14 University of California Publications in Zoology. [Vol.6 



pigmented endoderm cells and no nematoeysts in the ectoderm, 

 presenting a definite contrast with the tentacles in these respects. 

 The cordylar bases grade in shape and structure into tentacle 

 bases, and are grouped according to size like developing ten- 



Fig. 2. — P. calif ornica. Portion of the margin enlarged, 

 showing tentacle bases and cordyli. 



tacles, the middle one of a group of three being the largest. 

 The cordyli spring from the inner angle of their rather obtuse 

 distal ends, like tentacle filaments. Structurally I have not 

 been able to establish a transition between them and the latter. 



The presence of raised liases for the cordyli in P. californica 

 is exceptional among the species of Ptychogena. The resem- 

 blance of these bases to tentacle bases suggests a comparison with 

 Staurophora, where, according to Hartlaub (1897), the cordyli 

 develop into tentacles. 



Pam. I'olyorchidae A. Ag., 1862, s. < m. 



Leptomedusae with deep bells, four radial canals with nu- 

 merous blind lateral branches, some or all of which may project 

 as long tubular gonads into the subumbrellar cavity; tentacles 

 uumerous, hollow; ocelli present. 



Gen. Scrippsia, n. gen. 



Polyorchidae with gastric peduncle, lateral branches of tin- 

 radial canals in the form of numerous long tubular gonads from 

 the peduncular portion of each radial canal; tentacles numerous 

 in several cycles. 



This genus may be distinguished from its nearest relative. 

 Polyorchis, by the gastric peduncle and the absence of pinnately 

 arranged branches of the radial canals distal to the gonads. 



