DENTITION 



189 



Fig. G. Dentition of Fissurellidae, Trochidae and Turbinidae. (1) Puncture/la noachina Linn., Greenland (Troschel & Thiele, 

 1891, pi. 27, fig. 2). (2) Puncturella conica (d'Orbigny), South Georgia, St. 27. (3) Parmaphorella melvilli (Thiele), Falkland 

 Is., St WS 825. (4) Margarella (Promargarita) tropidophoroides (Strebel), South Georgia (Thiele, 1912, pi. 15, fig. 17). 

 (5) Antimargarita dulcis (Smith), McMurdo Sound (Eales, 1923, fig. 4). (6) Tropidomarga biangulata n.g. and n.sp., South 

 Georgia, St. 159. (7) "Margarita striata' =Pupillaria cinerea Couthouy, Greenland (Troschel & Thiele, 1891, pi. 25, fig. 9). 

 (8) Margarella bouvetia n.sp., Bouvet I. (9) Margarella antarctica (Lamy), South Orkneys, St. 164. (10) Submargarita 

 impervia Strebel, South Georgia (Thiele, 1912, pi. 15, fig. 18). (11) Solariella kempi n.sp., Falkland Is., St. WS 766. 

 (12) Solariella biradiatula Martens, Dar-es-Salam (Martens & Thiele, 1903, pi. 8, fig. 37). (13) Leptocollonia thielei n.g. 

 and n.sp., South Georgia, St. 156. (14) Homalopoma carpenteri Pilsbry, California (Pilsbry, 1888, pi. 60, fig. 73). 



