186 



Papers from the Department of Marine Biology. 



renders an attempt to study it unsatisfactory in many respects. The bell 

 appears to have been about 200 mm. wide, exumbrella finely granular, with a 

 central dome as in Cotylorhiza tuberculata. 



There are 8 rhopalia without ocelli (in formalin), and without exumbrella 

 pits, being similar in essential respects to those of Cotylorhiza tuberculata. 

 The rhopalar lappets are short and pointed. There are about 8 irregularly 

 spaced, bluntly pointed, large velar lappets in each octant, and deep furrows 

 between them extend radially inward over the exumbrella, as in C. tuberculata. 

 The velar lappets vary in length, but the largest are about twice as long and 

 twice as wide as the ocular lappets. 



B 



FIG. 4. Cotylorhiza pacifica, sp. nov. 



A. View of an octant of the bell-margin seen from the exumbrella side. 



B. Abaxial view of one of the mouth-arms. 



The circular muscles occupy the entire zone of the subumbrella beyond the 

 arm-disk. They are broken in the 8 principal radii, and unlike C. tuberculata 

 there are no radial muscles. 



The arm-disk is about 100 mm. wide, the perradial columns being each 36 

 mm. wide. The subgenital ostia are much larger than in C. tuberculata, but 

 they were so mutilated that one can not state their exact size, which appears, 

 however, to be nearly that of the perradial columns themselves. The speci- 

 men having been cut into pieces, we can make no statement concerning the 

 condition of the subgenital porticus. 



