80 STALK-EYED CRUSTACEA. 
basal part marginate, the margin running for some distance along the an- 
terior edge of the carapace ; a slight keel runs back from the rostrum to 
the median gastric spine. Gastric spine smaller than in G. rostrata ; anterior 
lateral spine much longer than the posterior; there is an additional small 
spine on each side of the carapace just behind the anterior branchial lobe. 
Anterior half of the carapace ornamented with setiferous squamous tuber- 
cles; on the posterior half of the carapace the tubercles assume the form of 
interrupted transverse ridges. The median spines of the abdomen are small, 
diminishing successively in size from the first to the third, which is obsolete 
in many examples. Upper surface of abdomen rather hairy, the transverse 
ridges devoid of teeth or tubercles, pleuree tuberculose, angles rounded. The 
legs are rough with granular setose tubercles. There are two prominent 
spines at the distal end of the carpus of the chelipeds, and one at the distal 
end of the carpus and merus of the ambulatory limbs. The antenne are 
twice and a half as long as the body. 
Dimensions of a female specimen: length of body, 79 mm.; length of 
carapace, 39 mm.; breadth of carapace, not including the lateral spines, 
25 mm. 
This species runs into a well-marked variety in which the anterior lateral 
spines as well as the median gastric spme are very much smaller than in the 
typical form. This variety, which I have named Galacantha diomedec, vay. 
parvispina, is figured on Plate XXV., Fig. 2. At one Station (3429) both 
forms were obtained at the same haul. 
G. diomedee differs from all other known species of G'alacantha by the 
rugose character of the sculpture on the hinder half of the carapace. In 
the relative proportion of the anterior and posterior lateral spines it agrees 
with G. spinosa. It may be easily distinguished from G. spinosa by the 
entirely different sculpture of the carapace, by the absence of transverse 
rows of tubercles on the abdominal terga, ete. 
Station 8357. 782 fathoms. 1 fem. juv. 
Ee OOOO (G.ree te 3 males, 3 fem. ovig. 
Cc OOS ao Qe a nce 1 fem. 
ce 3500.8 LOGm. 3 males, 1 fem. ovig. 
Ce SSDI Ue sae 5 males, 2 fem. (1 ovig.). 
ice - Saou Omni 1 male. 
C3503, LOZ0e a6 3 males. 
Te ay: AU iGm retold ioe you 2 males, 1 fem. 
