450 PEOF. C. CHILTON ON DETO, A SUBANTARCTIC 



Specific description. — Male. Body oblong-oval ; cephalon with front not 

 much produced in centre ; lateral lobes large with outline subquadrangular, 

 their surface fairly smooth^ rest of dorsal surface of head irregularly tuber- 

 culate. First segment of perseon much wider than the cephalon, posterior 

 margin straight with lateral angles broadly rounded, central portion with 

 two transverse rows of tubercles, lateral portions expanded and swollen 

 into two balloon-like bodies with outer margin convex and surface very 

 finely spinulose. Second, third, and fourth segments with posterior margins 

 straight or only slightly sinuous at the sides, lateral angles slightly pro- 

 duced ; fifth, sixth, and seventh with posterior margins concave, and lateral 

 angles more or less acutely produced. All the segments with the central 

 parts bearing two transverse rows of irregular tubercles, some of them, 

 especially the lateral ones, pointed at apex ; on the epimera is a single row of 

 tubercles or a raised ridge running obliquely outwards and backwards to the 

 postero-lateral angle. 



Third, fourth_, and fifth segments of pleon with large epimera, and a single 

 row of tubercles on central portion. Telson short, much broader than long, 

 triangular, apex broadly rounded, sides a little concave. 



Antennae stout, nearly half as long as body ; first three joints short, 

 subequal, fourth nearly twice as long as third and about twice as long as 

 broad, fifth considerably longer than fourth, narrowed at base ; fiagellum 

 as long as fourth joint, first three segments subequal, fourth smaller but of 

 moderate size ; whole antenna densely hirsute, especially towards the end. 



Uropoda with base broad, flattened, the two meeting in median line, 

 dorsal surface with a slight longitudinal ridge down the centre, outer 

 margin thin, produced, postero-lateral angle acute, produced ; inner ramus 

 inserted much anterior to outer, outer arising from a concavity at end of base, 

 both reaching to same point ; endopod with a few fairly long setae at end, 

 short setae on other parts and on the exopod. 



Female. — Difi'ers from male in lacking the large balloon-like expansions 

 of the first segment of the perseon, and in having the tubercles on the 

 dorsal surface of the body much less developed and the antenna3 more 

 slender. 



Length of male specimen 11 mm.; breadth 5 mm. ; female rather smaller. 



Colour. Slaty grey. 



Bahitat. Chatham Islands (Miss S. D. SJiand) and Stewart Island 

 (Mr. Walter Traill S)- Prof. Benliam), New Zealand ; Valparaiso Bay, 

 South America (Nicolet\ 



I first recognised this species from specimens, unfortunately poorly 

 preserved, sent to me from the Chatham Islands by Miss S. D. Shand ; 

 one female was taken at Port Pegasus, Stewart Island, during the Philo- 

 sophical Institute of Canterbury's Expedition to the Subantarctic Islands of 



