, 
528 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 
scutum. Antenne pilose, rather robust, 7-joimted, 5th longest; next 
longest in the 3d joint, then the 4th, 2d, 6th, Ist, and 7th, which last is 
provided with two or three blunt, tactile processes at the tip. Segments 
02, including the head; an impressed dorsal line as in Spirostrephon 
cesioannulatus. Delicate and numerous impressed lines on the hind 
margins of the dorsal scutes. Six bristles surmount each scute; two are 
placed obliquely on each side, and another is closer to the median line 
on each side; the upper ones on the four penultimate segments are at 
or near the posterior margin, and are shorter, blunter, and stouter; two 
of them project backwards from the margin of the preanal scute. Ap- 
parently no pores. Forty-seven pairs of legs in ¢, of which 45 are 
of the normal shape; Ist, 2d, 5d, 4th, and Sth gradually longer; a 
wide interval between the 5th and 6th pairs, the latter very robust, the 
dd joint being much swollen and somewhat flattened inside, with the 
terminal and basal joints stouter than in the remaining legs; 7th pair 
weak, but normal; place of copulatory apparatus in the position of the 
Sth; 9th pair 2-jointed, with basal joint very short, while the 2d is four or 
five times as long and greatly swollen, looking in shape like a minute 
melon, and is extended horizontally outwards the same as the similar 
pair of organs in Trichopetalum. Yorty-eight pairs of legs in 2 ; appen- 
dages of 3d segment aborted as usual; sexual openings bounded laterally 
by rounded elevations. Normal posterior legs slender and pilose. The 
bristles on the back of the animal are received into basal sockets, and 
when removed give the appearance of a pore with an elevated rim. A 
yellowish substance adheres to the hairs in drops or beads in alcoholic 
specimens, which may be the offensive secretion of the animal which 
has exuded at the base of the bristles, though there is none of the char- 
acteristic odor apparent to the smell. Length of the anunal 8.5", Color 
nearly white. 
Of the above singular form I have received four specimens, three 
males and one female, which were sent me by Dr. C. A. White, who ob- 
tained them from the owner of Luray Cave, in Virginia, who had eol- 
lected them in the cavern himself. Some time last summer he sent me 
specimens which, upon being subjected to a test with acetic acid, proved 
to be only a calcareous crust which had been deposited over dead speci- 
mens lying in the cave. These were collected by himself, and were in- 
teresting as showing how pseudomorphs of organic forms might be de- 
veloped in caverns. The acid, however, dissolved them completely, and 
no vestige of the organic basis upon which they were molded remained. 
I at first supposed them to be some form of Julus, but could not be cer- 
tain. 
Out of nine related species known to inhabit this country but two are 
blind, the other being the Spirostrephon (Scoterpes) copei Packard, which 
inhabits Mammoth Cave, Kentucky. Another, which, according to Pro- 
fessor Cope, inhabits Wyandotte Cave, Crawford County, Indiana; Er- 
hart’s Cave, Montgomery County ; and Spruce Run and Big Stony Creek 
