Maryland Geological Sukvey 237 



little abnormal material. One specimen has the amblacrum R IV abutting 

 against the lower pectini rhomb instead of passing to the left of it. In 

 another basally compressed individual, both ambulacra are bowed toward 

 the anal side, particularly E IV, causing the opposite side of the theca to 

 be more convex and almost angulated on the left. 



Length of the largest theca 32 mm.; greatest width 32 mm.; depth 21 

 mm. For general form, shape of individual plates and their ornamenta- 

 tion, see the figures and diagram, fig. 9. 



Occurrence. — Heldeeberg Formation-, Iveyser Mejiber. Keyser, 

 West Virginia. Common. 



Collection. — U. S. National MiiHenm. 



Fig. 9. — Analysis of Pseudocrinites gordoni Schuchert. 



Pseudocrinites subquadratus Schuchert 

 Plate XXXIV, Figs. 1, 2 



Pseudocrinites subquadratus Schuchert, 1904, Smith. Misc. Col., vol. xlvii, 

 pt. ii. No. 1482, pp. 234, 235, pi. xxxv, figs. 4, 5. 



Description. — Ambulacra prominent, rounded on the top, extending to 

 the column, composed of 26 comparatively stout basement plates bearing 

 13 brachioles on one side of each ambulacrum. Bracliioles short, very 

 slender, about 5 mm. long, and having about 10 plates in each column. 

 Ambulacral groove large. Ambulacralia not preserved. Pectinirhombs on 

 plates 1 and 5, 13 and 18, about equally large and having about 33 dicho- 

 pores, while that on plates 14 and 1.5 is largest and has 43. Madreporite 

 prominent, situated as usual on plate 18; the hydropore is very minute. 

 Anal area as in F. clarJxi, prominent, consisting of 2 circles of pieces, the 



