REPORT ON THE CUMACEA. 59 



to tlie middle, the posterior part being slightly narrowed. The surface of the carapace 

 is rather evenly vaulted, without any keels or folds, but armed all over with numerous 

 spines, pointing for the most part anteriorly. These spines are all of nearly equal size 

 and, as in the preceding species, also continued along the lateral parts of the pseudorostral 

 projection. The eye seems to be cpite wanting, and the ocular lobe is rather small 

 and depressed. 



The exposed part of the trunk is considerably narrower than the carapace, and 

 quite smooth ; the epimeral plates are evenly rounded and likewise unarmed. 



The tail is very narrow, and armed with scattered spines both laterally and dorsally. 

 The first segment has a strongly serrate keel running along the ventral surface, and 

 moreover exhibits dorsally, as do also the two succeeding segments, two somewhat 

 stronger spines arranged in pairs, and four ciliated setae issuing from the posterior edge. 



The antennulae (fig. 11) are rather slender, with the basal joint of moderate length, 

 and armed with a longitudinal row of strong spines running along the lower side towards 

 the inner corner, to which a strong ciliated seta is aflixed ; the inner edge of this joint 

 is minutely denticulate in the anterior part, but wants the usual unciliated bristle at the 

 end. The second joint of the peduncle is very slender and almost as long as the basal, 

 whereas the third joint is much smaller. The flagella exhibit the usual structure. 



The antennte (figs. 12, 13) present at fii'st sight a structure rather difi"erent from 

 that in other species, the joints being twisted in a peculiar manner so as only with 

 dilficulty to be counted . Moreover, the structure and arrangement of the setse are rather 

 anomalous. Thus, the two outer setae have assumed the character of strongly chitinous 

 filaments curved in a peculiar manner, and quite devoid of cilia, whereas the six other 

 setse are densely ciliated and crowded together in the middle part of the antenna, all 

 but one apparently issuing from a single joint (the second). 



The first pair- of legs (see fig. 9) are of very considerable length, exceeding, when 

 fully extended, half the length of the body. The basal joint is strongly spinous and 

 densely sup^^lied with ciliated setse. The carpal and propodal joints are exceedingly 

 slender and elongate, and about equal in size, whereas the terminal is much shorter. 



The second pair of legs have the carpal joint very slender and nearly twice as long 

 as the two last joints taken together. 



The two succeeding paii's of legs are rather powerfully developed, about equal in 

 length, and with the meral joint unusually large, and more than twice as long as the 

 carpal joint. 



The last pair of legs are much smaller and of the usual structure. 



The telson (fig. 14) is rather large, about as long as the two last caudal segments 

 taken together, and exhibits in the greater part of its length a regularly cylindrical 

 form, the posterior third part only projecting beyond the anal orifice, and constituting 

 the terminal division. The latter is somewhat flattened and regularly tapering towards 



