80 THE MEDUSAE. 



until it has been more fully tested on more extensive and better preserved 

 material. 



Whatever decision may eventually be reached as to the relationship of 

 these two species, the specimens in the present collection resemble Maas's 

 figures of A. grimaldii so closely that they are best referred to that species. 



Aeginura grimaldii Maas. 



Aeginura grimaldii Maas, : 04°, p. 38, pi. 3, figs. 19-28. 



? Aeginura weberi Maas, : 05, pp. 77, taf. 11, fig. TS, taf. 12, fig. 76, taf. 14, figs. 90-99. 



Plate 9, Fig. ^. 



Station 4646 ; 300 fathoms to surface ; 1 specimen, 21 mm. in diameter, ?. 



Station 4655; 300 fathoms to surface; 1 specimen, 20 mm. in diameter, 

 sex ? Very fragmentary. 



Station 4669 ; 300 fathoms to surface; 1 specimen, 13 mm. in diameter. 



Station 4676 ; 300 fathoms to surface ; 1 specimen, 16 mm. in diameter. 

 Fragmentary. 



All these specimens agree closely with Maas's (: 04") description of A. 

 grimaldii. In only one specimen, a female, can the sex be determined 

 from a surface view. In this individual (PI. 9, fig. ^) the eggs are very 

 large and irregularly distributed over the surface of the gastric pockets. 

 Another specimen, 13 mm. in diameter, appears from a surface view to be 

 a male, and in it the oral wall of the gastric pockets is uniformly thickened. 

 Apparently, then, here, as in Solmissus marshalli, the different arrangement 

 of the genital products which Maas (: 05) believed to be of systematic im- 

 portance is only a sexual difference. Unfortunately the margins of all the 

 specimens are so much damaged that I can give no detailed account of the 

 marginal organs, though it appears that in each octant there are three 

 structures of considerable size, corresponding to the secondary tentacles 

 described by Maas (: 05) iov A.ioeheri ; also in one specimen I found a single 

 otocyst, too fragmentary for any accurate description. No other marginal 

 organ was visible in that particular octant, so that I can say nothing as to 

 relative positions of secondary tentacles and otocysts ; probably, however, 

 they agree with Maas's description of A. tveberi. 



G astro-vascular system. — I was unable, on surface views, to demonstrate 

 the presence of any canal system, but the margins of all the specimens were 

 too fragmentary to settle this question definitely. The interradial incisions 



