484 PROCEEDINGS OF THE ACADEMY OF [Juty, 



in length. Its retractor muscle is long and slender (PI. XXXVII, 

 fig. 7). Epiphallus 12 mm. long. 



The radula examined (PI. XXXIX, fig. 1) has 36, 1, 36 teeth. 

 The basal-plates are very long, the cusps arising far backward, about 

 the middle of the plates, about as in M . andrewsce and M . inornatus. 

 Two or three teeth on each side may be reckoned laterals, having 

 well-deve'oped side cusps and cutting points; the next is transi- 

 tional, the rest marginals. The marginal teeth are closely crowded, 

 with long slender cusps, longer than in other species of Mesomphix, 

 and more like those of some Omphalinas. Binney found 37, 1, 37 

 teeth in a Roan Mountain specimen, agreeing in form with my 

 figure except that the basal-plates are a little shorter. 



The large number, closely crowded and long cusps of the marginal 

 teeth are characteristic of this species. 



Mesomphix rugeli (W. G. Binn.). 



Zonites rugeli W. G. B., Ann. N. Y. Acad. Sci., I, p. 357, pi. 15, f. H (shell), 

 I (teeth), pi. 14, f. D (genitalia). 



Type locality, Roan Mountain, Mitchell County, N. C. The 

 individual I dissected was collected there. 



The mantle is unpigmented or of a diffuse smoky color, darker 

 near the collar. The male organs (PI. XXXVII, fig. 9) do not differ 

 materially from M. subplana. Binney's figure shows the epiphallus 

 arising too near the base of the penis, but its real insertion is not 

 far from the middle. Length of penis 8, epiphallus 9.5 mm. 



The radula examined (PI. XXXIX, figs. 2, 3) has 41, 1, 41 teeth, 

 of which about 4 or possibly 5 on each side are laterals, with well- 

 developed cusps and cutting points. The central tooth has a wider, 

 shorter basal-plate than in allied species, more like that of Omphalina. 

 The intermediate marginal teeth are rather stout and ungraceful 

 (fig. 3, left side). The outer ones decrease rapidly to the outer 

 edge of the radula (fig. 2). The radula figured has an abnormal 

 row of teeth on one side, the second lateral having a double ectocone. 

 The teeth are all shorter than in M. subplana. Binney records 

 38, 1, 38 teeth, with 4 or 5 laterals, the form of the individual teeth 

 being as figured by me. 



This species is quite distinct by the short form of the central teeth 

 and the comparatively large number of lateral and marginal teeth. 



Mesomphix rugeli oxycoccus (Vanatta). 



Omphalina rugeli oxycoccus Vanatta, Nautilus, XVI, p. 106, January, 1903. 

 Cranberry and Banners Elk, N. C. 



