260 PROCEEDINGS OF THE ACADEMY OF [1898. 



Fig. 51. Prophysaon eoeruleum Ckll. Seattle, Washington. 

 Figs. 52, 53. Prophysaon eoeruleum Ckll. Olympia, Washington. 



The pedicel of epiphallus is seen in fig. 53. 

 Fig. 54. Prophysaon Andersoni (?) var. Cascade Springs, Wash- 

 ington. Mus.no. 71,647. 

 Fig. 55. Prophysaon foliolatum (Gkl.). Seattle, Washington. 



Mus. no. 71,072. Typical form. 

 Fig. 56. The same. Median transverse section of the epiphallus. 

 Fig. 57. Prophysaon foliolatum (Gld.). Another specimen from 



the same locality. 

 Fig. 58. The same, a smaller specimen not mature. 

 Fig. 59. Prophysaon Andersoni (Cooper). Oakland, Cal. Mus. 



no. 69,010. 

 Fig. 60. Prophysaon Andersoni (Cooper). California. Mus. No. 



71,071. Received from W. G. Binney as P. Hemphilli B. & B. 

 Fig. 61. Prophysaon Andersoni (Cooper). Oakland, Cal. Mus. 



no. 69,010. 

 Fig. 62. Prophysaon Andersoni (Cooper). Spermatophore. 



Plate XIV. 



[The retractor muscle systems are all represented as seen from be- 

 neath, ao, aorta ; c. a., cephalic artery ; e. r., eye retractor ; G, 

 intestine ; I. t. r., left tentacle and eye retractor ; ovid. r., re- 

 tractor of the oviduct; p, penis; ph. r, pharynx or buccal re- 

 tractor ; ret., retensor muscle ; r. p., penis retractor ; r. s., rad- 

 ula sack ; r. t. r., right tentacle retractor ; sp. r, retractor of the 

 spermatheca ; t r, tentacle retractor ; vag., vagina ; vag. r., va- 

 ginal retractor ; v. a, visceral artery.] 



Figs. 63, 64, 65. Binney a notabilis Cooper. Guadalupe Island. 

 Ventral and lateral aspects of an alcoholic specimen, and the 

 retractor system. 



Fig. 66. Ariolimax Columbianus (Gld.). 



Fig. 67. Aphallarion Buttoni Pils. & Van. 



Fig. 68. Anadenulus Cocherelli (Hemph.). 



Fig. 69. Hemphillia camelus Pils. & Van. Mus. no. 63,926. 



Fig. 70. Prophysaon foliolatum (Gld.). Mus. no. 71,073. 



Fig. 71. Hesperarion niger (Cooper). Mus. no. 71,078. 



Fig. 72. Arion hortensis Fer. Seattle, Wash. Mus. no. 68,023. 



Plate XV. 



[Pallial organs, seen from below, the diaphragm removed, a, auri- 

 cle ; ao, aorta ; k, kidney ; I, lung; p. a., pulmonary or breath- 

 ing aperture; ph.r., pharynx or buccal retractor muscle; p.v, 

 pulmonary vein ; r, G\ rectum ; r. t r, right tentacle retractor ; 

 ur, secondary ureter ; v, ventricle.] 



Fig. 73. Ariolimax Columbianus (Gld.). Maculated specimen from 

 near Oakland, California. Pallial region from below, with 

 pulmonary net work of the lung roof. 



