NATURAL SCIENCES OF PHILADELPHIA. 253 
p. Prostate. 
v. d. Vas deferens. 
. s. Penis sac. 
r. Retractor muscle of last. 
or. External orifice of genitalia. 
g. b. Genital bladder. 
‘ v. Vagina. 
Fig. 1. Genitalia of Partula. 
IMG | PA i H. Sagemon, Beck. 
Fig. 3. i H. auricoma, Fér. 
Fig. 4. Lingual dentition of Partula amanda, Pease. The last 
figure is the extreme marginal in profile. 
Fig. 5. Jaw of Partula. 
Hiew 6. <  “* Partula eracilis, Pease. 
Fig. 7. Genitalia of Partula umbilicata, Pease. 
Fig. 8. . *¢ P. virginea, Pease. 
lier, ss “© P. fusca, Pease. 
Fig. 10. i" “ P. bilineata, Pease. 
Fig. 11. Jaw of P. virginea, Pease. 
PLATE XX. 
Lingual dentition and jaw of :— 
Fig, 1. Nanina subcircula, Mousson. 
ig. 2, 3. Stenogyra hasta, Pfr. 
g. 4. Helix vortex; Pfr. (See p. 180.) 
ig. 5. Helix septemvolva, Say. (See p. 208.) 
Fig. 6. Cylindrella elegans, Pfr. 
Fig. 7. Succinea Stretchiana, Bland. (See p. 232.) 
Fig. 8. Helix pyrozona, Phil. 
Fig. 9. Macroceramus turricula, Pfr. 
Fig. 10. Holospira Goldfussi, Pfr. (See p. 183.) 
; 14. The extreme figure is drawn from another portion of 
the membrane, where the cusps are more highly de- 
veloped. 
Fig. 11, 12. Helix astur, Souv. 
Puate XXI. 
Jaw and lingual dentition of :— 
Fig. 1,2. Helix Arangiana, Poey. 
Fig. 3. Macrocyclis euspira, Pfr. 
