278 PHOTINULA. 



Genus PHOTINULA H. & A. Adams, 1854. 



Photinula H. & A. AD., Genera Rec. Moll., i, p. 427 ; and of 

 recent authors. Photina H. & A. AD., P. Z. S. 1851, p. 191 (not of 

 Burmeister). Margarita (in part) of authors (not of Leach). 



The genus Photinula was instituted for Margarita-like shells 

 with imperforate axis, confined to Antarctic America in distribution. 

 The species are few arid very variable. 



P. T^ENIATA Wood. PL 44, figs. 18, 19. PI. 64, fig. 37. 



Shell imperforate, depressed, conoid, thin, shining, white, unicolored 

 or with numerous spiral pink stripes and lines ; surface smooth ; 

 spire conical, apex acute, the first three w T horls encircled by three 

 coarse lirse ; whorls 6, the last rapidly increasing ; aperture oblique, 

 rounded-rhombic, w r ith a thin, finely folded, brilliantly iridescent 

 layer of nacre inside ; peristome simple, thin ; coliimella broad, 

 reflexed, appressed, arising from a small pad of callous on the base 

 of the shell. Alt. 21, diam. 26 mill. ; alt. 17, diam. 23 mill. 



Sts. of Magellan; Falkland Is. 



Trochus tceniatus WOOD, Index Test, suppl., t. 5, f. 12. PHILIPPI, 

 Conchyl. Cab., p. 251, t. 37, f. 12. FISCHER, Coq. Viv., p. 319, t. 

 100, f. 2. Margarita twniata Sows. Conch. 111., f. 2 ; in Reeve, 

 Conch. Icon., xx, f. 4. REEVE, Conch. Syst., t. 227, f. 2. T. bicolor 

 LESSON, Voy. de la Coquille, p. 345, t. 16, f. 3. Photinula tceniata 

 CHENU, Manuel, i, p. 361, f. 2681. Margarita ccerulescens KING, 

 Zool. Journ., v, p. 346, no. 54. SOWERBY in Reeve, Conch. Icon., 

 xx, f. 12. Trochus ccerulescens PHILIPPI, Conchyl. Cab., p. 250, t. 

 37, f. 11. WATSON, Rept. Challenger Gasterop., p. 68. Tr. lineatus 

 PHIL., Arch. f. Naturg. 1845, p. 56 (not of Da Costa). Margarita 

 maxima HOMBRON et JACQUINOT, Voy. au Pole Sud, p. 59, pi. 14, 

 f. 32, 33 (not T. maximus Koch). Photina coerulea A. Ad., P. Z. S. 

 1851, p. 191. Photinula ccerulescens ADS., Genera, i, p. 427. 

 T. hombroni FISCHER, Coq. Viv., p. 320, t. 100, f. 3. T.purpuratus 



FORBES, P. Z. S. 1850, p. 372, t. 11, f. 11. 







A large handsome species, easily recognized by its spiral red stripes 

 on a white ground. 



Var. CCERULESCENS King. PL 44, rigs. 18, 19. 



More depressed ; aperture more oblique ; color ashen or fleshy, 

 with spiral lines and bands of blackish-blue. 



