182 BULLETIN OF THE 
fawn, darkest on the upper surface of the body, mantle, top of head, and eye- 
peduncles, gradually shaded off to a dirty white on the edge of the animal, 
side of foot, back of neck, and lower edge of mantle, and with a similar light 
line down the centre of back; foot dirty white, without any distinct locomo- 
tive disk ; edge of foot with numerous perpendicular fuscous lines, alternating 
broad and narrow; mantle minutely tuberculated, showing the form of the 
internal aggregated particles of lime, the substitute of a shell-plate, reddish 
fawn-color, with a central longitudinal interrupted darker band and a circular 
marginal similar band, broken in front, where it is replaced by small, irregu- 
larly disposed dots of same color; these dots occur also in the submarginal 
band of light color. Body reticulated with darker colored lines, running 
almost longitudinally, scarcely obliquely, toward the end of the tail, and con- 
nected by obliquely transverse lines of similar color, the areas included in 
the meshes of this network covered with crowded tubercles, as in Prophysaon 
Andersoni, shown in Plate IX. Figs I, J. Tail cut off by the animal. (See 
below.) Excepting its being of a deeper red, it agrees perfectly with Dr. 
Gould’s description. 
Mr. Hemphill writes of it: “I have to record a peculiar habit that is quite 
remarkable for this class of animals. When I found the specimen, I noticed 
a constriction about one third of the distance between the end of the tail and 
the mantle. I placed the specimen in a box with wet moss and leaves, where 
it remained for twenty-four hours. When I opened the box to examine the 
specimen, I found I had two specimens instead of one. Upon examination of 
both, I found my large slug had cut off his own tail at the place where I no- 
ticed the constriction, and I was further surprised to find the severed tail piece 
possessed as much vitality as the other part of the animal. The ends of both 
parts at the point of separation were drawn in as if they were undergoing a 
healing process. On account of the vitality of the tail piece, I felt greatly 
interested to know if a head would be produced from it, and that thus it would 
become a separate and distinct individual.” The animal on reaching me still 
plainly showed the point of separation from its tail (see Fig. A). The tail 
piece was in an advanced stage of decomposition, I have noticed the con- 
striction towards the tail in many individuals. The edges of the cut were 
drawn in like the fingers of a glove, after the excision. 
The tail of the foliolatus having been cut off, I was unable to verify the 
presence of a caudal pore from this individual. It was plainly visible in an- 
other specimen from Seattle. 
In the large Olympia individual, the irregularly disposed «particles of lime 
in the mantle, of unequal size, seemed attached to a transparent membranous 
plate. With care I removed this entire, and figure it. It is suboctagonal in 
shape (Plate VIII. Fig. B). Under the microscope it appears that the par- 
ticles of lime do not cover the whole plate; at many points they are widely 
separated. This aggregation of separate particles is the distinctive character of 
the subgenus Prolepis, to which foliolatus would belong if retained in Arion, 
