MUSEUM OF COMPARATIVE ZOOLOGY. 998 
Janulus bifrons, Lown. 
Madeira. Dr. Hillebrand to Dr. Neweomb. 
Jaw smooth with median projection. 
Lingual membrane with 34-1-34 teeth, of which 4 on each side are laterals, 
All as in Zonites, i. e. centrals tricuspid, laterals bicuspid, marginals aculeate. 
VITRINIZONITES, n. g. 
Animal heliciform, blunt before, in motion greatly acuminated behind: 
mantle subcentral, protected by an external shell: two longitudinal furrows 
above the margin of the foot, meeting over a round caudal mucus pore : distinct 
locomotive disk to foot: external orifice of combined generative organs on 
right side of body, far behind the eye-peduncles ; of respiratory and excre- 
tory organs on the right of the mantle under the peristome : jaw smooth with 
median projection : lingual membrane (Pl. II. Fig. H) as in Zonites, central 
teeth tricuspid, lateral teeth bicuspid, marginals aculeate. 
Shell external, Vitrina-like. 
The above generic name is proposed for the shell described as Vitrina latis- 
sima (see Terr. Moll. U. S., V. 136, Fig. 51), as it combines the characters of 
Vitrina and Zonites. The animal differs from Vitrina by having simple, not 
bifid marginal teeth to the lingual membrane, and by a caudal mucus pore with 
longitudinal furrows above the margin of the foot, and by the want of an 
appendiculate mantle, From Zonites it differs only in the form of the shell, 
though the caudal mucus pore seems to be circular, with projecting process 
when open, rather than a simple longitudinal slit, as in the Zonites suppressus. 
There appears no developed appendiculate mantle process. 
I am indebted to Miss Annie E. Law for the opportunity of examining the 
specimen. She collected it in June, 1879, at the original locality, Bald Moun- 
tain, Blount Co., Tenn., on dividing line with North Carolina, At Washing- 
ton Co., Tenn., it was found by Dr. Rugel. Mrs. G. Andrews found it on Roan 
Mountain, in North Carolina (over 6,000 feet), on the dividing line with Carter 
Co., Tenn. 
The lingual membrane is broad and not long, the ends are bluntly truncated, 
There are about 30 rows of 24-1-24 teeth each, arranged as in Zonites. There 
are six laterals, scarcely one perfect, mostly transition teeth, on each side of the 
central line ; the seventh tooth is a marginal, the twelfth tooth is the largest. 
Plate II. Fig. H shows all the various forms of teeth on the membrane, 
Urocyclus Kirkii, Gray ? 
T am indebted to Mr. J. S. Gibbons for the opportunity of examining a curi- 
ous slug collected by him in Mozambique. He suggests that it may be Urocy- 
clus Kirkii, Gray (Proc. Zoól. Soc., 1864, p. 250). He thus describes, in the 
Quarterly Journal of Conchology, the living animal : — 
“ Body slender, tapering, keeled, with a sharply pointed tail; on each side of 
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