EXPLANATION OF PLATES. 



PLATE 30.— Continued. PAGE 



MET ABLASTUS BIPYRAMIDALIS? Hall. Rowley. 96 



FIGS. 28,29,30-31. — Two side, ventral and dorsal 

 views of a fine specimen. 



ORBITREMITES GRANDIS, N. Sp. (Rowley.) 96 



FIGS. 34-35. — Side and summit view of the type 

 specimen. 



PENTREMITES GODONI, DeFrance. Rowley. ' 97 



FIG. 36. — A ground specimen showing the hydro- 

 spire tubes and lancet canals. 



FIG. 39. — Side view of a smaller specimen with sev- 

 eral stem joints attached. 



PENTREMITES PYRIFQRMIS, Say. Rowley. 97 



FIG. 37. — Side view of a large, broad specimen, 

 probably a good variety. 



FIG. 38. — Side view of a large fine specimen with 

 deep sinuses. 



FIGS. 40-41. — Side views of two interesting speci- 

 mens with stem joints attached. 



FIGS. 42-43. — Side and ventral views of an elongate 

 form, probably of varietal importance. 



FIGS. 44-45. — Ventral and side views of a small speci- 

 men probably of this species. 



I 



