118 THE NAUTILUS. 



midway of the mantle. Behind the mantle there is a short 

 median impressed line, flanked by obliquely decurrent lines ; 

 followed posteriorly by irregular, coarse granulation, the end of 

 the tail then becoming carinate. The pedal furrows rise be- 

 hind, as in H. cavielus, and there is no horn above their junc- 

 tion, and no specialized caudal mucous pore. The shell consists 

 wholly^of yellow periostracum, whatever lime it contained hav- 

 ing been dissolved by the preserving fluid (formaldehyde). The 

 mantle is smooth. Total length preserved in formaldehyde 33 

 mm.; length of mantle about 16 mm.; width of the sole 4.3 

 mm. Length of the shell about 10.5 mm. 



The short penis (pi. 4, fig. 9) is produced laterally in 

 an ample pocket which contains a large "papilla" attached 

 distally, as shown by dotted line in the figure. There are also 

 some smaller fleshy processes. The penial retractor (r. p.^ is 

 inserted at the origin of the epiphallus {epi.), as in H. cavielus. 

 The duct of the spermatheca (sp. ) is narrow, as in H. glandulosa. 

 H. danielsi Vanatta (Proc. A. N. S., Phila. 1914, p. 367) from 

 Montana differs externally by having a smaller shell pore, and 

 internally by the entirely different shape of the penis, with the 

 penial retactor inserted on the epiphallus. The duct of the 

 spermatheca is wide. The organ figured as a penial gland, in 

 Mr. Vanatta' 8 fig. 2, is apparently homologous with the large 

 lateral penial pocket or sack of H. malonei. 



Locality, Tawney's Hotel, on the Salmon River, 12 miles 

 from Mt. Hood. Collected by J. G. Malone, August, 1916. 

 Collection Acad. Nat. Sci., Phila., No. 115577. 



This species resembles H. camelus in external appearance and 

 by having the penial retractor inserted at the apex of the penis. 

 It is more like H. glandulosa in the shape of the penis and the 

 slender duct of the spermatheca. 



One of the specimens had been extensively gnawed, evidently 

 by the type specimen. Another, which had been confined in 

 the same box, disappeared. Probably the survivors knew 

 where their companion went. 



Mr. Malone found the following snails in the same neighbor- 

 hood : 



Ariolimax sp. (common, but not collected). 



