THE NATURAL HISTORY SURVEY. 265 
expanded, the columella callus making a ridge which is re- 
flected over the umbilical region; umbilicus open, deep. 
Length, 12.50; width, 8.00; aperture length, 8.50; width, 5.50 mill. 
6 1,005. s-* "8.00: “i ng SOO ts 00S 
“ LES hata S:00- ue as PAU UE oe garreme: BY 155 LG 
Animal, jaw, radula and genitalia not examined. 
Distribution: Southern part of Lake Michigan. 
Geological distribution: Pleistocene. 
Hatitat: Probably similar to catascopium and emarginata, 
but inhabiting rather deep water. 
Remarks: This species has been a puzzle for several years 
and has been referred to both decollata and catascopium.* It 
certainly is not any form of catascopium, and judging by the 
figures in Binney, Haldeman and Tryon it is not decollaia. 
Specimens of the latter received from the Philadelphia Acad- 
emy of Sciences are decidedly different, the spire being longer, 
the number of whorls less and the shape of the aperture dif- 
ferent. The principal characteristics ot woodruffi are its very 
short spire, rapidly increasing and swollen whorls, and its 
roundly oval aperture with its broad shoulder at the upper part. 
It looks not unlike a miniature Lizun@a emarginata var. mighelst. 
Specimens sent to Mr. Bryant Walker were declared by him to 
be distinct from anything he had seen. The present species 
has been described as new, for the reason that in a lot of some 
two hundred specimens no individuals have been found con- 
necting it with any known form. It has been found at Miller’s, 
Ind., and along the lake shore, in Chicago, by Mr. F. M. Wood- 
ruff, to whom the species is dedicated. 
107. Limnza desidiosa Say, pl. xxx, fig. 20; pl. xxxi, fig. 7. 
Limnea desidiosa SAY, Journ. Phil. Acad., Vol. II, p. 169, 1821. 
Limnea modicella Sav, Journ. Phil. Acad., Vol. V, p. 122, 1825. 
Limnaa acuta LEA, Trans. Amer. Phil. Soc., Vol. V, p. 114, pl. xix, fig. 
81, 1837. 
Limnaa philadelphica LEA, Proc. Amer. Phil. Soc., Vol. II, p. 82, 1841. 
Limnea plica LEA, Proc. Amer. Phil. Soc., Vol. II, p. 38, 1841. 
Limnea rustica LEA, |. c., p. 38, 1841, 
Limnea planulata LEA, |. c., p. 38, 1841. 
Limnea jamesit LEA, Proc. Phil. Acad., p. 118, 1864. 
Limne@a desidiosa var. decampi, L. H. STRENG, The Nautilus, Vol. IX, 
p. 123, 1896. (Variety.) 
Shell; Subconic, pointed, oblong, rather thin, sometimes 
*In the writer’s paper on Limnza before mentioned, pl. i, fig. 12, this form was referred 
to variety Jimguis Say. The receipt of a large number of specimens has demonstrated that 
it is not that form. 
Sie 4 - 
OS a a eee = 
