SMmiSONIAN INSTITUTION 



PLATE I 



PACK 



Figs. 1-13. Lecanocrinus pusillus Hall 131 



(All ligurcs iiatiu'al size except where otherwise stated) 



Figs. 1(7,/). Anterior and posterior views of the type. (28th Regents Rep., pi. 15, figs. 2, 3, 4.) 

 Shows general form and proportions of calyx and anal plate. Am. Mus. Nat. Hist., 

 New York. Waldron, Indiana. 



2. Posterior view of abnormal specimen figured by Hall, supposing it to have two anal plates. 

 X 2. Same collection. Waldron, Indiana. 



3a. The only specimen found with arms preserved; complete crown with part of stem showing 

 alternating joints; lateral view as it lies in the matrix. N. Y. State Museum, Albany. 



Waldron, Indiana. 



3&. The same, drawn in erect position to show proportions of calyx and arms. 



4a. Basal view of specimen from Waldron, showing the shallow, saucer-shaped excavation for 

 the column. X 2. 



4&. Posterior view of same. X 2. 



4c. Surface showing the fine reticulate markings. 



5. Ventral view of another specimen at distal margin of RR, showing thickness of plates, 



wide fosspc at articular face, and great strength of calyx. X 2. Waldron, Indiana. 



6, 7, 8. Lateral views of three specimens from Waldron, shoAving slight variation in contour. 



X2. 



9. Specimen from Waldron with part of ra\-s in place, showing narrow calj'x and more acute 



anal plate than usual X 2. 



10. Basal view of abnormal specimen with 3 small IBEJ, and a fourth larger than the three 



combined. X 2. Waldron, Indiana. 



11. Specimen from the equivalent shales at Newsom, Tennessee, with higher anal plate than 



usual. X 2. 



12. 13. Two other specimens from Newsom with the usual form of anal. Fig. 13, X 2. 



Niagaran, Waldron shales ; Silurian. Indiana and Tennessee. 



Figs. 14-36. Lecanocrinus pisiformis ( Roemer) 135 



Figs. 14a, b, c. Anterior, posterior, and distal views of an average specimen with arms complete, 

 showing the great relative height of calyx to top of RR. X 2. 



15. Another and similar specimen. X 2. 



16. Flattened specimen with proximal part of stem, showing columnals of about uniform 



width. X 2. 



17. Posterior view of a specimen as usuall3' found. X 2. - . 



18. Ventral view of specimen at distal margin of radials, showing the relative thinness of the 



calyx wall (contrasting with that of L. t'lcsillus), and the fossae. X 2. 

 19-25. Basal views of a series of specimens, showing the constant abrupt indentation of the 

 column facet. X 2. Fig. 23, from the Gasport beds at Lockport, N. Y., varies from 

 the others in the larger IBB. Fig. 24 is erroneously printed 24&. 



26. Small specimen with RA smaller than usual. X 2. 



27. Small specimen with RA reduced to small triangle. X 2. 



28. 29. A small, and an average, specimen in which RA has entirely disappeared. X 2. 



30a, b. Roemer's type, posterior and basal views. It is in the condition of the last two, and 

 the base probably erroneously figured with 5 IBB, — the species being thus founded 

 upon an abnormal and probably weathered specimen. From the same locality as the 

 preceding, where the species is very abundant. Copied from Roemer. 



31, 32. Types of L. hemisphericus Rowley, from equivalent horizon in Perry County, Missouri, 

 probably of this species. Collection of Prof. R. R. Rowley. 



330, b. Specimen of similar type from the Laurel limestone at St. Paul, Indiana. Anterior and 

 jDosterior views of calyx. X 2. 



34. iNIuch larger specimen with arms complete, somewhat flattened, from the Louisville lime- 

 stone, near Louisville, Kentucky; probably a variety of this species representing a 

 mature stage. X 2. 



