82 DISCOVERY REPORTS 



In some Diphyid eudoxids there is, between the bracteal somatocyst and the basigaster of the gastro- 

 zooid, a cylindrical connecting piece (see Vogt, 1854; pi. 19, figs. 1, 12). In living specimens of 

 Chelophyes appendiculata which I anaesthetized at Villefranche, it measures o-6 mm. in length and 

 o-i mm. in diameter. To its middle and distal half are attached the successively developed gonophores. 

 This peduncle is the homologue of the central organ described above, and represents the remains 

 of the part of the stem to which the gastrozooid was originally attached, or perhaps the peduncle of 

 the gastrozooid. 



Nectopyramis natans (Bigelow), 191 lb, 

 = Archisoma natans Bigelow, 191 16. 



An eudoxid of this interesting Prayid was taken by 'Discovery II 'between 1650 to 950 m. at St. 1586, 

 off Italian Somaliland. The polygastric stage has never been recorded. I take this opportunity, 

 therefore, to mention two polygastric specimens, one taken by 'Discovery' at Station ioi, off South- 

 west Africa, in a closing net at a depth between 2480 and 2580 m. ; and the other by S.Y. 'Rosaura' 

 in 1937, at a depth between 750 m. and the surface, between St Paul and the Brazilian coast. 



Rlong 



C rod lot 



_--/ — C P c 



-Riot 



Rlong 



Crodd 



CpoCsom) 



Cz' 



Text-fig. 38. Nectopyramis natans, polygastric stage. A, foreshortened view 

 from lower end to show longitudinal ridges; B, dorso-lateral view, x 7. 



The eudoxid was described and figured by Bigelow (191 lb, 1913), and has been taken several times 

 since. 



Curiously enough the polygastric stage has much the same long-bow shape as the eudoxid. The 

 'Discovery' polygastric specimen is 2 cm. in length, shaped like a long-bow, pointed above at one end, 

 and truncate at the other. The hydroecium runs practically the whole length. At mid-length it contains 

 the large gastrozooid and tentacle, and what are probably the buds of a second and third. On the 

 dorsal surface are three longitudinal ridges extending from the apex to the nectosac, which lies 

 about a quarter of the total length above the posterior truncate end. There is also a pair of lateral 

 ridges running from the apex, past the nectosac to the truncated end. There is a single longitudinal 



