80 STALK-EYED CRUSTACEA. 



basul part marginato, 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 

 sjjine 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 diminishing successively in size from the first to the third, which is obsolete 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, pleurae tuberculose, angles rounded. The 

 legs are rough with granular setose tubercles. Thei'e 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 ambulatoiy limbs. The antennce 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 vaiiety in which the anterior lateral 

 spines as well as the median gastric spine are very much smaller than in the 

 typical form. This variety, which I have named Galacaiiiha diomedece, var. 

 panispina, is figured on Plate XXV., Fig. 2. At one Station (3429) both 

 forms were obtained at the same haul. 



G. diomedece diflfers from all other known species of Galacaniha 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 m.ay 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, etc. 



Station 3357. 782 fathoms. 1 fem. juv. 



