1876. ] NATURAL SCIENCES OF PHILADELPHIA. i) 
Bulimulus noticed within the United States having this peculiar 
type of dentition. 
Genitalia figured on pl. VI., fig. N. Penis sac very long and nar- 
row, ending in a flagellum: vas deferens entering at about the 
anterior fourth of its length. Genital bladder oval, on a long, 
narrow duct. No accessory organs. 
Bulimulus Edwardsi, Mor. 
Lake Titicaca. Prof. Alex. Agassiz. 
Jaw low, arcuate, ends rapidly acuminated, blunt: anterior sur- 
face with over ten distant ribs, some of the usual Helzx type, others 
like the plait-like processes, common in Cylindrella, Bulimulus, 
Geotis, Amphibulima, etc. 
Lingual membrane (pl. VI., fig. pp) with 44-1— 44 teeth. Cen- 
trals of the usual Helicine type, tricuspid: laterals like centrals, 
unsymmetrical, and consequently bicuspid. The change to mar- 
ginals very gradual, and formed by the simple modification of the 
laterals, without any splitting of the inner cutting point. 
Succinea ovalis, Gould, not Say. 
Burlington, New Jersey. 
Teeth over 60—1—60. Fig. 6 represents extreme marginals 
(pl. VI., fig. a). 
Jaw with smooth anterior surface and prominent median pro- 
jection to the cutting edge. 
EXPLANATION OF PLATE VI. 
Fig. A. Lingual dentition of Succinea ovalis. 
Fig. B. ge Arionta Mormonum. 
Fig. C. ee Zonites inornatus. 
Fig. D. es cs **  fuliginosus. 
Fig. E. Onchidella borealis. 
Fig. F. Genitalia of Limax Hewstoni. 
Fig. G. Jaw of Carelia bicolor. 
Fig. H. Genitalia of Glyptostoma Newberryanum. 
Fig. I. ce Mesodon major. 
Fig. J. Lingual dentition of Turricula tuberculosa. 
Fig. K. Dart of B. 
Fig. L. Calcareous concretions of B. 
Fig. M. Jaw of Bulimulus Dormani, central portion. 
