ag i) THE NAUTILUS. 
meeting in a longitudinal median groove, which divides the foot into 
two portions. Liver pale grayish. “ Uniform tawny as is Limax 
flavus. It stretches itself out in a worm-like shape unlike other 
species. Internal shell plate, jaw and tongue as in Andersoni.” 
(W. G. Binney.) 
Gray’s Harbor, Washington. (Hemphill, 1889.) 
This is probably a variety of P. pacificum. 
Prophysaon ceruleum, n. sp. 
Length (in alcohol) 223 mill, in motion, 43 mill. Body and 
mantle clear blue-gray, paler at sides, sole white. Mantle finely 
granulated, broad, without markings. Length of mantle 7 mill., 
breadth 5 mill. — Respiratory orifice 22 mill. from anterior border. 
Body subcylindrical, tapermg, pointed. (In one specimen eaten off 
at the end.) Distance from posterior end of mantle to end of body, 
10% mill. 
The reticulations take the form of longitudinal equidistant lines, 
occasionally joined by transverse lines, or coalescing. Sole not 
differentiated into tracts. Jaw pale, strongly ribbed. Liver white. 
Mr. Binney sends me colored drawings of the living animal; the 
neck is long and white, or very pale. Mr. Binney has examined 
the jaw and lingual, and finds them as usual in the genus. Several 
specimens were sent from Olympia, Washington Ter., from Mr. 
Hemphill to Mr. Binney. 
P. ceruleum is an exceedingly distinct species, distinguished at 
once by it color and the character of its reticulations. 
Prophysaon ceruleum var. dubium n. var. 
Length (in alcohol) 8 mill. Length of mantle 4 mill. Distance 
from posterior end of mantle to end of body 34 mill. Mantle broad, 
with four bands composed of coalesced black marbling, very ir- 
regular in shape, and running together anteriorly. Body dark, 
tapering. Sole pale, its edges gray. Liver white. 
With the P. cerulewm is a small dark slug, probably a variety of 
it, but differing as described above. — It will easily be distinguished 
by its blackish color and the peculiar markings on the mantle. 
Prophysaon humile Cockerell, n. sp. 
Length (in alcohol) 162 mill. | Body above and mantle smoke- 
color, obscured by bands. Mantle wrinkled, and having a broad 
dorsal and two lateral blackish bands, reducing the ground-color to 
two obscure pale subdorsal bands. Length of mantle 7 mill., breadth 
