PHOTINULA. 279 



P. EXPANSA Sowerby. PI. 39, figs. 51, 52. 



Shell imperforate, depressed-conoidal, thin, shining, of a light 

 olivaceous tint or somewhat tinged with pink ; surface smooth ; 

 spire conoidal, acute; sutures slightly impressed; whorls about 4, 

 rapidly widening, the last large, rounded at periphery, a little im- 

 pressed or margined below the suture; aperture large, rounded, 

 angular above, green and iridescent inside ; columellar margin a little 

 straightened ; umbilico-columellar tract slightly excavated. 



Alt. 9, diam. 12 mill. 



Falkland Is., Kerguelen Id. ; Sts. of Magellen ; South Georgia. 



Margarita expansa Sows. Mai. and Conch. Mag., p. 24, and 

 Conch. Illustr., figs. 16, 17. Trochns expansus PHIL. Conchy!. Cab., 

 p. 254, t. 37, f. 18. T. (Photinula) expansa E. A. SMITH, Moll. 

 Kerguelen, Philos. Trans. 1877. WATSON Challenger Gasterop., p. 

 Q9.Photina expansa A. AD., P. Z. S. 1851, p. 191. TAPPARONE 

 CANEFRI, Zool. Viaggio ' Magenta,' p. 67. Photinula expansa 

 H. & A. AD., Genera, i, p. 428. T. (Margarita) hillii FORBES, 

 P. Z. S. 1850, p. 272, t. 11, f. 10. Margarita (Photinula) expansa 

 vox MARTENS & G. PFEFFER, in Natur. hist. Mus. zu Hamburg, 

 Pagenstecher's Bericht fur 1885, p. 100, t. 2, f. lOa, b, c, d. (1886.) 



P. VIOLACEA King. PI. 39, figs. 42, 43. 



Shell imperforate, orbicular-conic, thin, smooth, purplish-pink ; 

 whorls 4, tumid ; suture scarcely impressed ; aperture rounded-quad- 

 rangular, angular above, subangular at base of columella ; columella 

 subthickened, subarcuate ; umbilico-columellar tract excavated. 



Alt. 10, diam. 10 mill. 



Straits of Magellen ; Orange Harbor, Tierra del Fuego. 



Margarita violacea KING, in Zool. Journ., v, p. 346 (1832-34). 

 SOWERBY, Mai. and Conch. Mag., i, p. 24 (1838) ; and Conch. 111., 

 figs. 11, 12. SOWB. in Keeve, Conch. Icon., vol. xx, f. 5. Tr. 

 violaeeus PHIL., Conchyl. Cab., p. 254, t. 37, f. 19. f Margarita 

 magellanica GOULD, U. S. Expl. Exped. Moll., p. 192, atlas, f. 228. 

 Margarita persica GOULD, I. c. p. 193, atlas, figs. 230. Margarita 

 magellanica (de novo) HOMBRON et JACQUINOT, Voy. an Pole Sud, 

 Zoologie, vol. v, p. 59, atlas t. 14, f. 29-31 (1854). 



This form seems to be of a deeper pink shade than P. expansa. 

 It is somewhat more conical, with smaller aperture. I am not 

 certain of the identity of M. magellanica Gld. The original figures 



