EXPLANATION OF PLATES. 



PLATE 36.— Continued. PAGE 



PENTREMITES KONINCKANUS, Hall, Rowley. 126 



FIG. 45 — Side view of a specimen with several stem joints attached. 



CARPENTEROBLASTUS VERYl, N. Sp., (Rowley.) 127 



FIGS. 46, 47-48 — Side, summit and basal views of the type specimen. 



METABLASTUS NITIDULUS, M. & C. Rowley. 128 



FIG. 49 — Side view of a specimen from Lanesville, Ind. 



CODASTER ATTENUATUS, Lyon, Rowley. 128 



FIGS. 50-51 — Summit and side views of a "four-sided" specimen. 

 The ventral surface of the specimen is poorly preserved. 



NUCLEOCRINUS VERNEUILl, Troost, Rowley. 128 



FIG. 52 — Summit view of a specimen preserving the integument of 

 ventral cover plates. 



FIG. 53 — Side view of a smaller specimen in which the anal plate is 

 abruptly prominent near the summit. 



FIG. 54 — Side view of a specimen showing at "a" the tunnel beneath 

 the ventral roof connecting the ambulacral groove with the vis- 

 ceral cavity. 



FIG. 55 — Summit view of a specimen approaching iV. riieloniform'is. 

 This specimen also shows the same features as Fig. 52. 



FIG . 56 — Enlarged view of a group of hydrospires of verneuilL 



NUCLEOCRINUS GREENEI, M. & G., Rowley. 128 



FIG. 57 — Inverted basal view of a specimen to show the convex base. 



