208 'TERRA NOVA" EXPEDITION. 



the thoracic somites increase gradually in size backwards ; each has a deep oblique 

 furrow besides the sub-marginal one. 



Telson (pi. Ill, fig. 8) broadly triangular, wider than long, with bluntly rounded 

 apex armed with six spines and numerous short plumose setae. The dorsal, surface has 

 a median, shallow, longitudinal groove or sulcus, narrowing anteriorly. 



Frontal plate (pi. Ill, fig. 7) small, pentagonal, about one and a half times as 

 long as broad, its front end acute and not visible from above. Clypeus without anterior 

 process, its surface slightly convex, with a furrow along each lateral margin. 



Antennules (pi. Ill, fig. 2) about as4ong as the head ; flagellum with about six joints- 

 Antennae (pi. Ill, fig. 3) reaching almost to the posterior margin of the third free 

 thoracic somite ; flagellum with about fourteen joints. 



Second thoracic legs (pi. Ill, fig. 4) with the third and fourth joints produced ; 

 third joint with one, and fourth joint with five blunt spines on the inner margin. 

 Third and fourth thoracic limbs with the third and fourth joints produced at their 

 outer distal corners. 



The remaining thoracic limbs slender, without natatory setae; last pair (pi. Ill, fig. 5) 

 with the second joint not expanded, nearly three times as long as broad ; fourth joint a 

 little shorter than the fifth, which is somewhat shorter than the sixth. 



Male stylet on the second pleopod (pi. Ill, fig. 6) longer than the rami, slightly 

 curved, but not nearly so acutely pointed as in some other species belonging to this 

 section of the genus. 



Uropods (pi. Ill, fig. 8) with the endopods nearly twice as long as broad, 

 extending some way beyond the apex of the telson, inner margin with three spines, 

 outer margin with four spines, apex sub-bifid with a tuft of long setae, longer than 

 the other setae fringing the margins ; exopods shorter than the endopods, three times 

 as long as broad, inner margin with two spines, outer with four, apex bifid with a 

 tuft of long setae. 



Length of the largest female, 9 mm. ; of the largest male, 5 " 5 mm. 



Of all the species of Cirolana belonging to the second section of the genus, this 

 species approaches most closely to C. sulcata, Hansen. It differs, however, in the 

 absence of tubercles on the somites of the abdomen, and in the shorter and broader 

 form of the telson. The impressed lines on the somites of the thorax are also 

 distinguishing characters, and I cannot find a similar arrangement figured in any other 

 species. Hansen shows a single line across the dorsal surface of the last four thoracic 

 somites of C. sulcata, and that is the nearest approach I can find to the condition 

 I have represented in the present species. 



15. Cirolana japonica, Hansen. PI. II, figs. 11-16. 

 C.japonica, Hansen, 1890, p. 3-1:9, pi. IV, figs. 2-21. 



Occurrence.— Stations 77 , 89, 92, 107, 109, 110, 111, 122, 128, 129, 130, 139, 

 141 and 142, in the neighbourhood of Three Kings Island, between 34° 4'-34° 58' S., 



