Mysidacea, Tanaidacea and Isopoda. 
415 
Order TANAIDACEA. 
Fam APSEUDIDAE. 
Genus Apseudes, Leach. 
Apseudes sp. 
Locality: — \ mi. off shore a httle south of the mouth of the Patalung River, 2 
metres, Tale Sap, 14. i. 16, one specimen. 
This specimen belongs almost certainly to a new species but, in the imperfect 
state of the specimen owing to the breaking oft" of the uropods, it is inadvisable to 
give it a name. 
It belongs to that group of the genus, of which Apseudes talpa Mont., is the type, 
which is characterised by the presence of eyes, the absence of a spiniform rostral 
projection and the presence of a prominent spine on the labrum. 
In the present specimen, the rostral plate is in the form of a low triangle with 
an obtusely rounded apex, the height of the triangle less than one-third of the basal 
distance between the eye lobes. The latter are well developed and the visual elements 
consist of five scattered groups of about six or .seven ocelli each, with intervals between 
them devoid of ocelli or pigment. 
There are no ventral spines on the body nor any prominent spine on the antero- 
lateral corners of the first free thoracic segment. 
The outstanding feature of the specimen is the slenderness of the chelate leg. 
The carpus is about four times as long as broad, longer than the propodus, of 
approximately equal width throughout and without any prominent spines. The 
hand is long and slender and not swollen, while the finger is about one-half the length 
of the hand. The limb has no distinctive armature. 
The third thoracic limb has one stout spine on the merus, two on the carpus and 
two on the propodus, hidden among the longer setae arming these limbs. The 
specimen measures 4 mm. in total length. 
From information sent with the collection, this specimen was collected in 
absolutely fresh water in the inner lake of the Tale Sap. I do not know of any 
previous record of this essentially marine genus from practically fresh water. 
" The water at the point at which this specimen was obtained is, almost certainly, 
always quite fresh, though it is aft'ected to a slight extent by the tides, at any 
rate at times. N . A." 
Order ISOPODA. 
Sub-order ASELLOTA. 
Fam. ASELLIDAE. 
Genus Asellus, St. Hilaire. 
Asellus aquaticus (Linn.). 
A. aquaticus, G. O. Sars, iSgj, p. 97, pi. XXXIX. ^ 
A. aquatictis, Racovitza, 1919, p. J7, text figs. 1-6. 
Asellus, sp., Hilgendorf, 1874, p. 39. 
