PLATE 48. 



Fig. 1. 599. 1. Stefhanocrinus akgulatus. ( Pag. 212.) 



1 a. A specimen of the ordinary form and proportions, having a part of the column attached. 



1 6. A specimen more elongated, and somewhat flattened. 



1 c. A specimen with very prominent carinas. 



1 d. A similar larger specimen, with the body somewhat rotund and the carinse very strong. 



1 e. Three of the costal plates arranged laterally, showing the single and two converging carinas, and the 

 succeeding coronal plates. 



1 /. The lefthand side of one of the heptagonal pelvic plates, above which the costal plates divide, showing 

 one of the carinas extending from the base obliquely to the summit. 



1 g. The base of a specimen, showing the three divisions, and the depression for the attachment of the column, 



1 h. Figure showing the form and arrangement of plates of the body. 



1 i. The crown, as it usually appears when destitute of the plates, diverging from and supporting the cen- 

 tral proboscis. 



1 k. The crown, preserving the plates as described above. 



1 I. An enlarged figure, showing the structure and arrangement of the plates forming the summit. 



1 7ft. A transverse section at the base of the costal plates, showing the subdivisions of the plates, and the 



projecting angles of the carinse. 



Fig. 2. 600. 2. Stephanoceinus gemmiformis. { Pag. 215.) 



2 a. An individual somewhat larger than the ordinary size, 

 2 6. A specimen with a few joints of the column attached. 

 2 c. The crown of an individual, as it is usually seen. 



2 d, e. The base of one of these, and the same enlarged, showing the rapidly expanding form which becomes- 



nearly round or very obtusely pentagonal at the centre, 

 2 /. The structure of this species as shown from fig. 2 a 



