ABYLA LEUCKARTII. 219 



larger is proportionately very broad; but the basal tooth and particularly the 

 pronounced serrations of the hydroecial wings suggest the conditions in the 

 corresponding regions in Ceratocymba (Bedot, :04, pi. 1, fig. 1). The siphon has 

 a well-developed basigaster, but neither it, nor the tentacle, shows any features 

 of special interest. The tentilla are of the ordinary Abylid type. On the 

 whole, the resemblance of the cormidium to Ceratocymba is so close that I have 

 no hesitation in identifying the latter as the free Eudoxid of Abyla leuckartii. 



Chun ('88, '97b) has already suggested that Iho polygastric stage of the 

 "Ceratocymba" Eudoxid would prove to be an Abylid, basing this view on the 

 remarkably close resemblance between the bracteal canals in Ceratocymba and 

 in the Eudoxid of Abyla irigona, though admitting ("97b) the possibility that it 

 might be derived from a Monophyid. Schneider ('98) as noted above, united 

 it previously with Abyla leuckartii, though he believed that the latter was a 

 Monophyid. 



Two species of Ceratocymba, C. sagittata (Quoy and Gaimard) Chun, 

 from the Atlantic, and C. asymmetrica Lens and Van Riemsdijk, from the Malay- 

 sian region, have been described. Lens and Van Riemsdijk (:08) refer the 

 specimens from between the Azores and Portugal, described by Bedot ( : 04) as 

 C. sagittata to their asymmetrica. 1\\ as much as they have had the opportunity 

 of examining well-preserved material of C sagittata, identified by Chun, I accept 

 their identification. The slight asymmetry of the descending posterior portion 

 of the bract which is already visible in the early stage described above, suggests 

 that it is asymmetrica. The facts that asymmetrica occurs side by side with ^4. 

 leuckartii in the Indo-Pacific region, that it was taken by the "Albatross," and 

 that both it and A. leuckartii are known from the Atlantic as well, is good 

 evidence that it is asymetrica which is the Eudoxid of leuckartii. 



The synonymy of the Eudoxid is : — Ceratocymba asymetrica Lens and Van 

 Riemsdijk. 



Ceratocymba asymmelrica Lens and Van Riemsdijk, : 08, p. 9, pL 1, fig. 2-5. 

 Ceratocymba sagittata Bedot, :04, p. 1, pi. 1, fig. 1, (non Chun, '88). 



It was taken at Stations 4667, 4669, 4671, 4673, 4708, 4715, 4723, 4725, 

 both in surface and in 300 fathom hauls. The total number of specimens is 

 fifteen. 



All the bracts, of which the largest was 19 mm., the smallest, 6 mm. long, 

 were in good condition. The large gonophores were all badly crushed and 

 distorted; but most of the smaller ones, 6-10 mm. long, were well preserved. 

 The form of the bract is characteristic, and shows the most important feature 



