, 42 DISCOVERY REPORTS 



Type locality. St. 159. South Georgia, 53 52' 30" S, 36° 08' 00" W, 160 m. 

 St. 157. Off South Georgia, 53 51' 00" S, 36 11' 15" W, 20 Jan. 1927, 970 m. 

 St. 158. Off South Georgia, 53° 48' 30" S, 35 57' 00" W, 21 Jan. 1927, 401-41 1 m. 



PChlanidota gaini (Lamy) 



Siphogaini Lamy, 19 106, p. 319. 



Sipho gaini Lamy, 1911a, p. 7, pi. 1, figs. 7, 8. 



Prosiphol gaini Thiele, 1912, p. 262. 



Type locality. Off King George I., South Shetlands, 420 m. 



This species, known to me only by Lamy's figure of the damaged holotype, seems to be a very 

 narrow, produced-spired Chlanidota. The thin shell, style of sculpture, and columellar twist recall 

 Chlanidota, also the large size (33 x 12 mm.) suggests this genus rather than Prosipho, the members of 

 which are quite small. Hedley (1916) suggested relationship between Siphogaini and his Pontiothauma 

 ergata, but that seems unlikely also. 



Genus Pfefferia Strebel, 1908 

 Type (here designated) : Pfefferia palliata Strebel 

 South Georgia, non Pfeifferia Gray, 1853 

 The genera Chlanidota and Pfefferia, as already explained, appear to be transitional between the 

 Cominellinae and the Buccinulinae. In Chlanidota the shell is very thin, the operculum dispropor- 

 tionately small for the size of the aperture, and the lateral teeth of the radula are tricuspid. In Pfefferia 

 the shell is much stouter, the operculum almost fills the aperture, is of peculiar form, with a heavy 

 ridged outer margin, and the lateral teeth of the radula are tricuspid also. In Cominella the operculum 

 is relatively large and ovate, with an apical nucleus, but no margining ridge and the lateral teeth of 

 the radula are bicuspid. 



The genus Pfefferia is known only from deep water off South Georgia. 



Pfefferia elata Strebel 



Pfefferia elata Strebel, 1908, p. 35, pi. 3, fig. 40. 

 Type locality. South Georgia, 54 17' S, 36 28' W, 75 m. 

 St. 30. West Cumberland Bay, South Georgia, 2-8 miles S 24 W of Jason Lt., 16 Mar. 1926, 251 m. 



Height 34-5 mm.; diameter 23-5 mm. (St. 30). 



Height 31-0 mm. ; diameter 21 -o mm. (St. 30). 



Dentition. Fig. L, 78, p. 194. The radula is abnormal in the only specimen, for there are two 

 additional incipient cusps and they are situated one on each side of the normal group of three cusps on 

 the central tooth. 



Operculum. Fig. N, 1 28, p. 196. Typical, horny, leaf-shaped, with apical nucleus and a very massive, 

 raised, striated border along the entire outer margin. Aperture of shell 1-3 times height of operculum. 



Range. South Georgia, 75-251 m. 



Pfefferia cingulata Strebel 



Pfefferia cingulata Strebel, 1908, pi. 3, figs, \za-c. 

 Type locality. Cumberland Bay, South Georgia, 252-310 m. 

 St. 146. Off South Georgia, 53° 48' 00" S, 35 37' 30" W, 8 Jan. 1927, 728 m. 

 St. 158. Off South Georgia, 53 48' 30" S, 35 57' 00" W, 21 Jan. 1927, 401-41 1 m. 

 Height 21-3 mm.; diameter 14mm. (St. 146, young example). 



