. Text-fig. 72. Thalassophyes crystallina. A, lateral view of specimen from 'Discovery II' St. 1588, 500-200 m., x 16; B, C, lateral and ventral views of a specimen from 'Discovery' St. 102, 750-500 m., x 16. The nectosac in this species is only half the length of the nectophore, and the dorsal extension of the somatocyst is found just above its apex. Comments have been made above, in the notes on Heteropyramis maculata, upon the close relation- ship between the two species. ABYLIDAE I recognize the family Diphyidae to be distinct from the Abylidae, which contains two subfamilies: (1) Abylinae
. Text-fig. 72. Thalassophyes crystallina. A, lateral view of specimen from 'Discovery II' St. 1588, 500-200 m., x 16; B, C, lateral and ventral views of a specimen from 'Discovery' St. 102, 750-500 m., x 16. The nectosac in this species is only half the length of the nectophore, and the dorsal extension of the somatocyst is found just above its apex. Comments have been made above, in the notes on Heteropyramis maculata, upon the close relation- ship between the two species. ABYLIDAE I recognize the family Diphyidae to be distinct from the Abylidae, which contains two subfamilies: (1) Abylinae (for Abyla and Ceratocymba), and (2) Abylopsinae (for Abylopsis, Bassia and Enneagonum). On 15 June 1953, when I was awaiting the galley-proofs of this report, I received Dr Mary Sears's ' Revision of the Abylinae' of which she had already been kind enough to allow me to see an advance copy. I had tried to persuade Dr Sears not to publish the descriptions of what I believe to be eight abnormal specimens as the type material of new species and genera. The new names in question are: (1) Pseudabyla irregularis; (2) Pseudabyla dubia; (3) Pseudocymba asymmetrica; (4) Pseudocymba
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