﻿2/0 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



This species is readily separated from C. saffordi by its more de- 

 pressed form, larger and more open basal area, and the finely granu- 

 lar 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 stcllifcr. 



Formation and locality. — Not common in the Tentaculite limestone 

 of the upper Manlius at Schoharie, New York. Rare in the lower 

 portion of the same formation at Devil's Backbone, near Cumber- 

 land, Maryland, and very common near the middle of the Manlius 

 in the quarries of the B. & O. R. R. near Keyser, West Virginia. 

 The largest specimen has a diameter of 12.5 cm. 



Cat. numbers 35,080, 35,081, U. S. N. M. 



CAMAROCRINUS SAFFORDI Hall 



(Plate XL, figure 10) 



Camarocrinus saffordi Hall, Twenty-eighth Rep. N. Y. State Mus. Nat. 

 Hist., Mas. ed., 1879, p. 208, pi. 36, figs. 1-6; pi. 37, figs. 1, 2. Ex- 

 tract, 4 , 1880, p. 6, pi. 36, figs. 1-6; pi. 37, figs. 1, 2. 

 Camarocrinus clarkii Hall, ibidem, p. 209, pi. 36, figs. 7, 8; pi. 37, fig. 3- 

 Extract, p. 7, pi. 36, figs. 7, 8; pi. 37, fig. 3- 

 This species is distinguished from C. stellatus by the more elevated 

 or balloon-shaped theca, as well as by the serrated suture lines of the 

 plates and the few scattered openings between the latter. C. clarkii 

 is not a good species, as large collections show considerable variation 

 in the form, but more particularly in the number of camara in all the 

 species. It is simply an unusually lobate specimen having 1 1 cham- 

 bers. C. ulrichi is still more balloon-shaped, with the outer integu- 

 ment basally extended into a high collar, and with numerous minute 

 pores at most of the angles of the thecal plates. 



Formation and locality. — In western Tennessee there appears to 

 be no zone equivalent to the New York Manlius, as the Meniscus, or, 

 rather, Foerste's Brownsport limestone, is immediately followed by 

 the Linden or Helderbergian of about the age of the New York 

 Uppermost Coeymans or basal New Scotland. In 1897 the writer 

 found three specimens of C. saffordi at Allen's Mill, on the Birdsong, 

 in Benton county, but the exact equivalent for the horizon of these 

 fossils in the New York section remains undetermined. During the 

 year 1903 Mr. Foerste collected many specimens of this species in 

 unmistakable Helderbergian strata of the age of the New Scotland. 

 These were collected in the lower 50 feet of the Linden formation 



