LYMNZIDZ OF NORTH AMERICA. 235 
Lymnea holbollii Mower, Ind. Moll. Groen., p. 5, 1842.—ReEEvE, Voy. As- 
sistance, p. 392, 1855.—Dat1, Moll. Alaska, p. 74, fig. 53, 1905. 
Limneus holbollii Ktster, Conch. Cab., p. 28, taf. 5, figs. 13, 14, 15, 1862. 
Limnophysa holbollii b. minor, BEcK., p. 111, 1838. 
Limnophysa holbollii, a major, Brcx., p. 111, 1838. 
Limnophysa holbollii Tryon, Amer. Journ. Conch., I, p. 254, 1865. 
SHELL: Small, elongate-ovate, conic, thin, more or less scalar ; 
color greenish horn; surface dull to shining, lines of growth very fine, 
crossed by microscopic impressed spiral lines ; whorls 5, well rounded, 
not rapidly increasing in diameter; spire acutely conical, much longer 
than the aperture; sutures well impressed ; aperture roundly-ovate, in 
some specimens almost continuous ; outer lip thin, no varical thickening 
observed in the specimens examined; inner lip rather wide, triangular, 
reflected over but not covering the umbilicus, which is rather widely 
open; parietal callus thin; axis slightly twisted; varical bands on the 
shell four or five in number. 
Length. Width. Aperture length. Width. 
14.00 smiae 7.00 . mill. Vide Morch 
12.00 6.50 55 Sl. Greenland 
11.50 6.00 Dato SP i a 4 
11.00 6.00 5.00 Dini ‘ 
Types: Museum of University of Copenhagen, Denmark. 
Type Locatity: Godthaab, Greenland. 
Anima: “Dark yellowish-gray; tentacula narrower and more 
pointed than L. vahlii.’ (Moller.) 
Jaw, Rapura and Genitaria: Unknown. 
Rance: Greenlandian region. A typical boreal species, not known 
to live outside of Greenland. 
RECORDS. 
GREENLAND: Greenland (Walker) ; Godthaab (Moller). 
GroLocicAL RANGE: Unknown. 
Ecotocy: Found in a little tank in the mountains of Godthaab 
( Moller). 
Remarks: Holbollii may be known by its small size, long, acute 
spire, short, roundly-ovate aperture and large umbilical chink. The 
whorls are evenly rounded and the inner lip is quite expanded. It 
differs from truncatula in its more regularly acutely-conic spire and 
less compressed and more triangular inner lip. It greatly resembles 
some specimens of caperata, but lacks the decided sculpture of that 
species, besides having less rotund whorls and a differently shaped 
inner lip. By most conchologists, holbollii has been ranged with vailit 
under Stagnicola, but its affinities seem rather to be with truncatula 
under Galba. 
