. NCh Text-fig. 53. Sulculeolaria angusta A, B, lateral and dorso-lateral views of holotype posterior nectophore, Brit. Mus. Reg. No. 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 ex

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. NCh Text-fig. 53. Sulculeolaria angusta A, B, lateral and dorso-lateral views of holotype posterior nectophore, Brit. Mus. Reg. No. 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.

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