138 BULLETIN OF THE 



Zonites Rugeli W. G. T>iss. 



Plate II. Fi;,'s. H, I. Plate III. Fi;;. D. 



Shell (Icprosseil l^IuImisc, peiTuratud, lliiii, (K-liral^ly wn'iikk'd, the apical 

 wliorl>; soin(;tiiiU's striate, ^n-ciiisli li(ini-cnl(iri-il, dark sinol<y abuxe ; spire 

 sli^'litly elevatud, apex flat ; wIidiIs C, sliglitly rmuidi-d, the last .i^hibose, 

 scarcely excavated at tlie pcrl'dratiuii ; apei'ture large, louudid, (ililii[iu' ; ]ici'is- 

 tome simple, thin ; ends sliL;'litly a]>proacliing ; the cdluiiicllar (Uie scarcely 

 liruadeui-d. J)ianietrr, laiger, ID nnn. ; los^r, I'j nun. ; height, !) mm. 



Zonites Rugeli, W. G. Binx., Ann. N. Y. Acad. Sci., Vol. I. Xo. 2, p. 357, PL XV. 

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



Enan INlimntain, ]\liti'liell C'd., Xnrth Carolina. ^Mrs. George Andrews. 



When first icccived, I hcdicved this to he an extremely globose form of 

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

 impossible. 



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

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

 tor-muscle : otherwise the genitalia are very sinular to these of capnodcs, fria- 

 bilis, i/iDrniitus, Ifrvigatiis, undfidifjiiinsus. 



Jaw as usual in the genus. Lingual nuanbrane as usual : teeth .3^-1-38. 

 There are about 4 or .5 laterals ; the 8th is a ]iure nunginal on lilher side of 

 the central line. It will be seen that iiKJiimtits, suhjilniin.-^, imd In riijatus are 

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

 sus, c((pno<h:S, and friabili.'i, as well as Ji'uijili, ]ia\-e well-foiiued laterals, diU'er- 

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

 is a good guide in distinguishing the .si)ecies. 



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

 slit, as in ifiipprcssHs. 



Some individuals have their apical whorls striate, as in Z. suhjjla^ms. 



Zonites laevigatus, Pkeh-fer. (p. 102.) 



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

 slit as in Z. cupnoJi.'i, frutbilis, fulighiosus, liugeli, and iiioniutn,',. 



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



Zonites demissus, Rinnkv. (j). lOt.) 



Found also at Cedar Keys, I'dorida, and Texasana, Texas. 

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

 gradual series of size from the typical demissus to accrrus. 



