84 THE NAUTILUS. 
lacking entirely, there being one broad dorsal band of darker 
reddish brown, bounded on each side by a narrow row of more 
or less connected black spots. 
{n the eighteen specimens of this lot examined, all possessed 
a rudimentary shell. In many cases, in spite of the greatest 
care in making the incisien in the mantle, the shell had become 
dislodged from its normal position. In eight specimens it re- 
mained attached to the animal when found. In all of these 
specimens it was adherent to the outer surface of the inner 
membrane or peritoneum, and not connected in any way to the 
inner surface of the mantle. It also, in the specimens in which 
it remained fastened, was always in the posterior quarter of the 
animal, and over some portion of the liver. In two of the 
eight specimens it occurred on the left side, in two directly on 
top, and in four on the right side of the liver. The diagram 
(fig. 1) was made from a specimen (M. C. Z. 48211 H) meas- 
uring 40 mm. in length in a considerably contracted condition. 
On opening the mantle, the position of the shell was found to 
be 5mm. from the posterior extremity of the animal and on 
Shh, \, ae 
4 
.Olmm. 
Figs. i, 2,3, Philomycus carolinianus (Bose), Hudson, Ohio. 
Fig. 4, P. rushi, n. sp. 
ihe right side. It is of a light horn color, transparent, very 
iridescent, thin, delicate, wrinkled. It measures .5 mm. in 
length and .25 mm. in width. In appearance it greatly re- 
Ye ee 
: 
i 
