192 HELIX. 



pinkish-l>ro\vn and yellowish-white into a dusty yellowish-gray ; and 

 there is generally (though by no means always) a rosy tinge about 

 the peristome." (Wollaston.') The St. Miguel specimens were 

 probably introduced. 



Yar. HYJKNA Lowe. 



Large, coarsely sculptured, pale yellowish brown, the bands much 

 broken. Diam. 20 mill. 



Southern Deserta, Madeira Is. 



The other varieties recognized by Wollaston, fwrto-sancti and 

 advenoides are scarcely distinct enough for names. The former may 

 be the same as H. siuiia Fer. 



H. FURVA Lowe, 1831. PI. 51, figs. 15-17. 



Imperforate, depressed globose, thin, yellowish, with a peripheral 

 interrupted dark brown band, roughened by incremental stria? and 

 irregular reticulations or malleations, whorls 5, but slightly convex, 

 separated by scarcely indenting sutures, gradually increasing, the 

 body-whorl angular at its origin, becoming rounded, with tumid 

 buse, and descending anteriorly; aperture round-lunar, oblique; 

 peristome simple ; columella entering .deeply and nearly directly. 



Diam. 17-22, alt. 12 J mill. Madeira. 



Aperture less oblique and less deflected above than in H. erubes- 

 cens, body-whorl angular at its origin, and coloration different. 



(Species of the Cape Verde Islands.) 



H. ADVENA Webb et Berthelot, 1833. PI. 50, figs. 92, 93; pi. 52, 



figs. 84, 85. 



Imperforate, globose-depressed, rather thin, shining corneous with 

 (about) five dark brown bands the upper ones wider, frequently 

 eoalescent, and interrupted by oblique light streaks densely irregu- 

 larly sculptured with oblique stria?, and with almost obsolete spiral 

 impressed lines; whorls 4, slightly convex, rapidly increasing the 

 apex obtuse, dark, smooth; body-whorl gently and slightly descend- 

 ing anteriorly; aperture rounded lunar, oblique; peristome slightly 

 expanded, its ends converging, the columella arched, and dilated 

 and appressed over the umbilicus. Diam. 16, alt. 11 mill. 



SI. Antno ' in d St. Vincente, Cape Verde Is. 



This species has been confounded by some authors with H. embes- 

 cens, but is most readily separated by attention to the sculpture and 

 the character of the columella, which has a wholly different in- 

 sertion from that species. The spiral sculpture, is shared with the 

 following species; but in advena is so obscure as to be easily over- 

 looked. The species never has so warm a color as H. erubescens. 



