OF THK ' SOUTHERN CEOSS ' EXPEDITION. 47 



Lower autennae a little longer than the upper, the 2nd joint 

 of the peduncle the longest. 



Maxillipedes : the outer plate reaching to the middle of the 

 3rd joint of the palp, and having apparently a double edge ; 

 inner plate toothed at the apex, the innermost tooth the largest. 



First gnathopods : 1st joint almost as long as the remaining 

 joints. Eront margin of the carpus y^ths of the same in the 

 propodos ; this has parallel margins and is rectangularly truncate ; 

 dactylus short, strong, and curved. Side-plates tapering and 

 rounded distally. 



Second guathopod with the posterior margin of the propodos 

 acutely produced ; side-plates subrectangular, rather the widest 

 near the middle. 



Eirst and second perseopods longer than the rest. Third pair 

 short, the 1st joint greatly expanded behind, the 3rd joint 

 expanded and produced downwards : the side-plate more than 

 twice as large as the 1st joint, deeper than wide. Pourth and fifth 

 pairs with the 1st joint less expanded and subequal in length. 

 The 1st joint in the last three pairs is indistinctly crenulate ; the 

 2nd and 3rd joints have a few long setae and short spines on the 

 front margin. 



Third uropods have the peduncle slightly longer than the 

 outer ramus, which is longer than the inner by the terminal nail. 

 The outer ramus has 6 or 7 long setae on the inner side ; the 

 inner has several slighter setae on the inner, and 2 or 3 spines 

 on the distal half of the outer side. 



Telson as long as the peduncle of the 3rd uropods, concave 

 above, and divided rather more than one-third of its length ; a 

 small spine at the tip of each division. 



Length 7 mm. 



Very near Orchonienella pinguu (Boeck) from the Siberian 

 Polar Sea (Stuxberg). 



O. Peanklini, n. sp. (PI. 8. figs. 31-36.) 

 Pranldin Island, 10-24 fath., Feb. 9, 1900. One female. 

 Body very tumid. Pirst three segments severally rather 

 shorter than the next four. Pirst 4 side-plates much deejjer 

 than the segments. Posterior angle of the 3rd metasome-segment 

 hluntly rectangular ; the liind and lower margins almost straight. 

 Urosome rather longer than the 3rd metasome-segment, the 1st 

 segment without carina or depression, and longer than the next 



