1912] Chilopods and Diplopods 171 
Anal scale with anterior margin incurved mesally and convex 
laterally, bow-shaped; each caudo-lateral margin convex, meeting its 
fellow of opposite side in a rounded obtuse angle. Scale crossed with 
a sulcus ending in the cephalo lateral corners and bending caudad across 
the plate; a weaker sulcus sub-parallel with this further cephalad ; 
caudad of the first or principal sulcus and extending to caudad margin 
there is on each side of middle a longitudinal sulcus. Just ectad of the 
longitudinal sulcus on each side and nearly on the caudal margin is 
a double bristle. 
In the gonopods of the male the two rami on each side are fused 
excepting distally, the ventral one not separate and opposed to the 
other like a thumb as is the case in F. dissecta Wood. The principal 
or ventral ramus long and cylindrical, terminating in three spines 
which are inserted at the same level. Spines simply curved, not twisted; 
the ventral one flat, narrow, apically rounded; the outer one dostally 
bent ecto-caudad, pointed; the dorsal one most slender. (See Pl. X, 
figs. 1 and 2). 
Length ad 28 mm.; width 5 mm. 
Locality: Region of Monterey Bay, Cal. (Pacific Grove,etc.) 
A very common species in this locality (Author coll., 1902, 
1909, 1911). 
Related to X. dissecta (Wood) but the gonopods very distinct. 
Xystocheir obtusa Cook and Fontaria furcifer Karsch are 
doubtless synonyms of Wood’s species. I have specimens of 
dissecta from near the type locality and find them to agree 
with Wood’s description as well as with those of the two authors 
mentioned, when Woods’ description is correctly apprehended. 
The nineteenth segment is somewhat variable in length, its 
distal processes occasionally extending considerably beyond 
those of the eighteenth, while in other cases the segment may 
be wholly covered by the eighteenth in which case the latter 
might be readily mistaken for the former. 
