196 



PROTOCONCHS AND OPERCULA 



Fig. N. Protoconchs (all to uniform scale). (102) Ataxocerithium pullum (Philippi), Falkland Is., St. WS 225. (103) Tromina 

 tricarinata n.sp., Clarence I., St. 170. (104) Tromina bella n.sp., Falkland Is., St. WS 817. (105) Cavineptunea monstrosa 

 n.g. and n.sp., South Georgia, St. 159. (106) Proneptunea fenestrata n.sp., South Georgia, St. 140. (107) Trophon gever- 

 sianus (Pallas), Falkland Is. (108) Zeatrophon ambiguus (Philippi), New Zealand. (109) Xymene plebejus (Hutton), New 

 Zealand, (no) Xymenopsis liratus (Gould), Falkland Is., St. 52. (in) Trophon (Fuegotrophon) pallidus (Broderip), 

 Staten I., St. WS 88. (112) Leucosyrinx falklandica n.sp., Falkland Is., St. WS 781. (113) Leucosyrinx paragenota n.sp., 

 Burdwood Bank, St. 652. (114) Lorabela n.g. notophila (Strebel), South Georgia, St. WS 27. (115) Belalora thielei n.g. and 

 n.sp., Falkland Is., St. WS801. (116) Pleurotomella? ohlini (Strebel), Falkland Is. (117) Plenrotomella simillima (Thiele), Ross 

 Sea, St. 1660. (118) Eumetadrillia fuegiensis (Smith), off Patagonia, St. WS 787. (119) Typhlodaphne n.g. purissima (Strebel) 

 South Georgia, St. 159. Opercula (Figs. 120, 121, 123-126, 130 all to uniform scale. Fig. 122 = §, and Fig. 127= x 2) 

 (120) Perissodonta georgiana Strebel, South Georgia, St. WS 62. (121) Pelicaria vermis (Martyn), New Zealand 

 (122) Struthiolaria papulosa (Martyn), New Zealand. (123) Probuccinum delicatulum n.sp., South Georgia, St. 159 

 (124) Proneptunea fenestrata n.sp., South Georgia, St. 140. (125) Notoficula problematica n.sp., Falkland Is., St. WS 766 

 (126) Tromina tricarinata n.sp., Clarence I., St. 170. (127) Falsimohnia albozonata (Watson), South Georgia, St. 149 

 (128) Pfefferia elata Strebel, South Georgia. (129) Chlanidota signeyana n.sp., South Orkney Is. (size relationship between 

 operculum and aperture represented by crossed lines). (130) Typhlodaphne n.g. purissima (Strebel), South Georgia, St. 159. 



