THE NAUTILUS. 57 



basal and outer walls of the body whorl. In this they are compara- 

 ble to theClausilias, Endodontas, etc. 

 The species may be tabulated thus : 

 a. Internal lamellae on floor of body whorl 2 or 3, short ; color dark 

 brown ; one parietal fold conspicuously emerging from aperture. 

 h. Form elevated conoidal . . . S. labyrinthica Say. 

 bb. Form much depressed . . S. labyrinthica strebeli Pfr. 

 aa. Internal lamellfe on floor and adjacent side wall of body whorl 

 6 or more. 



b. 6 long lamellse ; 2 parietal folds emerging; color white or 

 pale brownish ; form elevated, . . S. virgo Pils. 

 bb. About 8 short lamellae arranged in a curved radial series; 

 color dark brown ; form elevated . . . . S. affinis Pils. 

 The figures of Morse and Binney represent S. labyriyithica ^ay. 

 The S. labyrinthica strebeli Pfr. was described from Mirador, 

 Mexico, the specimens before me being from that locality. It was 

 well figured by Pfeiflfer in the Malakozoologischer Blatter viii, pi. 1, 

 figs. 5-8 ; but Crosse and Fischer's figures (Moll. Mex.) do not 

 represent it. They were probably drawn from a 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 is a large form, very abundant at many localities in 

 New York, Ohio, etc. Its prominent feature is the armature of 

 numerous short laraella,,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. 



Z' 



