654 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Crustacea. 



few poorly developed transverse folds on the inner part near the base, so that at 

 first I thought it was a species of Exosphaeroma, and began to describe it as such. 

 Except for the sexual differences and the lack of emargination in the terminal seg- 

 ment, it seems to come pretty close to Dynamenella. Monsieur E. G. Kacovitza* 

 has recently described a genus Ischyromene which seems to be somewhat nearly re- 

 lated, and also shows sexual differences, but these are of a different character to 

 those found in the genus now under discussion. 



The type species is P. campbellensis, described below. 



Pseudosphaeroma campbellensis, sp. nov. 



Male. — Body fairly convex, widening a little posteriorly ; head with the front 

 depressed, vertex bounded in the front by a slight ridge and produced a little between 

 the bases of the upper antennae, surface of head slightly uneven. 



First three segments of peraeon subequal, a little longer than the fourth, which 

 is longer than any of the following three segments, the surface of all nearly smooth, 

 but with some slight granulations, specially towards the sides and on the last three 

 segments. 



First portion of the pleon with two sutures at the sides, and bearing near the 

 centre two small rounded tubercles. The second division of the pleon with two well- 

 marked tubercles in the centre near the anterior margin, each tubercle being bifid 

 at its extremity ; the segment is produced posteriorly, with the posterior border 

 broadly truncate, with rounded angles and hinder portion usually sharply upturned, 

 but in some cases nearly horizontal ; whole surface of the pleon finely granular. 



The eyes rather small, subtriangular, occupying the postero -lateral angles of the 

 head. First antenna with the first joint large and broad, with indentation on pos- 

 terior margin, second joint nearly as broad but much shorter, the third much longer 

 than second but much narrower, flagellum consisting of about eight joints, which bear 

 only a few setae. Second antenna longer than the first, last two joints of peduncle 

 subequal and longer than the preceding one, flagellum containing about eleven 

 joints. 



First pair of legs shorter than the succeeding pairs, the carpus being shorter 

 than the ischium and subtriangluar in outline, a few fine woolly setae on the inner 

 surface of the merus, and larger setae on the ischium, carpus, and propod ; the suc- 

 ceeding pairs of legs rather longer, increasing slightly in length posteriorly, with the 

 carpus nearly as long as the merus, and the inner surface of the merus, carpus, and 

 propod thickly fringed with short woolly setae ; longer setae on the other joints, 

 as shown in figure. 



The uropods with the inner branch reaching almost or quite to the end of the 

 terminal segment, outer branch slightly shorter, both oval, with the extremities 

 rounded. 



Female. — With the posterior segment of the pleon less produced and only slightly 

 upturned, and without the tubercles on the dorsal surface. The immature males 

 resemble the females in these points, but may have the tubercles on pleon partially 

 developed. 



* " Archives de Zoologie experimentale et generale " [4], ix, notes et revue No. 3, p. Ix, figs. 1 to 3, 

 1908. 



