100 
THE VOYAGE OF H.M.S. CHALLENGER. 
West- American Species. 
Lambrus excavatus, Stimpson. Mexico ; Manzanillo. 
Lambrus triangulus, Stimpson. Cape St. Lucas. 
Lambrus frons-acutis, Lockington. California (Simaloa, Santa Catalina ). 1 
Lambrus ( Parthenolambrus ) massena, Roux. 
Lambrus massena, Roux, Crust, de la Mediterranee, pi. xxiii., 1830. 
„ „ Milne Edwards, Hist. Nat. Crust., vol. i. p. 356, 1834. 
„ „ Lucas, Animaux Articulds in Explor. Scientif. de l’Algerie, vol. L (Crust.), 
p. 10, pL i. fig. 3 $ , 1849. 
1 Lambrus rugosus, Stimpson, Proc. Acad. Nat. Sci. Pliilad., p. 220, 1857. 
Lambrus ( Parthenopoid.es ) massena , Miers, Ann. and Mag. Nat. Hist., ser. 5, vol. viii. p. 207, 
1881. 
A male and a female of what I have regarded (in the absence of types for comparison) 
as the typical form of this variable species were collected — the male at St. Vincent, Cape 
Verde Islands, in July 1873, the female at the Azores, off Fayal, in 50 to 90 fathoms. 
c? . Lines. Millims. 
Length and breadth of carapace and rostrum, . . . 3| 7 - 5 
Length of a chelipede, . . . . . . 5J 11'5 
Length of first ambulatory leg, about .... 4 9 
Lambrus massena , Roux, var. atlanticus, Miers. 
Lambrus massena , var. atlanticus, Miers, tom. cit., p. 208, 1881. 
St. Vincent, Cape Verde Islands (with the typical form) two males. The dimensions 
of the larger, which has lost nearly all the ambulatory legs are as follows : — 
<? . Lines. Millims. 
Length and breadth of carapace and rostrum, . . . . 4 8 - 5 
Length of a chelipede, nearly . . . . . . 6 12 - 5 
Lambrus ( Parthenolambrus ) expansus, Miers. 
Lambrus ( Parthenopoides ) expansus, Miers, Ann. and Mag. Nat. Hist., ser. 5, vol. iv. p. 25, pi. v. 
fig. 9, 1879. 
Azores, off Fayal, in 50 to 90 fathoms. Two males and a female were collected. 
The colour (even in the spirit-preserved specimens) varies considerably ; the 
ground-colour in all three specimens is a light pinkish-yellow, with slaty- coloured 
markings on the chelipedes. In the smaller male the carapace is covered with similar 
1 M. A. Milne Edwards has recently described two species of Lambrus from Upolu, one of the Samoan Islands, 
which I cannot with certainty refer to any one section of this genus ; they are Lambrus gracilipes, A. Milne Edwards, 
and Lambrus pugilator, A. Milne Edwards ; the latter is perhaps a species of Aulacolambrus. 
