21 I 



and broad. The spine on the outer angle of the apex of the joints is stouter than in the 

 female, and the base of the principal seta on the inner portion is not thickened very greatly 

 (Plate LXVI, fig. 29). 



The fifth pair of feet is rather smaller than that of the female, but the shape is almost 

 the same. The inner apical spine is very short (Plate LXVI, tig. 28). 



The shape of the fifth pair of feet, and the presence of a toothdike spine on the outer 

 angle of the apex of the furcal joints readily distinguish this species from any of the other 

 members of the genus. 



Occurrence. — One female and one male were found in the washings from dredged 

 invertebrata collected at Station 226, from a depth of 1595 metres. 



3. Alteuthella pygmaea nov. sp. Plate LX VII, figs. 1 — 5. 



Female — length .56 mm. 



Seen from above, the body appears moderately wide and is considerably depressed. It 

 is oblong ovate in outline. The greatest width is at the distal end of the cephalic segment 

 and is equal to rather more than half the length of the entire animal. The distal ends are 

 bluntly rounded. The distal ends of the first three thoracic segments are produced into distinct 

 points. The rostrum is very prominent. The frontal margin is rather broad and truncate (Plate 

 LXVII, fig. 1). 



The abdomen is composed of four segments. The genital segment is large and is 

 sub-quadrangular in shape. It it marked by a distinct suture traversing the middle of the dorsal 

 surface. The distal end is slightly contracted and the lateral margins are produced posteriorly 

 into distinct points. The second, third and fourth segments are very. short. The furcal joints are 

 short and wide. The apex of the joints is produced internally into a distinct toothdike process 

 (Plate LXVII, fig. 1 A). 



The antennules are moderately stout and seven-jointed. The last joints are narrower 

 and shorter than the others. 



The antennae, mandibles, maxillae and maxillipedes are similar to those of Altetitliella 

 pellucida. The second pair of maxillipedes is rather slender. The second joint is moderately 

 lons: and narrow. The terminal claw is short and curved. It is much shorter than the second 

 joint (Plate LXVII, fig. 3). 



The first four pairs of feet are similar to those of Alteuthella pellucida. The third 

 joint of the exopodite of the first pair is very short and is furnished with a single curved 

 claw. The endopodite of this pair is much shorter than the exopodite and the inner margin 

 of the first joint has no seta (Plate LXVII, fig. 4). 



The fifth pair of feet is moderately wide at the base and contracts to a narrow apex. 

 There is no tracé of segmentation to indicate a proximal and distal joint. The outer margin 

 is furnished with four short setae. The narrow apex bears two setae and one small toothdike 

 spine. The proximal portion of the inner margin is distinctly indented and is provided with 

 two setae (Plate LXVII, fig. 5). 



