eae 
THE NAUTILUS. 83 
ation. In comparing them with Iimax and Arion, he did not 
find the mantle shield much shorter than the body, and plainly 
evident, like the one of those slugs, and came to the conclusion 
that there was none at all; conceded that it was one of the care- 
less things he was in the habit of doing. Also, if Philomycus 
was not the same thing as Tebennophorus, etc., the family name 
Philomycide, in the sense as used, has no claim for recognition. 
THE SHELL OF PHiILOMYCUS CAROLINIANUS (BOSC). 
BY WILLIAM F. CLAPP. 
Through the kindness of Mr. J. Henry Blake I recently re- 
ceived a specimen of Philomycus carolinianus (Bosc.), from 
Munsonville, N. H., to examine for internal parasites. On 
laying open the mantle preparatory to removing the stomach 
and intestine, I discovered a rudimentary shell. When first 
noticed, it was not attached, either to the mantle or to the 
inner membrane which covers the viscera, but was floating free 
in the liquid in which the dissection was made. From its posi- 
tion I believed it to have been dislodged from some portion of 
the posterior fourth of the animal, between the mantle and the 
inner membrane. Losing immediately all interest in possible 
internal parasites, I gave my attention entirely to the problem 
of the shell, in an endeavour to ascertain its exact position, and 
also to discover whether it is to be considered a constant, or 
merely an occasional character in this species. 
From Dr. R. C. Rush, of Hudson, Ohio, I received fifty 
specimens (M. C. Z. 48211) of living Philomycus in excellent 
condition. The specimens in this lot show slight variation in 
color, the majority being of the typical pattern, of a yellowish- 
white ground color, variegated with brownish and _ blackish 
clouds and spots, forming three ill-defined longitudinal bands, 
one on the center of the back, and one on each flank. There 
are, however, three specimens easily separated from the rest be- 
cause of the reddish tinge in the brownish clouds and spots. 
In these specimens (M. C. Z. 48211 H) the lateral bands are 
