GALEOLARIA MONOICA. 239 



Another distinctive feature is that the posterior nectophore has lateral 

 ridges, or wings (Plate 6, fig. 3, R. L.). The specimens had lost all but the 

 basal end of the stem when taken, so I can give no description of the various 

 appendages. 



Galeolaria monoica Chun. 

 Plate 6, figs. 4-9. 



Epibulia monoica Chun, '88, p. 1157. 



Galeolaria monoica Chun, '97b, p. 17; Lens and Van Riemsduk, ; 08, p. 60, pi. 9, fig. 76 77. 



Diphyes hiloba, Schneider, '98, p. 86 (partim). 



This species was taken at Stations 4592, 4617, 4634, 4635, 4640, 4644, 

 4646, 4681, 4691, 4700, 4702, 4716, 4718, both on the surface and in hauls from 

 300 fathoms to the surface. The material consists of twenty-seven loose anterior 

 nectophores and thirty-one loose posterior nectophores. The identification 

 of the latter rests partly, on their occurrence side by side with the anterior 

 nectophores, often in pairs with them; but chiefly on the fact that they differ 

 in several structural particulars from the posterior bells of any other known 

 species of Galeolaria. These grounds taken together are sufficient demonstra- 

 tion of identity with G. monoica. 



Although the original description of this species by Chun is very brief, 

 Lens and Van Riemsdijk have pointed out that he mentions two important 

 characters, namely, that the somatocyst is minute, and that the development 

 of basal teeth is unusually complex. Unfortunatelj^ Chun ('88, p. 1158) does not 

 describe the teeth further than to mention an "abweichende Bildung der sogen- 

 annten Verschlussklappen am Schirmrande." Lens and Van Riemsdijk (:08, 

 p. 60) identify two badly preserved nectophores taken by the "Siboga" as 

 G. monoica, on account of the extraordinarily small size of the somatocyst and 

 the complicated structure of the teeth. 



Fortunately the present series includes many excellent specimens both of 

 anterior and of posterior nectophores, and these agree closely with the "Siboga" 

 material. It is true that the basal teeth of the anterior nectophores (Plate 6, 

 fig. 6) differ in dorsoventral orientation from I^ens and Van Riemsdijk's account, 

 the single odd tooth being dorsal instead of ventral as they describe it. But 

 their own figure of the lateral aspect (Plate 9, fig. 76) shows ventrally a pair 

 of flaps, just as in the specimens studied. From this it appears that the terms 

 "dorsal" and "ventral" were accidentally transposed in their description. 



In both "Siboga" and "Albatross" specimens, then, the anterior necto- 

 phore has a pair of large ventral flaps or wings, which may or may not overlap. 



