CUMACEA FROM THE COPENHAGEN MUSEUM. 35 



outer flagellum is about equal to the second segment of the peduncle and consists of 

 two segments. The unjointed iuner flagellum is equal in length to the first segment 

 of the outer. 



The antennae are composed of three segments. The proximal segment bears two 

 plumose setae. 



The mouth-parts are of the usual Leuconid type. 



The posterior division of the branchial apparatus bears only two small papilliform 

 lobules. 



The first legs extend beyond the pseudorostrum by nearly the length of their two 

 distal segments. The basis is about two-thirds as long as the distal segments 

 together. 



The second legs have the basis shorter than the remaining segments together ; the 

 ischium is represented by a narrow chitinous ring between the basis and merus. 



The uropods have the peduncle longer than the terminal somite and about three 

 times as long as thick. The rami are subequal and a little longer than the peduncle. 

 The exopod is obliquely truncated at the tip, which bears about five unequal sette. 

 The endopod has a strong, dorsally curved, apical spine and about ten spines on its 

 iuner edge. 



Description of adult C?) Male. — Total length 1-65 mm. 



Carapace one-fourth of total length, its vertical height about four-fifths of its length. 

 Dorsal edge slightly arched, smooth, or with one or two small serrations anteriorly. 

 Pseudorostrum very short, horizontal, broadly rounded at the tip. No antennal notch. 

 Antero-lateral angle broadly rounded and serrated. 



Antennules with three segments in outer flagellum. 



Antennae with flagellum very short, not longer than the peduncle, composed of nine 

 segments. It is thickened at the base, where the segments are indistinctly separated, 

 but distally they are slender and well-formed and provided with sensory setae. 



The remaining appendages do not differ greatly from those of the female. 



The peduncle of the uropods is little more than half the length of the rami. 



Beviarks. — Though there can be little doubt that the males described above belong 

 to the same species as the females, their much smaller size is very suggestive of 

 immaturity, and to this cause may be due the remarkable shortness of the antennae. 

 The antennae, however, do not show the usual characters of immaturity, for the 

 peduncle is beset with sensory filaments, and the flagellum, tliough short, is distinctly 

 segmented and carries setae. 



Occurrence. — " Akaroa Harbour, 6 fathoms, H. Suter Coll., 8/97 " : many females 

 and three males. " Lyttleton Harbour, 1-5 fathoms, H. Suter Coll., 8/97 " : many 

 females. Copenhagen Museum. Co-types in British Museum. 



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