not deeply immersed in peraeon, hind margin less wide than the 

 slightly arched front, which has a well-marked process between 

 the first antennas. First peraeon segment the longest^ with 

 hinder angles strongly rounded, the front ones squarely produced 

 forward. Hind margins of the first four segments of perseon 

 and first of pleon smooth, the rest tuberculate, almost impercep- 

 tibly on fifth peraeon segm/ent^ on the others successively with 

 greater prominence, the fifth pleon segment having also on each 

 side of the centre a strong tubercle in advance of the hind margin. 

 The telsonic segment carries anteriorly a median carina begin- 

 ning with a small tooth or prominence and ending in a large one, 

 this being followed by two pairs of tubercles, of which the surface 

 has in addition one or two at the base on each side of the carina, 

 and many of various sizes along each margin. The slightly 

 sinuous sides, where free from the uropods, are fringed each with 

 seventeen spines in sets of six and eleven, interspersed with short 

 plumose setae, the narrowly rounded apex having a similar arma- 

 ture of four spines and accompanying setae. ,Of the second and 

 third peraeon segments, the side-plates do noti r'eiach the hind, 

 margin of their respective seg'ments, and in the former case are 

 narrower behind than in front; in the other segnJents the side- 

 plates have the hind margin produced backward, and agreeing 

 as to sculpture with the hind margin of the segment, those of thef 

 seventh overlapping the first two segments of the pleon- The 

 third pleon segment is the widest, and the fourth is wider than 

 the fifth. 



The eyes are dark in formalin, roughly rounded, of moderate 

 size, with numerous small components. 



First antennae — The peduncle is clearly three-jointed, shorter 

 than the flagellum, which has seventeen joints furnished with 

 hyaline filaments. 



Second antennae — The first three joints of the peduncle are 

 short, the fifth is longer than the fourth ; the flagellum, about 

 twice as long as the peduncle, attains to thirty-one joints- 



The frontal lamina surmounting the epistome widens to the 

 convex anterior border, from which it bends to meet the rostra! 

 point with an angular termination. 



The mouth-organs, as will be seen from the figures, are in 

 tolerably close agreement with what is usual in the genus. In 

 the first maxillae attention may be called to the little projecting 

 horn on the outer side of the inner plate. Such a process is 

 figured by Hansen for Cirolaua borcalis Lilljeborg, but not for 

 Cirolana eiongata Milne-Edwards, nor for his own Cirolaua 

 minuta, nor do I find it in Cirolana orientalis Dana, which has \n 

 its place a minute spine, in agreement with Cirolana japonica 

 Hansen; the process is feebly developed in Cirolana pleonastica 

 and Cirolana albican data, which I have recently described- 

 First gnathopods — These are rather robust, the fourth joint 

 fully as broad as long, with two rows of spines along the inner 



