152 



FISSURELLA. 



F. GRISEA Reeve. PL 39, fig. 9. 



Shell ovate, rather depressed, smooth, concentric lines of growth 

 somewhat irregular. Orifice rather small, oblong. Ash-gray, violet 

 toward the base, obscurely rayed. This species has no sculpture 

 to characterize it, but the coloring is peculiar. (Rve.) 



Habitat unknown. 



F. grisea RVE, Conch. Icon., f. 38, 1849. SB Y. Thes. Conch, iii, 

 p. 184, f. 85. 



Evidently closely allied to F. bridgesii, but more oval and 

 elevated, the foramen more central. 



F. FULVESCENS Sowerby. PL 33, fig. 49. 



Shell oblong, depressed, fulvescent, narrower in front ; milk-white 

 inside, the margin subthickened, subreflexed ; outside smooth, 

 radiately substriate and painted with rufous ; aperture oblong, its 

 sides obsoletely bidentate. (Sowb.) 



Length 1-6, breadth O9 inch. 



Valparaiso, Chili. 



F.fulvescem Sow. P. Z. S. 1834, p. 127 ; Conchol. Illust., f. 49. 

 REEVE Conch. Icon., f. 42. SOWB. Thes. Conch., p. 184, f. 36. 



Reeve says : From the bright yellow coloring of this shell, the 

 rays have very much the appearance of sunbeams. 



F. ORIENS Sowerby. PL 46, figs. 18, 19 ; pi. 34, fig. 58. 



Shell oblong, conical, summit about central; sculptured with 

 close fine distinct radiating striae. Perforation about one-ninth the 

 length of the shell. 



The outline is elongated-elliptical, more lengthened than a 

 specimen of F. maxima or F. darwinii of equal size, and the radiat- 

 ing striation is much finer, more even, than in these two species and 

 their allies. The color-pattern in typical examples, consists of con- 

 centric zones alternately light grayish and darker purplish ; over 

 the whole are reddish rays (to the number of 13-15), each one split 

 more or less obviously into two. The tract immediately adjacent 

 to the perforation is speckled. Inside white, the marginal border 

 grayish, rather narrow. Length 46, breadth 27, alt. 11 mill. 



Coast of Chili and Is. of Chiloe. 



F. oriens SOWB. P. Z. S. 1834, p. 124; Conchol. Illust. f. 25. 

 REEVE, Conch. Icon. f. 13. SOWB. Thes. Conch, iii, p. 186, f. 19, 20. 



It is like latemarginata in the fine even striation, but is a narrower, 

 higher shell, with pale narrow internal border. 



