SYSTEMATIC AND BIOLOGICAL ACCOUNT 109 



The type material was taken by R.R.S. 'Discovery II' at Station 1586 in an oblique haul from 

 550 m. to the surface, and consisted of twenty-seven anterior nectophores and twenty posterior, of 

 which I select one posterior nectophore Brit. Mus. (Nat. Hist.) Register No. 1950. 6. 20. 1 as the 

 holotype. It is not possible to select an anterior nectophore as well, because we do not know for 

 certain whether any were connected in life with the holotype. Seven posterior nectophores were 

 taken also at 'Discovery II' Station 1374 in an oblique haul from 230 m. (off the coast of Natal). 

 The posterior nectophore figured by Candeias (1929, fig. 6) probably belongs to this new species. 



2 mm.\ 



NCh 



Text-fig. 53. Sulculeolaria angusta sp.n. A, B, lateral and dorso-lateral views of holotype posterior nectophore, Brit. Mus. 

 Reg. No. 1950.6. 20. 1., 'Discovery II' St. 1586,550-001., x 8-5 ; C, anterior nectophore probably of this species, 'Mabahiss' 

 St. 61, night, o m., x 8-5. k-e = baso-ventral sector. 



Sulculeolaria quadrivalvis Blainville, 1830. 



The question whether Sulculeolaria quadrivalvis and S. quadridentata are synonyms of one and the 

 same species was last reviewed by Bigelow & Sears (1937). 



They concluded (1) that there was an unbridged gap between the bidentate and the extreme 

 quadridentate forms of the anterior nectophore; (2) that the bidentate form occurs in both sexes, 

 and that the only quadridentate colonies of which the sex has been definitely determined chanced 

 to be female; (3) that it is possible that the quadridentate form is a sport that appears more often in 

 female than in male colonies ; (4) that it seems wisest to recognize two species. 



