228 Systematic Paleontology 



Description. — This species is readily separated from C. saffordi by its 

 more depressed form, larger and more open basal area, and the finely 

 granular nature of the plates of the outer integument. These granules 

 flow variously together and the plates are more or less stellate. In some 

 individuals this character is more marked than in others, so that the 

 degree of stellation is variable and individual, but it never takes place so 

 prominently as in some examples of C. ulrichi steUifer. 



The largest specimen has a diameter of 12.5 cm. 



This species also occurs rarely in the Maulius at Schoharie, New York. 



Occurrence. — Helderberg Formation, Keyser Member. Keyser, 

 West Virginia, below Gypidula zone, abundant ; Devil's Backbone, Mary- 

 land. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



Family ANOMALOCYSTIDAE 

 Genus ANOMALOCYSTITES Hall 



AnOMALOCYSTITES (?) DISPARILIS Hall 



Plate XXXII, Figs. 1-3 



Anomalocystites dispai-ilis Hall, 1859, Pal. N. Y., vol. iil, p. 145, pi. Ixxxviil, 



figs. 1-4, 1861. 

 Anomalocystites disparilis Woodward, 1880, Geol. Mag., dec. il, vol. vii, p. 193, 



pi. vi, figs. 2, 3. 

 Anomalocystites (?) disparilis Schuchert, 1904, Smith. Misc. Col., vol. xlvii, 



pt. ii, p. 207, text fig. 22. 



Description. — '' Body longitudinally subelliptical in outline (when 

 viewed from the anterior or posterior direction), concavo-convex, with the 

 margins strongly angular. Basal plates, or plates of the first series, on the 

 concave side, two, somewhat triangular and strongly curvilinear, together 

 giving a deep crescent-form outline to the base ; on the convex side, three 

 plates. Second range on the concave side, a single large plate which is 

 slightly curved on the lower side ; the lower angles truncate and the sides 

 vertical, one longer than the other, and unequally indented above for the 

 reception of two plates, and on the upper left-hand angle for the recep- 

 tion of an irregular plate. Third range consisting of three plates. Fourth 



