1 80 [June 16, 
Packard.) 
line, but one situated on the boss, which is smaller than usual; the upper 
most tubercle is very near the median line of the body. The sete are 
straight and stiff, pointing upward and either forward or backward, and 
are longest in Scoterpes, and shortest in Oryptotrichus where they are min- 
ute and about one-fourth as Jong as the body is thick. Below and behind 
the lateral boss, the surface is sometimes chased with nearly parallel oblique 
lines, or, as in Cryptotrichus, the depressed hinder edge of the scutes is 
finely striated longitudinally. The end of the body is usually much more 
acutely pointed than in the Julide. 
Having received, through the kindness of Dr. Latzel, specimens of Ly- 
siopetalum carinatum Brandt, from Dalmatia, which is a very large species, 
T have been able to examine the repugnatorial pores, which are very dis- 
tinct, their crateriform openings being situated each between two ridges 
on the anterior edge of the raised portion of the scute, In L, illyricum 
Latzel, from Austria, they are with difficulty perceived, the area in which 
they are situated not being discolored with yellow ; but they can be de- 
tected with a half-inch objective. The two European species mentioned 
are provided with sete, while our L. lactariwm is naked. In the latter 
species the repugnatorial pores are situated in the middle of the yellow 
lateral spot, between two carine, which are higher and closer together 
than any of the others, They can be seen with a Tolles triplet. 
Examining the cave Lysiopetalid, Pscudotremia cavernarum Cope, from 
Wyandotte cave, anda variety, carterensis, which inhabits the Carter caves, 
Ky., I cannot with certainty discover their site, as they are nearly, if not 
quite, obsolete. It is possible that in cave species, where there are appar- 
ently no enemies of these myriopods, their pores become at least exter- 
nally obsolete. 
The Legs. The number of joints of the legs in general is six ; the second 
and third, especially the third, being the longest (this inequality in the 
length of the joints is an important family character); the fourth and fifth 
joints are very short, about equal in length, while the sixth and last joint 
is long and slender, ending in a slender claw. 
Of the three pairs of primary or larval legs, the first pair are variously 
modified in different genera. In Lysiopetalum lactarius the first legs are 
rather flat and short; the third joint from the claw nearly thrice as long 
as the second, while the terminal joint is broad, with a series of close-set, 
stiff setee of nearly equal length, but increasing gradually in length dis- 
tally ; the joint is evidently a comb-like structure adapted for cleaning the 
body, perhaps the mouth-parts. The first pair of legs in Pseudotremia 
are much longer and slenderer than in Lysiopetalum, six-jointed, and the 
terminal joint is less comb-like, both edges being densely setose, the inner 
edge, however, having the stoutest, most regular setee. 
The sixth pair of legs in Zygonopus are modified for clasping purposes, 
the fourth and fifth joints being much swollen, as described in the descrip- 
re 
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