PEGANTHA TRILOBA. 89 



the genital prominence is much smaller than in the individual just described. 

 In another specimen from the same collection however, the lateral lobes show 

 a considerable amount of secondary lobing. In specimens about 12 mm. in 

 diameter (of which the Hawaiian collection contains several) the gonads are 

 very small ; each, however, already consists of three distinct lobes. Mayer's 

 figure (: 06, pi. 3, fig. 8) is incorrect in that it represents the gonads as lying 

 at about the mid zone of the stomach surface. In reality they are at its 

 margin and hang into the lappet cavities, in the Hawaiian as well as in 

 the Eastern Pacific specimens. Our small specimens show no trace of 

 gonads. 



This conformation of the gonads agrees with Haeckel's ('79) account in 

 its main feature, i. e. the three-lobed condition ; it difEers, however, in that 

 Haeckel described and figured the lobes of the gonad as rounded, smooth, 

 and without subdivisions ; but since his account was taken from alcoholic 

 specimens it is doubtful whether it represents the normal aspect of the 

 organ. 



Color. — The entire Medusa (adult) is of a delicate violet pink (PI. 14, 

 fig. 3), the endoderraal system being more deeply tinted and more opaque 

 than the remainder of the bell. The distal portions of the exumbral ridges 

 and the otoporpae are deep purple. These purple exumbral lines were 

 observed by Mayer ': 06, p. 1140), but he failed to realize their connection 

 with otoporpae. 



Tliere seems to be no doubt as to the identity of this form with P. triloba 

 Haeckel, the only divergence from Haeckel's account, apart from a slightly 

 greater number of tentacles in some specimens, being that in the present 

 series the lateral lobes of the gonads may be secondarily lobed. This differ- 

 ence, however, cannot be of specific significance, in view of the fact that 

 gonads of different individuals vary widely in this respect, even, indeed, to 

 the extent of lacking the secondary lobing altogether, as is the case in 

 one of the Hawaiian specimens. I have been able to examine a specimen 

 collected by the " Hassler" expedition at Rio Janeiro, which in number of 

 otocysts, sculpture, etc., so closely agrees with the "Albatross" and Hawaiian 

 specimens that I have no doubt of their identity. In the " Hassler " specimen 

 however, while most of the gonads have three lobes, one has four. It is 

 this fact which has made me discard the character, three or four lobes, as 

 a specific one and to class P. qiiadrlhba as a synonym of P. triloba. The 

 same conclusion might be reached, perhaps, in the case of P. biloba Haeckel, 



