MUSEUM OF COMPARATIVE ZOOLOGY. 223 



Fig. 3. Limax Hemphilli. A central tooth with two adjacent laterals ; an outer 



lateral tooth ; two outer marginal teeth. 

 Fig. 4. Limax Hewstom. A central tooth with adjacent lateral on either side ; 



incorrectly numbered on the plate ; two extreme marginals. 

 Fig. 5. Microphysa dioscoricota (see p. 196). 



PLATE III. 



Fig. 1. Prophysaon Andersoni, J. G. C, received from Dr. Cooper. 

 Fig. 2. Pupil/a Floridana, Dall, from original figure. 



Fig. 3. Genitalia of Hemphillia, from Old Mission, Cceur d'Alene, Idaho (see 

 p. 217):- 



t. testicle. 



ep. epididymis. 



ov. ovary. 



ovid. oviduct. 



pr. prostate. 



g. b. genital bladder. 



d.g. b. duct of same. 



v. d. vas deferens. 



r. retractor muscle of penis. 



p. s. penis sac. 



or. common orifice. 

 Fig. 4. Helix exigua, from an original drawing by Dr. Stimpson. 

 Fig. 5. Zonites lasmodon, Phillips, enlarged. Drawn by Miss Helen E. Lawson. 

 Fig. 6. Central portion of jaw of Microphysa dioscoricola, greatly enlarged. 

 Fig. 7. Bulimus Floridanus (see p. 201). Drawn from original specimen in Mr. 



Cumings's collection, by G. B. Sowerby. 

 Fig. 8. Lingual dentition of Polygyra hippocrepis. 



a. central and two lateral teeth. 



b. marginal teeth. 

 Fig. 9. Bidimus Hemphilli. 



Fig. 10. Dentition of Onchidium Floridanum. 



PLATE IV. 



Fig. D was drawn .by W. G. Binney, the other figures by Arthur F. Gray : all 

 from life. 



Fig. A. Hemphillia glandulosa, twice the natural size. 



Fig. B. The same ; animal in motion, natural size ; the slit on the mantle par- 

 tially open. 



Fig. C. The same ; partially contracted and at rest. 



Fig. D. The same; the very young animal. 



Fig. E. The same ; dorsal view of posterior portion of the animal, twice the nat- 

 ural size; pore closed 



Fig. F. The same ; lateral view, pore closed. 



