114 



THE MEDUSAE. 



Station 4670 

 Station 4671 

 Station 4673 

 Station 4673 

 Station 4673 

 Station 4680 

 Station 4682 

 Station 4702 

 Station 4708 

 Station 4710 

 Station 4712 

 Station 4714 

 Station 4716 

 Station 4718 

 Station 4724 

 Station 4735 

 Station 4741 



in trawl, from 320 fathoms ; 1, fragmentary. 



surface ; swarm, L. compacia stage. 



300 fathoms to surface. 



surface ; 2 large specimens, L. compacia stage. 



300 fathoms to surface ; 2. 



surface; 1 specimen. 



surface ; 2 specimens. 



surface ; 2 specimens. 



surface ; 6 specimens. 



surface ; swarm, L. rosacea stage. 



surface ; several. 



surface ; 1 large specimen, L. rosacea stage. 



surface ; 2 specimens. 



surface ; 1, fragmentary. 



300 fathoms to surface ; 1, 20 mm. in diameter. 



surface ; 2 specimens. 



surface ; 1 specimen. 



Acapulco Harbor ; surface ; many specimens, early stages and L. rosacea 



stage. 



The collection contains a series showing different stages in the development 

 of the gonads. The commonest condition, and one which from its resemblance 

 to the figures of Eschscholtz ('29, taf. 11, fig. 2) and Maas ('97, taf. 3, 

 fig. 7), we may term the L. rosacea stage, is represented in the photograph (PI. 

 3, fig. ?'). In a majority of cases the triangular form of the gonads showed 

 clearly; but in a few instances, apparently as the result of muscular con- 

 traction, the gonads are heart-shaped, the basal border being more or less 

 di i 'ply incised. The occurrence of a complete series connecting the two 

 forms demonstrates that Vanhoffen (': 02 b ) was correct in believing them 

 to be merely variations of one type. I never, however, observed truly ovate 

 gonads except in the case of very small individuals (PI. 4, fig. 3). It is most 

 interesting that the collection contains a number of specimens showing in a 

 typical degree the form of gonads believed by Maas ('93, : 05) to be charac- 

 teristic of L. compacia-, in which these organs are rhomboid, truncate, and in 

 contact with i mi' another; but since these were invariably the largest indi- 

 viduals, and since I found every conceivable grade between slightly truncate 

 tn ii jonads to pentagonal ones of an even more pronounced form than 



is shown in the photograph | PI. 3, fig. a), it seems to me clear that the latter 



