210 "TERRA NOVA" EXPEDITION. 



with a few setse, one of which is moderately robust and as long as the whole 

 flagellum. 



Antennae in the male about three-fourths of the total length of the body, 

 reaching the second abdominal somite ; in the female slightly sjiorter, only three- 

 fifths of the total length, and extending barely beyond the penultimate thoracic 

 somite; third joint of the peduncle (pi. Ill, fig. 11) approximately half as long as 

 the fourth ; flagellum of 22-24 joints terminated by a long robust seta. 



Coxal plates of the second, third and fourth free thoracic somites not produced 

 at all ; those of the fifth, sixth and seventh produced into distinct processes ; those of 

 the sixth segment much longer than those of the fifth or seventh somites. The 

 coxal plates are almost exactly similar to those of E. truncata, Norman. 



Eighth thoracic legs (pi. Ill, fig. 13) moderately robust; fourth joint only very 

 slightly longer than broad, shorter than the fifth joint ; fourth, fifth and sixth 

 joints with two or three groups of spines on both the upper and lower margins, 

 mingled with long setae. 



Last abdominal somite (pi. Ill, fig. 17) with the posterior margin about one- 

 third as long as the breadth of the somite, almost straight and finely serrate, 

 without movable spines, at each end furnished with a prominent tooth, outside 

 which is a smaller tooth ; some of the serrations between the external prominent 

 teeth larger than the rest, the margin furnished with small setae between the 

 serrations. 



Eami of the uropods (pi. Ill, fig. 15) each furnished at their outer distal angles 

 with two or three conspicuous spines among the long plumose setae fringing their 

 margins. 



Appendix masculina on the second pleopod of the male (pi. Ill, fig. 14) longer 

 than the rami ; its apex abruptly narrowed and almost spiniform. 



The colour of preserved specimens indicates that in life the species is mottled or 

 marbled brown, with a profuse system of black chromatophores. 



Length of an adult male, 5 mm. ; of an adult female, 7 mm. 



Remarks. — This new species is very closely allied to Eurydice truncata, 

 Norman, a pelagic species of similar habits known from the Atlantic Ocean and 

 the Mediterranean. The main differences are to be found in the length of the antennules 

 and antennae, in the absence of marked sexual difterences in the antennules, in 

 the robuster and rather more spiny nature of the posterior thoracic legs, and in 

 the shape of the appendix masculina of the second pleopods of the male. In such 

 fundamental structures as the clypeus, the form and shape of the coxae of the 

 thoracic segments, and the shape and armature of the last abdominal segment, the 

 species are hardly distinguishable. It should be remarked that Stebbing (1910) has 

 recorded E. truncata from the Indian Ocean, near the Seychelles, thus indicating a much 

 extended geographical distribution. The present form is so close to E. truncata that 

 it may perhaps be more properly regarded as a local race. 



