i go 



DENTITION 



Fig. H. Dentition of Trochidae (Calliostomatinae). (15) Calliostoma modestulum Strebel, Falkland Is., St. WS 80. (16) Vennsta- 

 trochus georgianus n.g. and n.sp., South Georgia, St. 42. (17) Livonia pica Linn., West Indies (Thiele, 1924, fig. n). 

 (18) Calliostoma coppingeri (Smith), Falkland Is., StWS. 852. (19) Calliostoma granulans Born., Mediterranean (Troschel 

 & Thiele, 1879, pi. 24, fig. 18). (20) Calliostoma sublaevis chuni Martens, off Somaliland (Martens & Thiele, 1903, pi. 8, 

 fig. 42). (21) Calliostoma conulus Linn., Messina (Troschel & Thiele, 1879, pi. 24, fig. 16). (22) Calliostoma nordenskjoldi 

 Strebel, Patagonia, St. WS. 776. (23) Falsimargarita gemma (Smith), off Oates Land (Eales, 1923, fig. 6). (24) Photinula 

 coerulescens (King & Broderip), Falkland Is., St. WS 869. (25) Photinastoma taeniata (Wood), Falkland Is., St. 56. 



