220 



of nearly equal length. The anal segment is comparatively short. The furcal joints are as long- 

 as broad, and are equal to two-thirds of the length of the anal segment. 



The antennules are short and seven-jointed. The fifth and sixth joints are shorter than 

 the others. In some positions the seventh joint shews an indication of a sub-division, but this- 

 is due to the setae becoming folded over the surface of the joint in the preparation of the 

 mount. The distal end of the fourth joint is furnished with a sensory filament (Plate LXIII, fig. 9). 



The antennae are similar to those of Dactylopusia, but the exopodite is distinctly two- 

 jointed (Plate LXIII, fig. 10). 



The mandibles, maxillae and maxillipedes are similar to those of Dactylopusia. The 

 second joint of the second pair of maxillipedes is long and moderately robust. The upper 

 margin is fringed with short spines. The terminal claw is long and stout, and is nearly as 

 long as the second joint (Plate LXIII, fig. 1 1). 



The first pair of feet is comparatively short and stout. The exopodite is three-jointed. 

 The last joint is short and is furnished with three claws and one seta. The endopodite is 

 two-jointed. The first joint is longer than the exopodite. The second joint is short. It is armed 

 with one large stout claw, one small claw, ancl a short seta (Plate LXIII, fig. 12). 



The exopodites and endopodites of the second, third and fourth pairs of feet are three- 

 jointed as in the genus Dactylopusia. 



The fifth pair of feet is two-jointed and extends to the middle of the second abdominal 

 segment. The joints are very large and foliaceous. The proximal joint is broadly wedge-shaped. 

 The distal joint is sub-quadrangular in outline. The margin of the joints is fringed with short 

 hairs. A few short feeble setae are also present (Plate LXIII, fig. 13). 



Male unknown. 



Eudactylopus latipes is readily recognised by the two-jointed exopodite of the antennae, 

 by the structure of the first pair of feet, and by the very large foliaceous and transparent 

 fifth pair of feet. 



This species was described in the report 'On Entomostraca from the Gulf of Guinea' 

 by my father from a single specimen. It has also been recorded from the Island of Ceylon by 

 Thompson and A. Scott. Sars points out in 'Crustacea of Norway' Vol. V, p. 131, that 

 Dactylopus latipes Boeck is identical with Dactylopusia brevicornis (Claus), but is quite distinct 

 from Dactylopus latipes T. Scott. 



Occurrence. — Two specimens were obtained from the washings from dredged 

 invertebrata collected at Station 273, off Pulu Jedan, East Coast of Aru Islands, at a depth 

 of 1 3 metres. 



30. Family Diosaccidae. 

 Genus Amphiascus G. O. Sars, 1905 (c). 



Sars points out in 'Crustacea of Norway' Vol. V, that many of the species placed under 

 the genus long known as Dactylopus ought properly to be included under this genus. 



