than with the ventral ridge. It is oval shaped, while the longitudinal 
axis is placed almost perpendicularly to that of the carapace. 
By a line which is concave towards the end it is divided into 
two unequal parts. 
While from this line towards the front as well as towards the 
back crosslines originate, the muscle impression consists of two rows of 
oblong parts. Undoubtedly the valves which | have at my disposal 
originate from Cytherella semitalis G. S. Brapy, which appears at 
once from the characteristic sculptures on the outer surface. This 
shows small round pits round about a broad smooth stripe which 
runs lengthwise across the middle, as is reported and illustrated by 
Brapy. With the exception of the posterior ridge these pits are also 
missing at the edges of the valves, except in the middle. Brapy does 
not point out this but from the sketches which he gives of this 
species it appears that this is also the case with the recent animals. 
It is true that the carapace of the animal depicted by Brapy 
in fig. 2a is different, but that is no objection. Brapy tells 
us, as a matter of fact, that the illustrations have been made from 
a specimen not yet fullgrown and there the height of the carapace 
remains the same along a great length, so that viewed laterally it 
is elliptical. That can be distinetly seen in the smaller valves of my 
material. 
The measurements of a right valve are: length 0,63 mm., height 
0,40 mm. and width 0,17 mm. while those of a left valve are 
0,62 mm., 0,37 mm. and 0,14 mm. 
Recent specimens of these Ostracods were caught in the East 
Indian Archipelago and near Samoa. 
From what is said above it is clear, that as a rule the same or 
related Ostracods are described by Brapy in the “Challenger report” 
and that these therefore still occur in the neighbourhood of Timor. 
If we consider in the treatise mentioned above, at what depth 
this species is found, it appears, that it usually is less than 72 m. 
Finally I want to express my thanks to Prof. Dr. J. H. Bonnema, 
who has always so willingly put his time at my disposal in order 
to assist me in the treatment of this material and to Mr. J. Borkr, 
biol. doct"s, who was so kind as to make the drawings for this essay. 
