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Pseudothalestris major YT. and A. Scott, has eight-jointed antennules. Pseudothalestris sarst 
differs distinctly from Sars’ illustrations of Westwoodia minuta in the length of the joints of 
the antennules, and in the shape and armature of the distal joint of the fifth pair of feet. The 
expansion of the proximal joint is also much wider. 
Occurrence. — One specimen was obtained from the surface plankton collected at 
Station 40, off Pulu Kawassang, Paternoster Islands. 
This species is named in compliment to Professor G. O. Sars whose numerous works 
on the Crustacea are of the utmost value to every worker who attempts to study almost 
any order of that extensive class of animals. 
Genus Eudactylopus nov. 
The body is moderately stout in front, and rather slender behind. The anterior division 
is more or less depressed. The cephalic segment is provided with a well developed and very 
motile rostrum. The abdomen of the female is composed of four segments. The antennules 
are short, stout and seven-jointed. The exopodite of the antennae is two-jointed. The mandibles, 
maxillae and maxillipedes are normal and are similar to those of the genus Dactylopusia 
Norman. The exopodite of the first pair of feet is -three-jointed, and is considerably shorter 
than the endopodite. The terminal joint is short and armed with claws. The endopodite is 
two-jointed or very indistinctly three-jointed. The first joint is long. The second joint is very 
short and is armed with a very powerful claw. The exopodite and endopodite of the second, 
third and fourth pairs of feet are three-jointed and are similar to Dactylopusia. The fifth pair 
of feet is large, foliaceous and transparent, and completely covers the ovisac below. 
The type of the genus is Dactylopusza latipes T. Scott (1893). It approaches Dactylo- 
pusia in general appearance, but differs conspiciously in the two-jointed exopodite of the 
antennae, and in the great development of the fifth pair of feet of the female. It differs from 
Dactylopodella Sars (1905), in having the exopodite and endopodite of the second pair of feet 
composed of three joints, and also in the large fifth pair. 
One species at present is known. It was represented in the material collected by the 
‘Siboga’ in the Malay Archipelago. 
1. Ludactylopus latipes (YT. Scott). Plate LXIII, figs. 8—14. 
Dactylopus latipes T. Scott (non Boeck), 1893, p. 99, pl. X, figs. 38—43. 
Dactylopusia latipes Thompson & Scott, 1903, p. 268. 
Female — length 1,4 mm. 
Seen from the side, the body appears moderately robust. The cephalic segment is large 
and exceeds the combined length of the thoracic segments. The rostrum is well developed and 
is very motile. 
The abdomen is composed of four segments. The genital segment is rather large and 
is almost equal to the combined length of the second and third segments. It is marked by a 
‘distinct suture traversing the middle of the dorsal surface. The second and third segments are 
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