Maryland Geological Survey 



239 



restricted to the posterior half. Because of this close resemblance the 

 writer regards the present specimen as abnormal in development, or a 

 monstrosity, but thinks it best to give it a name, for easy reference. Were 

 it not for the very close identity in all specific characters save the abnormal 

 position of the basal pectinirhomb, one would be led to distinguish P. ah- 

 normalis as the type of a new genus. That the position of the basal 

 pectinirhomb is abnormal is shown by the shape of plate 1, but especially 

 by plate 6, which is notched to receive all the anterior edge of plate 1. 

 Length of the only specimen, 29 mm. ; width 22 mm. ; depth 14 mm. 



2 J \ J 

 Fig. 10. — Analysis of Pseudocrinites abnormalis Schuchert. 



Occurrence. — ^Heldekbeeg Formation, Keyser Member. 

 West Virginia. 



Collection. — U. S. National Museum. 



Keyser, 



Pseudocrinites stellatus Schuchert 



Plate XXXIII, Figs. 13, 14; Plate XXXV, Fig. 7 



Pseudocrinites stellatus Schuchert, 1903, Amer. Geol., vol. xxxii, p. 236. 

 Pseudocrinites stellatus Schuchert, 1904, Smith. Misc. Col., vol. xlvii, pt. ii. 

 No. 1482, pp. 232, 233, pi. xxxv, figs. 8, 9; pi. xxxix, flg. 7. 



Description. — Ambulacra well defined, flat topped, extending around 

 the entire periphery of the theca and touching the column. Ambulacrals 

 large. Each ambulacrum in full-grown specimens has about 36 

 brachioles; in a small specimen having a thecal length of 15 mm., there 

 are but 24 brachioles. Brachioles iisually not preserved. Ambulacral 

 groove wide, roofed by a median double row of tiny angular ambulacralia 



