138 BULLETIN OF THE 



Zonites Rugeli W. G. Ein-k. 



riate II. Fj^s. H, I. IMatt- III. Fi;^ D. 



Shell depressed gloliose, iieil'nrHteil, tliiu, ilcliealt ly wiiiikleil, the apical 

 ■\vliorl.s .soiiu.'limes striate, ^reeiiisli iKirn-enlnreil, dai'k s]iuil<y abii\'e ; spire 

 sli;j;Iitly eli'Vated, apex Hat ; wlmrls C, sli-litly nnuidi/d, the last ij,lobose, 

 scarcely excaxatc'd at the perluration ; aperture lar^e, ruiiuded, ohli([ue ; peris- 

 tome siuiide, thin ; ends slii^htly a];proachiiig ; the columellar one scarcely 

 liruadi-iied. Diameter, lai-;^nT, 10 mm. ; lesser, 15 mm. ; hei.nht, L) mm. 



Zomka Uwjdi, W. G. r>iN\., Ann. N. Y. Acad. Sci., Vol. I. No. 2, p. 357, V\. XV. 

 Fig. II, ri. XIV. Fig. ]), 1879. 



Pioaii Mountain, ]\[itchell Co., Xorth Carolina. Mrs. Oonrge Andrews. 



When liist leceived, I helieved tins to he an extremely jj,lol)ose form of 

 Z. iiLoniatas, but an ex;imination of the liuL^ual 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 capnodcs, fria- 

 hilis, inornatus, Irrvifiatuft, and fuliij in osus. 



Jaw as usual in the genus. Lingual membrane as usual: teeth 3S-1-38. 

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

 the central line. It will lie se(.'n that iiKiriiattis, sithjilaiuis, and hirir/atus are 

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

 siis, capnoiJis, and friahilis, as well as Euijcli, have well-foiined laterals, dilfer- 

 ing in number iu 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 stipprcsstis. 



Some individuals have their apical whorls striate, as in Z. suh2)lanus. 



Zonites laBvigatus, Pfeiffer. (p. 102.) 



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

 slit as in Z. cnpnixh^, fri((J))li.'i, fiiliginnsus, Rugeli, and inoniutK.',. 



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



Zonites demissus, Binnev. (p. 101.) 



Found also at Cedar Keys, bdorida, and Ti'xasana, Texas. 

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

 gradual series of size from the typical demissus to accrrus. 



