362 North American Species of Zonites, etc. 



Buliminus Natalensis, Kr., var. Draakcnsburgensis, E. Smith. 



Cape Town, South Africa, Mr. J. S. Gibbons. 



The species is placed by Von Martens in the subgenus Pach- 

 nodus of Buliminus. 



The jaw is very thin, slightly arched, low ; ends blunt ; scarcely attenu- 

 ated ; anterior surface with above forty ill-defined, fiat, crowded ribs, 

 scarcely denticulating either margin. 



Lingual membrane (pi. XIV, tig. J) long and narrow. Central teeth tri- 

 cuspid ; laterals bicuspid ; marginals quadrate, with one long, large, oblique 

 inner cutting point, and one outer bifid cutting point. There are 54-1-54 

 teeth, with about 14 laterals on each side of the central line. 



Explanation of Plate XIV. 



Fig. A Vitrinizonites latissimus, animal in motion, not fully extended : 



drawn by Miss Emma Pringle. 

 B " " genitalia. 



C Zonites capnodes, genitalia. 

 D " Rugeli, " 



E Mesodon Andrewsi, " 

 F " " lingual membrane. 



G Mesodon dentifera, genitalia. 



H Helix rariplicata, central, adjacent laterals, and inner marginals. 



I Rhytida vernicosa, Kraus, dentition. 



J Buliminus Natalensis, lingual membrane. 



K Helix globulus, lingual membrane. 



L Glandina, — dentition (see p. 355). 



Explanation of Plate XV. 



Fig. A. Zonites placentula, Shuttl. 



" B " macilentus, Shuttl. 



" C " cuspidatus, Lewis. 



" D " Andrewsi. 



" E " lasmodon, var. ? (see. p. 358) 



" F " multidentatus, Binn. 



" G " significans, Bland. 



" H " Rugeli. 



" I Dentition of same. 



"J " " Zonites subplanus, Binn. 



" K " " Stenopus ? decoloratus 



" L Mesodon Andrewsi, 



" M Macrocyclis Hemphilli. 



" N Spiraxis Dunkeri, Pfr., dentition. 



The figures of shells on this plate were dra w n from nature by Mr. Arthur 

 F. Gray, of Danversport, Mass., — those of dentition by W. G. B. 



