LYMNZIDZ OF NORTH AMERICA. ott 
Limnophysa wormskioldi Tryon, Amer. Journ. Conch., I, p. 254, 1865. 
Limnea vahlii, Jun., Morcu, Prod. Moll. Gron., No. 135. 
Limnea senegalensis Beck, Index, p. 111, 1838 (nude name); Morcu, 
Amer. Journ. Conch., IV, p. 35, 1868 (footnote). 
Limnea vahlii var. malleata M6ércu, Moll. Gron., p. 76, 1857—STEENSTRUP, 
Mal. Blatt. n. s., I, p. 17, 1879.—Morcu, Amer. Journ. Conch., 1V, p. 35, 1868. 
SHELL: Thin, sometimes translucent, ovate-oblong or elongated ; 
periostracum pale yellowish or greenish horn, sometimes reddish; sur- 
face shining, growth lines very fine, crossed by fine impressed-spiral 
lines giving the surface a delicately waved appearance; whorls 5% 
to 6, very convex, the body whorl very large and obese; sutures deeply 
impressed ; spire acutely pyramidal, generally a trifle longer than the 
aperture; aperture elongate-ovate or elliptical, sometimes a trifle ex- 
panded, outer lip thin, with a slight varical thickening in adult shells; 
inner lip rather wide, spreading over the parietal wall in a wide, more 
or less heavy white callus; axis slightly twisted with a weak, oblique 
plait; there is a small, narrow, umbilical chink. In some scalar speci- 
mens the umbilicus is rather widely open; the varical bands on the 
shell number two or three. 
Length. Width. Aperture length. Width. 
22.00 9.00 11.00 .... mill. (Morch, typical). 
18.50 9.00 9.00 AS Om a St. Michaels. 
15.50 7.50 7.00 350 ~ Alaska. 
16.00 7.50 9.00 450 ~ 2 
14.50 7.00 7.00 AACNO) 9 2 
16.00 6.50 6.00 sy (Scalariform). 
18.25 9.00 9.10 A975 Yukony Rent: 
19.10 9.50 10.00 ZA a $ 
11.00 5.50 5.50 2.75 “  Grodnlandica ex Morch. 
15.00 7.00 AE .... “  Wormskioldi ex Morch. 
18.00 9.00 Sains .... “  Malleata ex Morch. 
15.00 7.00 ae tae .Solidalavexsiorch 
Types: The types of vahlii and its varieties are believed to be 
in the University Museum of Copenhagen. 
Type Locauiry: Vahlii, Amaraglik; mdlleri, Tunnundliarbik; 
wormskioldi, Wormskiold; solidula and malleata, exact locality not 
stated. 
AnIMAL: “Animal grayish-green with minute yellow white dots” 
(Moller, teste Morch). 
Jaw, Rapura and GeniraALiA: Not examined. 
RANGE: (Figure 39) Greenland west to Alaska, south to Great 
Slave Lake and Ungava. 
Vahlit is a Boreal species of wide distribution, extending north- 
ward from about the 58th degree of north latitude. It will probably 
MEASUREMENTS of Two SCEcimENs «w THE ECELD MUSEUM » 
FROM: SoutTa STRom FIORD, GREENLAND | ‘G20 4. 
15a xX WS ns 2x 7.1 San 
\A.% x [o.3 wm. jot x 6.3. 
