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SILURIC AND DEVON [C CYS'l [DEA 



265 



root member, where it branches and connects with the canals of all 

 the roots. The latter canals pass through all the bifurcations and 

 continue into the outer wall communicating with the open space be- 

 tween the two parts of the walls. In this way vascular and nervous 

 connection is maintained between all parts of the bull). 



The stalk is inserted into the root as a wedge (see figure 44). 

 The length of the stalk is unknown, as the bulbs never preserve a 

 piece longer than 15 mm. This part has thin segments, with the 

 articular surfaces radially stri- 

 ate, as in crinoids, and is pen- 

 etrated by a small round or 

 pentagonal axial canal, with 5 

 short linear radii. 



Attached to Camarocrinus 

 are sometimes found roots like 



, . • • 1 r Fig. 44. — Side view of the base of 



those of many crinoids, as, for c ^.^ showing how the stalk is 



instance, EucalyptOCrinUS, and we dged into the roots; the interior 



these at one time were SUp- canals of the roots are indicated by 



posed also to belong to this broken lines. X 2. 



genus, the bulb of course then being regarded as the theca of the 

 animal. These roots, however, belong to another crinoid, as the 

 sutures between the plates are not wavy as in" Camarocrinus. 



Genotype, C. stcllatus Hall. The above definition, however, is 

 based largely on C. ulrichi. 



Conclusions. — It has been seen from the remarks of Dr. Jahn that 

 he does not regard all the specimens of Lobolithus as belonging to 

 Scyphocrinus, but thinks that some may belong to other genera, and 

 that at times the former are found where the latter are unknown. 

 On the other hand, in America, no crinoids except Edriocrinus, which 

 is a stalkless form directly attached by the theca to foreign bodies, 

 are ever found associated with Camarocrinus, while no Scyphocrinus, 

 as defined by Zenker, are known on this side of the Atlantic. 

 Scyphocrinus Hall is a different genus and was proposed by that 

 author without knowledge of Zenker's previous use of the same 

 name. Then again, the widely differing geological horizons of occur- 

 rence between Bohemia and the Appalachians, and between the latter 

 and Tennessee and Indian Territory, make it certain that these bodies, 

 if they are root appendages, can not all belong to Scyphocrinus. In 

 Bohemia the fossils in question occur in the transition zone between 

 Barrande's division E ei and E e2, which in the American geological 

 sequence means about the Rochester shale. The next horizon in 

 which Camarocrinus is found is the Manlius, which is at die 



