242 "TERRA NOVA" EXPEDITION. 



with one or two blunt spines on the hind margin of the second joint, the outer and 

 hinder corner of the fourth joint spiniform, a row of small spines on the inner front 

 margins of the third, fourth, fifth and sixth joints, and a small claw at the tip of the 

 seventh joint. There are four pairs of incubatory lamellae in the female, and the 

 exopod of the first pleopods of the male is modified in the way I have described for the 

 genus as a whole. 



This species is most nearly allied to A. coppingeri, Miers, and A. aiitarcticus, 

 Bouvier. It is distinguished from both these species by its smaller size, by the 

 presence of two distinct though small cephalic horns, and by the greatly reduced 

 length of the terminal spines of the abdomen. 



47. Antarcturus horridus, sp. no v. PI. IX, fig. 2. 



Occurrence. — Station 314, 5 miles N. of Inaccessible Island, McMurdo Sound, 

 222-241 fathoms, bottom fauna, two males, 18 mm. (types). 



Station 355, 77° 46' S., 166° 8' E., 300 fathoms, bottom fauna, one male, 16 rnm. 



Description. — This species is best described by a reference to pi. IX, fig. 2. 

 It is a very spinous species, and it is difficult to describe the arrangement of the spines. 

 The most prominent feature is the pair of large upright forwardly directed cephalic 

 herns between the eyes, each of these borns bearing several secondary spines and 

 spinules. There is a prominent spine on each of the side-plates of the segments, and 

 in general a row of larger spines on the dorsal surface of each segment ; but the great 

 profusion of secondary spinules obscures the main arrangement. The pair of processes 

 at the posterior end of tbe abdomen are rather short, but like the cephalic horns they 

 bear secondary spines and spinules. 



The first antennae are rather long, almost reaching the end of the third joint of 

 the peduncles of the second antennae. The first joint of the peduncle has a spine 

 on the anterior dorsal margin. The second joint is longer than the third, and the 

 flagellum is equal to the second and third peduncular joints combined. 



The second antennae are longer than the body, the third joint of the peduncle 

 nearly three times as long as tbe second, the fourth joint twice as long as the third but 

 considerably less stout, the fifth joint very long and slender, more than one and a half 

 times as long as the fourth ; flagellum broken in all the specimens, but composed of 

 more than eight rather long and slender joints. The first four joints of the peduncle 

 are very spinous, but the fifth joint is without spines. The general arrangement of 

 the spines can be seen in the figure. 



The thoracic limbs are rather long and slender and very spinous, but they are 

 quite typical of the genus, and the figure shows the essential details of their form and 

 armature. 



Remarks. — This species may be distinguished from all other described species of 

 the genus by the great development of the spines arming the body, by the large pair 



