﻿SCHUCHERT] SILURIC AND DEVONIC CYSTIDEA 2 7 l 



(== New Scotland), on Horse creek, near Chalybeate spring", and on 

 Tennessee river, near Pyburn landing, or opposite White Sulphur 

 spring. 3 Hall's material is from Hardin comity, Tennessee. Re- 

 cently Mr. 1\. S. Bassler found this species in beds of New Scotland 

 age, just below the Clear Creek chert along the Mississippi, north of 

 Cape Girardeau, Missouri. 



Cat. number 27,760, U. S. N. M. 



CAMAROCRINUS ULRICHI Schuchert 



(Plate XL, figures 6-8; Plates XLI-XLIII) 

 Camarocrinus ulrichi Schuchert, Amer. Geo]., xxxn, 1903, p. 239. 

 This species is more pyriform or balloon-shaped than C. saffordi, 

 and the theca is usually considerably pinched and prolonged basally 

 into a high collar, evidently for the greater protection of the basal 

 openings. The plates are very much as in C. saffordi, and where 

 stellation has not set in, they adjoin with very finely serrated sutures, 

 but the pores between the plates are much smaller and are far more 

 abundant than in the latter species. In some individuals stellation 

 begins by the insertion of small, spicular pieces between and around 

 the pore openings, and above the larger plates over the dome of the 

 theca. In different individuals is found nearly every stage of pro- 

 gression from the non-stellate form to the prominently stellate C. 

 ulrichi stcllifcr. This detail is more clearly shown in the illustra- 

 tions on plate xl. 



Young or small specimens of C. ulrichi have the depressed form, 

 with the large and not sharply delimited basal area of C. stcllatus, 

 showing progressive development toward a more balloon-shaped 

 theca, with a pinched and restricted basal termination. The largest 

 known specimen has a diameter of 12 cm. 



Formation and locality. — Very common in the lower portion of the 

 Helderbergian (Hunton formation) of Indian Territory, where Dr. 

 Ulrich found them at many localities for a distance of 100 miles. 

 Some of the best localities are 3 miles northeast and 4 miles south of 

 Daugherty, and ij4, miles and 2 miles south of Franks. 



It gives the writer great pleasure to name this species for its dis- 

 coverer, Dr. E. O. Ulrich, one of America's most distinguished 

 paleontologists, and an indefatigable collector. 

 Cat. numbers 35,082-35,085, U. S. N. M. 



^ee Foerste, Jour. Geo!., xi, 1903, pp. 683-685, 714. 



