290 DISCOVERY REPORTS 



Genus Spongiobranchaea, d'Orb., 1840 

 Spongiobranchaea australis, d'Orb., 1840. 

 Cliodita caduceus, Quoy and Gaimard, 1825. 

 113 specimens from thirty-five stations off South Georgia and the South Sandwich Islands. 



The specimens of this species, which was taken in comparatively small numbers, vary 

 in length from 0-75 mm. to 12 mm. : the Terra Nova specimens measured 2-5 to 16 mm. 

 The largest haul (twenty-five examples) occurred at night. Two specimens were taken in 

 hauls west of Cape Town, and two more occurred north-west of Tristan da Cunha. Two 

 larvae of 1-5 mm. occurred at St. 12. They have the white body covered, as is usual in 

 adults, with a dense speckling of black chromatophores. One had a sucker expanded 

 and the other had the lateral gills developed. An example of 2 mm. from St. 138 has 

 brown spots in zones. The larva of 0-75 mm. occurred with two older specimens at the 

 South Sandwich Islands, in December (SS 15). In an individual measuring 12 mm. 

 in length, taken oflF South Georgia (WS 37), the jaw and radula were of a bright 

 scarlet colour. The animal had been preserved in 5 per cent, formalin. I have never 

 previously seen any MoUuscan radula other than of an amber tint. The specimen has 

 been seen by Mme Pruvot-Fol, who also considers it to be very curious. In connection 

 with this it may be mentioned that the columellar margin of Limacina bidhnoides 

 (d'Orb.) is usually amber, but specimens in which it was bright red were observed by 

 Mile Bonnevie in North Atlantic collections. 



The genus Spougiobranchaeo is characterized by having two sucker-bearing arms ; a 

 posterior gill consisting of a simple band without rays ; a median tooth present in the 

 adult; shallow hook sacs and a median jaw with numerous spines. The present species 

 usually has about 7-10 suckers on each arm, of which those placed distally are much 

 larger than one or two next the mouth. Usually, but not always, the animal is densely 

 speckled with dark chromatophores. 



Distribution. Antarctic to about 50^ S in the Pacific and in the Atlantic to about 

 36° S (Meisenheimer, 1905). 



Spongiobranchaea intermedia, A. Pruvot-Fol, 1926 (PI. XXXIX, figs. 1-5; Fig. i). 



St. 71. Young-fish trawl, 2000 (-0) m. : i specimen. 



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



St. 239. 4-5 m. tow-net, 1050-1350 (-0) m. : i specimen. 



Two of the above specimens have the sucker-bearing arms beautifully extended and 

 measure 9-15 mm. in length. The other is 20 mm. long, but is a contracted specimen 

 and probably measured much more when alive. As the type was a contracted specimen 

 and possessed an incomplete median tooth, I sent these to Mme Pruvot-Fol who has 

 most kindly examined them for me and thinks that they may be S. intermedia or a variety 

 of the same. As she observes : " There are some important diflferences but the hook sacs 

 are identical and the radula is the same or nearly so. The median tooth shows a ' contre- 



