PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 415 
but in other respects they all agree well with the figures. In a few of 
the smallest specimens examined the spines are very nearly or quite as 
prominent as in the figures, while in other respects they are indistin- 
guishable from specimens of the same size in which the spines are very 
small and inconspicuous. In all the spineless specimens there is a more 
or less prominent tubercle in place of the spines of the carapax. As in 
the next species, the spines are probably specially characteristic of the 
young, and become more or less obsolete as the individual increases in 
size, the obsolescence being more rapid in some individuals than in 
others. I think there is very little doubt that this species is synonymous 
with C. trispinosus Stimpson, also described from very small specimens. 
The following measurements show the size of the specimens examined. 
In the largest males the chelx* are stout, but little more than twice as 
long as broad, and the basal portion considerably swollen. 
. Length of | Breadth of = 
Station. Sex. carapax. carapax. Ratio. 
mm mm. 
10.0 7.9 1: 0.79 
12.0 8.7 1: 0.73 
14.3 11.0 ORG 
14.7 12.2 Ona 
a VB) 14.0 1: 0.80 
8.2 Ei 1: 0.70 
11.0 8.0 aa) 7/33 
3.1 10.3 1: 0.78 
14.0 11.0 1: 0.78 
Euprognatha rastellifera Stimpson, Bull. Mus. Comp. Zool. Cambridge, ii, p. 123, 
1870.—A. Milne-Edwards, Crust. Région Mexicaine, p. 183, pl. 33, fig. 2, 1878. 
Stations 865, 869, 871, 872, 873, 874, 877, 878; 65 to 192 fathoms; at 
nearly all these angus in vast numbers. 
Many of the specimens are much larger than those described by 
Stimpson and Milne-Edwards, males often being 15°" in length of cara- 
pax. In all the large specimens the spines of the carapax are much less 
conspicuous than in the young; the spines upon the orbital arches, upon 
the gastric, cardiac, and the summits of the branchial regions, and upon 
the basal segment of the abdomen, are often reduced to low and incon- 
spicuous tubercles. In large males the chele are nearly as long as the 
carapax, more than a fourth as broad as long, and the basal portion 
considerably swollen. The whole animal is ee naked and very free 
from foreign growths of all sorts, contrasting strongly in this respect 
with most of the Maioidea. 
Lambrus Verrillii, sp. nov. 
Allied to Z. Pourtalesii Stimpson. 
Female—The carapax, including lateral spines, is about one and a 
fourth times as broad as long, with a broad longitudinal depression 
*T restrict, as Huxley has done, the term chela to the two terminal segments of a 
chelate appendage. 
