CHUNIPHYES MULTIDENTATA. 263 



and with its deepest point, at which the stem is attached, at about its mid-level. 

 In the "Siboga" specimens it apparently extended nearly to the apex, but 

 this was no doubt due to their fragmentary condition. The hydroecium shows 

 some resemblance in general outline to the corresponding structure in Diphyes 

 arctica (Chun, '97b, pi. 1, fig. 4). 



Nectosac. This structure, wholly destroyed in the "Siboga" material, is in 

 fair condition in one of the "Albatross" specimens, as it was also in the Bis- 

 cayan collection. It is short, reachhig only shghtly above the mid-level of 

 the nectophore, and rounded at the top; of about the same diameter throughout 

 its length. In the Biscayan specimens it is proportionately slightly longer, 

 though of the same general form. But in view of the possibility of distortion 

 due to contraction so slight a difference can not be considered as indicating the 

 existence of two separate species. In one individual the canals, though much 

 damaged, could be traced throughout most of their extent. In the figure (Plate 

 8, fig. 9) they are necessarily somewhat reconstructed. 



Somatocyst. In the only specimen in which this structure was in good 

 enough condition to describe, it becomes dilated shortly above its point of origin 

 (Plate 8, fig. 9) ; but then narrows once more to become tubular. It extends 

 very nearly to the apex. In the other specimens its length is equally great; 

 but in them its central region is entirely destroyed. 



In the Biscayan specimens the dilation, present in all is transversely pro- 

 longed into a horn on either side (Bigelow :11b). But since these horns show 

 various gradations in size, and are very small in one example, I doubt whether 

 any sharp line can be drawn between specimens where they are present and 

 those in which the dilation is a simple spheroid. 



The "appendage, so strangely divided into three" described by Lens and 

 Van Riemsdijk (: 08, p. IS)* and provisionally identified by them as the somatocyst 

 was in reality three distinct structures, viz., the basal part of the somatocyst, 

 the pedicular canal of the inferior nectophore from which the latter was detached, 

 and the proximal end of the corresponding canal of the superior nectophore 

 (Plate 12, fig. 6). 



Nothing is left of the stem but the proximal end, and a number of immature 

 siphons. 



Inferior nectophore. The inferior nectophore of the complete specimen, 

 though attached when taken, was broken off before it reached Cambridge. 

 Fortunately, however, a sketch of the position was made before preservation, 

 and the accompanying figure (Plate 8, fig. 9) is based on this. As observed 



