294 DISCOVERY REPORTS 



North Atlantic between the Azores and Bermudas, at 0-3000 m. (Pruvot-Fol, 1926). 

 Yokohama to Honolulu, lat. 35° 13' N, long. 154° 43' W (Pelseneer, 1887, under 

 C. modesta). 



Family CLIONIDAE 



Genus Clione, Pallas, 1774 



Clione antarctica, E. A. Smith, 1902; Eliot, 1907. 



Clione Umacina var. antarctica, Meisenheimer, 1906. 



2c6 specimens from thirty-six stations. Nearly half the hauls from near South Georgia, the re- 

 mainder from an area between the South Sandwich Islands and Bouvet Island. 



The specimens range in length from 1-5 to 18 mm. They vary greatly in shape and 

 colour, some of them being without the usual ruddy hue. The largest number in a haul 

 (forty-five) occurred at night at the surface (0-5 m.), over soundings of 1000 m. Larvae 

 of 3 mm. and less occurred in one October, three November, two December and two 

 February hauls. Most of the hauls in which C. antarctica occurred were made in No- 

 vember, December and January. The species was absent in a number of February and 

 March hauls made in the South Orkneys, South Shetlands and Palmer Archipelago in 

 1927, although the gear and the depth over which the nets were worked would seem to 

 be quite suitable. The species occurred, however, in an April haul made at the South 

 Shetlands in the same year. 



This family is without a glandular dorsal pit and has no suckers. Buccal cones are 

 generally present. There is no lateral gill and rarely a posterior gill. In Clione a posterior 

 lobe is present in the foot. It is usually short and broad. There are no chromatophores. 

 The hook sacs contain numerous long hooks. Radula at least 6-1-6. The present species 

 is very closely allied to C. Umacina, Phipps. Eliot (1907, p. 13) gives a list of differences 

 between the two species. As observed in Terra Nova specimens (Massy, 1920), there is 

 a distinct neck behind the fins, instead of between or above them, as in C. Umacina. The 

 skin appears to be thicker and larval rings persist to a later age. 



Distribution. Antarctic seas. 



Subfamily THLIPTODONTINAE 

 Genus Thliptodon, Boas, 1886 

 Thliptodon gegenbauri, Boas, 1886. 

 Thliptodon atlanticus. Massy, 1917. 

 St. 72. 4-5 m. tow-net, 2000 (-0) m. : 4 specimens. 



In this subfamily proboscis, gill and jaw are absent. Teeth of three sorts — formula 

 3-1-1-1-3 — and gullet bladders (vesicules buccales, Schlundblasen) are present. 



Genus Thliptodon, Ggbr. No cones : hooks present : the lateral lobes of foot sometimes 

 separated from the posterior lobe ; pockets exist in the folds of the skin in which the lobes 

 can be withdrawn. 



