C. Wachsmuth—Structure of Paleozoic Crinoids. 127 
tinct branches, This be in some instances the result of 
accidental development, but is more frequently due to an ob- 
struction of the anal canal. found a specimen nus 
caused the destruction of an entire ray, the plates of which are 
bulging out, forming together with the anal plates, and inter- 
poboacis of this species, a large elongated cavity with a rather 
arge aperture. All these instances give evidence of a pressure 
from within, and indicate that the outside opening of Paleozoic 
Crinoids was solely an ejective organ, and could not have had 
toward the posterior side, and the development of the abnormal 
roboscis occurs invariably in the anal series. It is therefore 
ardly necessary to argue on Dr. White's supposition that the 
abnormal second proboscis, wherever it occurs, might have 
Served as buccal orifice, as such a theory is unsupported by 
analogy, 
: (To be continued.) 
