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 42, 

 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 SowB. Mai. and Conch. JNIag., p. 24, and 

 Conch. Illustr., figs. 16, 17. — Trochus e.rpa ?is«s Phil. Conchyl. Cab., 

 p. 254, t. 37, f 18. — T. (P/wtiuula) expansa E. A. Smith, Moll. 

 Kerguelen, Philos. Trans. 1877. — Watson Challenger Gasterop., p. 

 69. — Photina expansa A. Ad., P. Z. S. 1851, p. 191. — Tapparone 

 CANEFPvi, 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, £ 10.~2Iargarita (Photinula) expansa 

 VON Martens & G. Pfeffer, in Natur. hist. Mus. zu Hamburg, 

 Pagenstecher's Bericht fiir 1885, p. 100, t. 2, f. 10a, 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 Fxiego. 



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 Reeve, Conch. Icon., vol. xx, f. 5. — Tr. 

 violaceus Phil., Conchyl. Cab., p. 254, t. 37, f 19. — .? Margai-ita 

 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. au 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 



