i S 2 DISCOVERY REPORTS 



It is certain however, that specimens of Abyla spp. will not all fit neatly into Dr Sears's proposed 



categories. 



I have also re-examined the anterior nectophore recorded by me (1932) from the Great Barrier Reef. 

 The proportions of the pentagonal facet are 1/0-63, an< ^ I confirm that it belongs to A. haeckcli. It 

 happens to be another of those partly injured or disorganized freaks that Dr Sears has brought to 

 notice. 



Abyla ingeborgae Sears, 1953. 



Complete specimens of this species at 'Discovery' Stations 295 and 297 and at 'Discovery II' 

 Station 699, which enabled me to identify loose posterior nectophores (Text-fig. 78) from Stations 706 

 and 2639. Until the publication of Dr Sears's paper, I had identified all these Atlantic specimens as 

 A. haeckeli, but anterior nectophores of the two types, haeckeli and ingeborgae, can sometimes be 

 separated at once. A good figure of the full grown posterior nectophore of A. haeckeli is needed for 

 comparison with that of A. ingeborgae. 



ro./r_ 



-Rl. 



-R.n 



---Tad 



--Whydl. 



To. v.l. 



Text-fig. 78. A, B, posterior nectophores of Abyla ingeborgae Sears, x 3-8, from ' Discovery II' Sts. 706 and 2639 (1200-600 m.) 

 respectively, each associated with anterior nectophores of that type; C, basal view of posterior nectophore of holotype 

 specimen of Abyla schmidti Sears from 'Discovery II' St. 1581, x 4. 



The solution of this question of a distinction between A. haeckeli and A. ingeborgae may lie in the 

 fact that a species, whose distribution covers such a wide area as that including the N. Atlantic and 

 Indo-Malaysian oceans, may appear as a larger form in the N. Atlantic, and that problems in allometric 

 growth may be involved. Sulculeolaria biloba appears to be another such species. 



Ceratocymba dentata (Bigelow), 1918. (Plates X, XI.) 



This Abylid has been taken in the Indian Ocean only at 'Discovery II' Stations 1585 and 2696, 

 though ' Discovery II ' took it many times in the Atlantic. It has been recorded only by Bigelow (1918), 

 who made the original record of the species from two North-west Atlantic Stations, about 3 2 N. lat. 

 and 70-72 W. long., and by Moser (1925) west of the Cape Verde Islands under the synonym Abyla 

 quadrat a. 



