48 THE NAUTILUS. 
Phenacarion being very properly suppressed. Prophysaon pacificum 
is referred to P. andersoni, a proceeding I had not expected, but 
which is probably correct. In this ease P. andersoni v. pacificum 
will be the name of the yellow variety, the type being greyish—a 
dichroism like that offered by the European Avion subfuseus Drap. 
A more perplexing question relates to the probable identity of P. 
humile and fasciatum. These slugs are practically alike, except that 
the former has the jaw striate, while in the latter it is plicate or rib- 
bed. It appears that they occur together at Seattle, so it is hard to 
consider the difference as due to anything but variation; yet it is 
certainly a curious case. In Philomycus such differences appear to 
have specific value. 
Phenacarion hemphilli W. G. B., is provisionally regarded as a 
synonym of Proph. foliolatum. It is probably a variety distinguished 
by having yellow slime covering the body. Arion subfuscus has 
such a form, which is quite distinct from the one having a yellow 
skin, as in P. pacificum. 
While the authors had a considerable amount of material at their 
disposal, it is evident that the region occupied by these slugs has by 
no means been adequately searched. Not only may it be possible 
to define several subspecies or races of Proph. andersoni, but further 
new species, and even genera, may be discovered. Anadenulus is 
still only known from one locality, where it was found by Hemphill, 
and the distribution of most of the species is quite limited ; so there 
is plenty of room for striking novelties in those parts of the Pacific 
coast region where the foot of the sluggist has never trod. 
In the East, those who will hunt in gardens and greenhouses 
ought surely to turn up some of the European species of Arion, in 
addition to A. hortensis—T. D. A. Cockerell. 
DESCRIPTIONS OF TEN New SpercriEs OF TERRESTRIAL MOL- 
LUsCA FROM SoutH Arrica.”. By James Cosmo Melvill and John 
Henry Ponsonby.—The new species of this installment are mainly 
Enneas. A new Dorcasia, D. isomerioides, is described, the new 
subgenus Tulbaghinia being instituted for it. Another Achatina 
is described. The richness of the fauna of South Africa, made 
known through the researches of Messrs. Melvill and Ponsonby, is 
remarkable. 
