211 
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 
Geiates LXV figs 20): j 
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, fig. 28). 
The shape of the fifth pair of feet, and the presence of a tooth-like 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. Altenthella pygmaca nov. sp. Plate LXVII, 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 tooth-like process 
(Glate XVII, 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 Adteuthella 
pellucida. The second pair of maxillipedes is rather slender. The second joint is moderately 
long and narrow. The terminal claw is short and curved. It is much shorter than the second 
joe (Plate XVIl, fig: 3). 
The first four pairs of feet are similar to those of Adteuthella 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 trace 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 tooth-like 
spine. The proximal portion of the inner margin is distinctly indented and is provided with 
two setae (Plate LXVII, fig. 5). - 
