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



aboul ■">!» mm. in diameter. The gonads may fold transverse!} 

 in a manner to suggest the gonads of Ptychogena. 



Pam. Eucopidae Gegenbaur, 1856. 

 Leptomedusae with closed statocysts and 4. rarely 5 "or 6, 

 unbranehed radial canals. 



Gen. Obelia Per. & Les., 181 9, 

 Eucopidae with many short, non-contractile tentacles; eight 

 statocysts on the inner side of the liases of adradial tentacles: 

 gastric peduncle and marginal cirri wanting; velum rudimen- 

 tary. 



Obelia purpurea, n. sp. 

 Fig. (i. 

 Umbrella very thin and flat. Manubrium small, cylindrical 

 or angular according to state of contraction, with four simple 



Fig. 6— Obelia purpurea. X IS. 



oral Lobes. Tentacles 110-160. one-fourth to one-third the diam- 

 eter of the umbrella in length. Statocysts each with single oto- 

 cyst. Gonads broadly ovate, one near middle of each radial 

 canal, usually in distal half. Manubrium, canals and gonads 

 yellow, liases of tentacles violet-purple. 



