens except that of figures 4, 14 and 15, are in the author's collection. 



Figs. 16-19. Mespilocrinus blairi (Miller and Gurley) ig6 



Figs. 160, b. The tjrpe; basal and posterior views showing 5 IBB. After Miller and Gurley. Loca- 

 tion of specimen unknown. 

 17a, b. Posterior and distal views of specimen figured by Miller and Gurley, Bull. 8, 111. St. 



Mus., pi. 3, figs. 13, 14. After Miller and Gurley. 

 18, 19. Two specimens from the same horizon and locality as the preceding, now in the Uni- 

 versity of Chicago ; showing the usual 3 IBB. 

 Choteau beds ; Lower Carboniferous. Sedalia, Missouri. 



Fig. 20. Mespilocrinus thiemei n. sp 198 



Fig. 20a. The type, anterior view; IBr narrower than in the other species. X 2. Author's col- 

 lection. 

 20&. Posterior view of same ; anal x very short, probably followed by others. X 2. 

 Lower Burlington limestone; Lower Carboniferous. Burlington, Iowa. 



