LYMNZIDE OF NORTH AMERICA. 383 
leated ; nuclear whorls 1%, small, well rounded, white or wine colored 
(pl. XLIX, fig. J) ; whorls 5 to 6, well rounded, the body whorl typical- 
ly very large and moderately convex; spire varying from short, de- 
pressed, dome-shaped to turreted, acutely conical or pyramidal; sutures 
impressed, in some specimens almost channeled; aperture ovate or 
long ovate, somewhat produced and effuse anteriorly, as long as, or 
longer than, the spire; peristome thickened within by a longitudinal 
varix edged with chestnut; inner lip narrow, reflected and appressed 
tightly to the columellar region, either completely closing the umbilicus 
or leaving a very small, narrow chink; columella with a heavy oblique 
plait causing the axis to be twisted; in specimens from some locali- 
ties the shell is very solid and the inner lip and axis is covered by a 
heavy coating of white, shelly material. The parietal wall is covered 
by a more or less thickened callus. 
Length. Width. Aperture length. Width. 
20.10 11.00 12.00 6.00 mill. Say’s type. 
17.50 9.75 10.00 5.00 “ 4 x 
14.50 10.00 10.00 5.00 “ Type pinguis. 
14.00 8.50 9.00 OO N a x = 
9.10 5.50 6.00 2.80 “ Type brownti. 
22.50 11.00 12.00 6.50 “ Delaware River. 
15.00 9.00 9.00 BOD ae : oe 
14.50 8.10 9.00 4.30 “ Genesee River. 
18.00 8.10 9.10 Abe a ey i 
11.80 6.80 8.10 35 0b ee cS s 
16.10 8.50 9.00 4.60 “ Pine Lake, Mich. 
15.50 8.25 9.00 ATG Os o HY 
11.50 8.00 8.50 FOO oa Ey nf 
15.10 8.10 7.50 ZN ONS = 7% fe 
14.50 8.50 8.50 4.80 “ Ohio. 
15.00 9.00 8.75 5008 was Mohawk River. 
f3cio 8.50 8.00 AL90. - 
13.00 6.00 6.50 S000 ees Cotype intertexta. 
20.00 11.00 12.00 Fa OP ue Black Lake. 
19.50 11.50 12.60 6:00) eae ih E 
eT 9.00 9.80 4.80 “ Seneca Lake. 
(13.10 8.00 8.50 Bo a e 
Types: Catascopium, two specimens, Academy of Natural Sci- 
ences, Philadelphia, No. 58486; pinguis, two specimens, Phil. Acad., 
No. 58571; brown Tryon, one specimen, Phil. Acad., No. 58516; 
linsleyi DeKay, N. Y. State Museum, Albany; intertexta, Kent Sci- 
entific Museum, Grand Rapids, Mich.; cotypes, coll. Bryant Walker, 
No. 17358; cornea Val., location not ascertained. 
Type Locatity: Catascopium and pinguis, Delaware River, Phil- 
adelphia, Pa.; brownti, Elyria, Ohio; linsleyi, Stratford, Conn. ; cornea, 
