428 HELICID^. 



distinct ; foot but two thirds length of shell, whitish ; the body, 

 disk, and mantle are marked with white dots, the edge of the man- 

 tle is of the same color as the head and eye-pedun- 

 '^^^' cles. The disk is rounded posteriorly, and broad 



and truncated anteriorly, the lateral borders are 

 deeply crenulated. Tlic head is separate from the 

 disk as in the Pupince, bearing two minutely crenu- 

 Animui of H. ? harpa. latcd lappcts, wliicli liaug dowu on either side of the 

 mouth like a visor, reminding one of the oblique 

 folds on the head of Glamlina tnmcata, which we believe to be ho- 

 mologous to them. A longitudinal furrow extends from the mouth 

 downward. The body is so translucent that when extended the 

 ganglionic centres can be plainly seen. In motion they are exceed- 

 ingly graceful, at times poising their beautiful shell high above their 

 body, and twirling it around not unlike the PJiysa, again hugging 

 their pretty harp close to their body, the shell when in this last 

 position continually oscillates as if the animal could not balance 

 it ; it rarely ever moves in a straight line, but is always turning 

 and whisking about, and this is done at times very quickly and 

 abruptly, (ilforse.) 



Helix pulchella. 



Fig. 102. 



Shell minute, white, depressed; Avhorls four, suture deep; aperture circular, lip 

 reflexed, thickened; umbilicus large. 



Helix pulchella, Muller, Verm. 30. — Pfeiffer, Mon. Hcl. Viv. i. 365. — Binney, 



Bost. Journ. Nat. Hist. iii. 375, pi. 9, fig. 2 (1840) ; Terr. Moll. ii. 175, pi. 17, fig. 1. 



— Leidv, Terr. Moll. U. S. i. 256, pi. 9, figs. 7-9 (1851) anat. — Gould, Inv. 17G, 



fig. 102 (1841). — Ai).vM.s, Vermont Moll. 159 (1842). 

 Helix viinuta, Say, Journ. Acad. i. 123 (1817) ; Nich. Encyc. 3d cd. (1819); Binney's 



cd. 3.— De Kay, N. Y. Moll, 40, pi. 3, fig. 33 (1843). 

 Helix costata, Mijller, vick Pfeiffer, Mon. Hel. Viv. i. 366. 

 Vallonin minnta, Morse, Journ. Portl. Soc. i. 21, figs. 54, 56; pi. 8, fig. 57 (1864). — 



Tryon, Am. Journ. Conch, iii. 36, pi. 7, fig. 26 (1867). 



Shell minute, semi-transparent, white, or very light horn color, 

 thin, depressed ; whorls four, very minutely marked with lines of 

 growth, the last spreading at the mouth like a trumpet; suture 

 deeply impressed ; aperture circular, the lip very nearly surround- 

 ing it, much thickened, white, and reflected ; umbilicus large, ex- 

 hibiting all the volutions within. Diameter one tenth of an inch. 



Animal pale, semi-transparent. 



