THE NAUTILUS. 79 



Prophysaon andersoni (Cooper). 



An alcoholic from Olympia was described thus: Twenty four 

 mm. long. Sole yellowish-white. Oblique grooves as in foliolatus. 

 Markings on edge of sole as in hemphilli B. & B., but not so dark. 

 Body same color as hemphilli, but paler at sides ; in fact, white 

 above sole at sides. Reticulations as in hemphilli, showing out 

 lilac-gray on the whitish sides. Pale (rather brownish) dorsal line. 

 No indication of any keel. Body much less tapering than in 

 hemphilli. No mucus pore. Mantle smaller and more rounded at 

 ends than in hemphilli, decidedly brownish, its edges pale. There 

 are indistinct subdorsal bands on mantle. Ovotestis imbedded in 

 liver ; in fasciatum it is visible without moving liver. 



A living P. andersoni from Haywards, California, sent by Dr. 

 Cooper, agreed with the above, but differed in its mantle, which was 

 not brown but grayish, heavily marbled with dark gray dorsally, so 

 as to appear almost uniform blackish, and at sides with dark gray 

 or blackish marbling showing out plain on the pale ground. The 

 surface of the mantle is beautifully beaded-granular. The pale dor- 

 sal line is brownish tinged, thus differing from the rest of the body. 



The epiphallus of P. andersoni v. suffusa, from Chehalis, Wash., 

 is very stout, shorter than that of typical andersoni. 



Prophysaon humile. 



A Coeur d'Alene example, compared with fasciatum, differs thus : 

 Sole gray instead of yellowish. Transverse wrinkles not oblique. 

 Grooves on edge not dark. Reticulation practically the same. 

 Dorsal band on body much reduced. Ground color grayish. 



Prophysaon fasciatum. 



Specimens in alcohol were sometimes tinged with scarlet, but I 

 could not be sure whether this was natural or due to some acci- 

 dental staining. 



In conclusion, I hope it will not be supposed that all the charac- 

 ters above given are believed by the writer to be specific. The pur- 

 pose is, simply to point out differences between the specimens which 

 have been differently named, without deciding how far those differ- 

 ences are specific. In my Check-List of Slugs, and elsewhere, I 

 have indicated my opinion about the species as such. 



Mesilla, New Mexico, Sept. 15, 1896. 



