HELIX flEMITROCHUS. 27 



more depressed, and very slightly descending anteriorly, much less 

 so than in H. varians. The peristome is slightly thickened within, 

 sub-obtuse, not expanded except in the immediate vicinity of the 

 umbilicus, where it is reflexed and adnate over the umbilicus. The 

 columella is shaped as in H. varians, but is shorter, and although 

 sometimes subdentate, is less calloused within. It is pink or white. 

 Parietal wall generally pink. 



Alt. 12-13, diam. 14-16 mill. 



Crooked Id., Bahamas. 



H. caribcea WEINL., Malalc. Blatt. 1862, p. 196. PFR., Mono- 

 grapliia v, p. 238. 



This form differs from H. gallopavoris in being heavier in texture, 

 and in lacking the expansion of the basal and outer lips so charac- 

 teristic of really adult specimens of that species. It is most nearly 

 allied to H. varians, but differs as already indicated. Being unfig- 

 ured, the species has been frequently wrongly identified, at least in 

 American collections. Numerous specimens, including one from 

 Dr. WEINLAND are before me. 



H. GALLOPAVONIS Valenciennes. PI. 31, figs. 17, 18. 



This species is similar to H. varians in general form but usually 

 the body-whorl is more depressed, the aperture more oblique, and 

 the texture lighter, and thinner. The umbilicus is a narrow chink 

 as in H. variaus. The surface is more roughened by growth-lines 

 than in H. varians, and the ground-color not so pure white, but 

 generally slightly suffused with the color of the bands; apex dark, 

 rosy or white; bands generally of a rich chestnut color, sometimes 

 replaced by longitudinal streaks ; rarely the shell is white. Aper- 

 ture transversely oval-lunar, generally wider than in H. varians, 

 (and usually wider than the figures show ) ; bands showing within 

 the aperture, but not so much upon the peristome as in H. varians. 

 The outer and basal margins of the peristome are more expanded 

 than in H. varians, in adult individuals. 



Alt. 11, diam. 14 mill ; Alt. 13 diam. 14 mill. 



Turk's Id. (and St. Croixf). 



H. gallopavonis VAL., PFR, Symb. ii, p. 28 ; Monographia i, p. 239 ; 

 Conchijl. Cab. p. 223, t. 109, f. 12-13. REEVE, Conch. Icon. f. 1207. 



H. gallopavoris has much the same color-mutations as H. 

 varians. 



