128 THE CHICAGO ACADEMY OF SCIENCES. 
“Shell ventricose, with a short acute spire and few rounded whorls, 
rugose, umbilicate, the last whorl ample, with a rotund transverse 
aperture, and continuous peristome appressed on the columellar mar- 
gin; the outer lip simple” (Dall). 
The type is Zagrabica naticoides BRuSINA, a Pleistocene fossil. Ac- 
cording to Dr. Dall, Dybowski has referred to this group a recent 
species from the Caspian Sea under the name of Z. brusiniana. As 
remarked by Dall, this group appears from the description to be 
related to Radix. 
Velutinopsis SANDBERGER, Land und stissev. Conch. d. Vorwelt, p. 700, 1875. 
—Tryon, S. & S. Conch., III, p. 101, 1884—Datt, Alaska Moll., p. 63, 1905. 
“Shell almost planorboid, with but few, rounded, rapidly increasing 
whorls; the aperture simple, suborbicular, the peristome sharp, simple, 
not reflected; the pillar lip broad, not appressed; the axis umbilicate” 
(Dall). Type, Lymne@a velutina DEsHAYEs, from the Pliocene of the 
Crimea. 
As remarked by Dr. Dall, this fossil genus looks like Choanom- 
phalus, and it probably belongs with Pompholyx and Carinifex, and 
not to the Lymnezide. 
Erinna H. and H. ApAms, Gen. Rec. Moll., II, p. 644, 1858—Da.i, Ann. 
Lyc. N. H., IX, p. 350, 1870.—Trvon, S. & S. Conch., III, p. 102, 1884—Da t, 
Alaska Moll., p. 63, 1905. 
“Shell small, with a short spire, a large final whorl; the aperture 
with a continuous peristome which passes behind a broad, somewhat 
excavated pillar; axis imperforate and the pillar plicate’”’ (Dall). Type, 
Erinna newcombi ApAMs, from the Hawaiian Islands. 
This group has been modified, as stated by Dr. Dall, by its habit 
of living on rocks in swiftly running water or in waterfalls; this modi- 
fication causing the spire to shorten up, the aperture to become ex- 
panded and the inner lip to be continued over the body whorl, providing 
a flat basal surface enabling the animal to cling tightly to its rocky 
support. 
Physastra TAPPARONE-CANEFRI, Ann. Mus. Genov., XIX, p. 245, 1883.— 
Dati, Alaska Moll., p. 64, 1905. 
“Shell like Stagnicola, but with a coarse dehiscent periostracum, 
and coiled sinistrally” (Dall). Type, Physastra vestita TAPPARONE- 
CANEFRI, from New Guinea. 
The reversed Lymnezids from Polynesia will probably fall into this 
genus, which will doubtless be found to possess distinctive characters. 
in the genitalia and radula. 
