1898.] NATURAL SCIENCES OF PHILADELPHIA. 261 



Fig. 74. The same, showing main ramifications of excretory canals 



in kidney. 

 Fig. 75. Anadenulus Cockerellii (Hemp.). 

 Fig. 76. Aphallarion Buttoni Pils. & Van. 

 Fig. 77. Hesperarion niger (J. G. Coop.). Mus. no. 71,078. 

 Fig. 78. Hemphillia camelus Pils. & Van. 

 Fig. 79. Avion hortensis Fer. Specimen from Seattle, Wash. 



Mus. no. 68,023. 

 Fig. 80. Prophysaon foliolatum (Gld.). Specimen from Seattle. 



Wash. Mus. no. 71,073. 

 Fig. 81. Ariolimax columbianus (Gld.) End of tail, lateral view. 

 Figs. 82, 83. Avion hortensis Fer. Seattle, Washington. 

 Fig. 84. Hesperarion niger (Coop.). Oblique view of end of tail, 



showing pore. 



Plate XVI. 



Fig. 85. Hemphillia camelus Pils. & Van. Central, first lateral, 



and three marginal teeth. 

 Fig. 86. Prophysaon cozruleum Ckll. Group of outermost marginal 



teeth. 

 Fig. 87. Binneya notahilis Coop. Jaw. 

 Fig. 88. Binneya notabilis Coop. Teeth. 

 Fig. 89. Prophysaon Andersoni (Coop.), var. ? Mus. no. 71,647. 



Cascade Springs, Washington. 

 Fig. 90. Proj)hysaon foliolatum (Gld.). Typical form. Central, 



first lateral, and group of marginal teeth. 

 Fig. 91. Prophysaon fasciatum Ckll. Central, first lateral and 



group of marginal teeth. 

 Fig. 92. Prophysaon Andersoni (Coop.). Jaw. San Juan Island. 



Mus. no. 63,912. 

 Fig. 93. Outer marginal and lateral teeth of same individual. 

 Fig. 94. Prophysaon fasciatum Ckll. Jaw. Mus. no. 68,026. 



Seattle, Washington. 

 Fig. 95. Much magnified portion from median part of another 



similar jaw of the same species. 

 Fig. 96. More enlarged basal margin of same. 

 Fig. 97. Prophysaon humile Ckll. Much magnified portion of 



the basal margin of a striated jaw. Seattle, Washington. 

 Fig. 98. Prophysaon foliolatum (Gld.). Jaw. Mus. no. 71,072. 



Seattle, Washington. 



