210 RIEBECKIA. 



gyro, (Opeas?} hirsutus G.-A., t. c., p. 811, pi. 69, f. 6, 6a. 

 S. (Balfouria] kirsuta G.-A., CROSSE, Journ. de Conchyl. 

 1884, p. 356. 



Mr. Smith writes of this species as follows: "After care- 

 fully examining the types of S. Jessica and S. hirsutus, and 

 the series of specimens obtained by Dr. Forbes and Mr. 

 Grant, I feel convinced that only one species is represented. 

 The types of S. Jessica are worn bleached shells which have 

 lost the 'hairs' retained by S. hirsutus, the unique type of 

 which is merely a very young shell, but in fresh condition. 

 This was commented upon by Martens when describing his 

 8. arguta. Specimens vary somewhat in form, some being 

 longer and more slender than others. The specimen examined 

 is 23 mm. long and 6 broad. A shorter example is 17 in 

 length and 5y 2 in diameter. One of the specimens from 

 Homhil is in perfect condition, being clothed with a beau- 

 tiful hairy periostracum, the 'hairs' being arranged in rows 

 upon the lines of growth, and longer than in the type." 



The original descriptions of S. Jessica and 8. hirsutus 

 follow : 



S. Jessica (pi. 55, fig. 93). "Shell elongately turreted, 

 dextral, decollate in the three specimens obtained, scarcely 

 rimate ; sculpture very fine longitudinal ribbing ; color white ; 

 spire long, with sides flatly convex; suture very shallow; 

 whorls 8-\- ; sides very flat ; aperture oval, oblique, angulate 

 above; peristome thin; columellar margin weak and but 

 slightly reflected. Length 19.2, diam. 5.3, alt. of aperture 

 5 mm." (G.-A.) 



Not very common, on the limestone-ridge S. W. of Gollonsir, 

 at high altitudes; at 1000 ft. on south side of the island. 

 (Balfour.) 



S. hirsutus (pi. 55, figs. 91, 92). "Shell dextral, elongately 

 turreted, scarcely rimate, covered with a thick epidermis; 

 sculpture a rough surface with regularly disposed longitu- 

 dinal lines of fine hairs (fig. 92); color dull ochre; spire 

 elongate, sides flat, apex blunt, suture well impressed ; whorls 

 11, sides slightly convex; aperture oval, oblique; peristome 

 thin; columellar margin thin, slightly reflected. Length 11, 

 diam. 3, alt. of aperture 2 mm." (G. A.). 



