138 BULLETIN OF THE 



Zonites Rugeli W. G. BINN. 



Plate II. Figs. H, I. Plate III. Fig. D. 



Shell depressed globose, perforated, thin, delicately wrinkled, the apical 

 whorls sometimes striate, greenish horn-colored, dark smoky above ; spire 

 slightly elevated, apex flat ; whorls 6, slightly rouuded, the last globose, 

 scarcely excavated at the perforation ; aperture large, rounded, oblique ; peris- 

 tome simple, thin ; ends slightly approaching ; the columellar one scarcely 

 broadened. Diameter, larger, 19 mm. ; lesser, 15 mm. ; height, 9 mm. 



Zonites Rugeli, W. G. BINN., Ann. N. Y. Aead. Sci., Vol. I. No. 2, p. 357, PI. XV. 

 Fig. H, PI. XIV. Fig! D, 1879. 



Roan Mountain, Mitchell Co., North Carolina. Mrs. George Andrews. 



When first received, I believed this to be an extremely globose form of 

 Z. inornatus, but an examination of the lingual dentition showed this to be 

 impossible. 



I have given a figure of the genitalia. It will be seen that the accessory 

 part of the penis-sac is in this species continued to a point beyond the retrac- 

 tor-muscle : otherwise the genitalia are very similar to these of capnodes, fria- 

 bilis, inornatus, Icevigatus, and fuliginosus. 



Jaw as usual in the genus. Lingual membrane as usual : teeth 38-1-38. 

 There are about 4 or 5 laterals ; the 8th is a pure marginal on either side of 

 the central line. It will be seen that inornatus, subplanus, and Icevigatus are 

 peculiar in having no perfect lateral teeth, but only transition teeth : fuligino- 

 sus, capnodes, and friabilis, as well as Rugeli, have well-formed laterals, differ- 

 ing in number in. the various species : thus the lingual dentition in this group 

 is a good guide in distinguishing the species. 



The animal is dark slate-colored : the caudal mucus-pore is a longitudinal 

 slit, as in suppressus. 



Some individuals have their apical whorls striate, as in Z. siibplanus. 



Zonites Isevigatus, PFEIFFER. (p. 102.) 



The caudal mucus-pore seems to be round, and not a simple longitudinal 

 slit as in Z. capnodes, friabilis, fuliginosus, Rugeli, and inornatus. 



The globose variety shares with the type the peculiar lingual dentition. 



Zonites demissus, BINNEY. (p. 104.) 



Found also at Cedar Keys, Florida, and Texasana, Texas. 

 From the mountains of North Carolina and Tennessee I have received a 

 gradual series of size from the typical demissus to acerrus. 



