aoe 
1883.] 197 [Packard. 
evenly convex, considerably broader than the head; the three succeeding 
segments are of about the same length, and each are about half as long as 
the fifth and succeeding segments. On the first segment are about ten bead - 
like tubercles seen from above; on the third about eight longer tubercles 
can be seen from above; on the fifth and succeeding segments there are 
about nine dorsal and subdorsal high, prominent, thick, parallel ridges, be- 
coming sharp behind. On the middle segments of the body about six 
sharp ridges with broad hollow valleys between can be seen from above. 
These are mounted on each side lower down by about twelve less distinct 
ridges, becoming towards the lower edge of the scuta less and less convex 
and distinct, until they are indicated by simple impressed lines. There are 
thus about thirty ridges in all on each scute. The segments (arthromeres) 
are short, and the smooth spaces between the rigid portions are very short 
above. The color of the body is horn-brown, the head, feet and antenne 
pale flesh-colored, and there is a dark median spot on the vertex between 
the eyes. The ridges are darker than the rest of the body. Length 80™™, 
Little Wyandotte cave, Indiana ; and Cave of Fountains next to Weyer’s 
cave, Virginia (Packard), Zwingler’s cave, Carter’s cave, Kentucky (F. G. 
Sanborn), Spruce Run cave in the Kanawha river, Giles Co., Va. (Cope). 
One of the most abundant of the Myriopoda in the mountain region of 
Tennessee and North Carolina (Cope). 
This species is not unfrequently found in caverns, where DL. lactarium 
more rarely occurs. This well-marked species may readily be distinguished 
from Lysiopetalum lactarium by the very short, thick antenne, linear eyes, 
and by the slenderer body, which, however, ends much more obtusely. 
We know of but one other species of Julidie with the eyes arranged in a 
linear series ; this is the Trachyjulus ceylonicus Peters of Ceylon, figured 
by Humbert, 
The cave specimens which we have found are partially bleached, the re- 
sult of probably a limited number of generations in the darkness. 
On the Morphology of the Myr seed By A. 8. Packard, Jr. 
(Read before the American Philosophical Society, June 16, 1883 ny 
5 
The following notes have reference to the hard parts especially of the 
diplopod Myriopods : 
The Head. In the Chilognaths, which are the more primitive and in 
Some respects the lowest group of the sub-class, the Pauropoda excepted, 
the structure of the head is on a much simpler type than in the Chilopoda. 
The epicranium constitutes the larger part of the head ; it may be re- 
garded.as the homologue of that of hexapodous insects. Of the clypeus 
of Hexapoda there is apparently no true homologue in Myriopods ; in the 
Lysiopetalid Chilognaths there is, however, an interantennal clypeal re- 
