THE NAUTILUS. VE 
basal and outer walls of the body whorl. In this they are compara- 
ble to the Clausilias, Endodontas, ete. 
The species may be tabulated thus: 
a. Internal lamellz on floor of body whorl 2 or 3, short; color dark 
brown ; one parietal fold conspicuously emerging from aperture. 
b. Form elevated conoidal . . . S. dabyrinthica Say. 
bb. Form much depressed . . S. labyrinthica strebeli Pfr. 
aa. Internal lamelle on floor and adjacent side wall of body whorl 
6 or more. : 
b. 6 long lamelle ; 2 parietal foldsemerging; color white or 
pale brownish ; form elevated, . . S. virgo Pils. 
bb. About 8 short lamellz arranged in a curved radial series; 
color dark brown; form elevated ... . S. affinis Pils. 
The figures of Morse and Binney represent S. labyrinthica Say. 
The S. labyrinthica strebeli Pfr. was described from Mirador, 
Mexico, the specimens before me being from that locality. It was 
well figured by Pfeiffer in the Malakozoologischer Blitter viii, pl. 1, 
figs. 5-8; but Crosse and Fischer’s figures (Moll. Mex.) do not 
represent it. They were probably drawn froma specimen of S. 
virgo, but certainly not from strebeli. Mr. Sargent has found a 
form closely resembling the Mexican strebeli, at Woodville, Ala. 
The original examples of S. virgo are greenish-white in color. 
They were collected by Rev. H. W. Winkley near Sebec Lake, 
Piscataquis Co., Maine. Mr. Sargent has found a form of the same 
species at Woodville, Ala., where they are of a light brownish 
tint. 
S. affinis isa large form, very abundant at many localities in 
New York, Ohio, etc. Its prominent feature is the armature of 
numerous short lamella, extending in a forwardly curved series from 
the axis across the base and up the side wall. 
The writer wishes to prepare an illustrated paper upon these 
forms, and will be glad to receive specimens from as many localities 
as possible, and especially western and southern localities. Anyone 
sending specimens will receive in return (if they wish it) a copy of 
the pamphlet “Preliminary Classification of the Helices,” and, 
when it is issued, a copy of the projected paper on Strobilops. 
