PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 415 



but in otlier 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 chelae* are stout, but little more than twice as 

 long as broad, and the basal portion considerably swollen. 



Eupiognatha rastellifera Stimpson, Bull. Mus. Comp. Zoul. Cambridge, li, p. 123^ 

 1870. — A. Milue-Edwarcls, Crust. R^giou Mexicaiue, p. 183, pi. 33, fig. 2, 187d. 



Stations 8G5, 8G9, 871, 872, 873, 874, 877, 878 ; 05 to 192 fathoms ; at 

 nearly all these stations 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 chelce 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 nearly 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 L. Pourtalesii Stimpson. 



Female. — The carapax, including lateral spines, is about one and a 

 fourth times as broad as long, with a broad longitudinal depression 



* I restrict, as Huxloy has done, the term chela to the two terminal segments of a 

 chelate appendage. 



