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posterior extremity. With the young specimens the carapace is much 
higher in front than at the back, so that then the shape agrees 
more with that which occurs most in Cytheridea. 
The outer surface of the valves which are always firm, shows 
fairly large, somewhat round pits, which are placed close together 
and which are in more or less concentric rows towards the edges. 
Both valves have short teeth on the front edge, which end obtusely 
and are somewhat buffer-shaped. At the hind-edge. on the other hand, 
the right valve has underneath a plate-shaped protuberance, fringed 
with a few small teeth and the left one a few small teeth without 
a plate. 
The valves are unequal. The right one is smaller and slenderer 
than the left one and the latter overlaps the former on all sides. The 
hingement consists of two crests in the case of the right valve and 
in that of the left in two furrows corresponding to this with 
cross furrows. The “Verwachsungslinie’ and the “Innenrand” only 
do not coincide in the front. They run everywhere about parallel 
with the carapace edge. In the place where the inner and outer 
sheet are grown together, are numerous “Porenkanäle”, which some- 
times bifureate. I could notice nothing of muscle impressions. Of 
an entire carapace the length is 0.62 mm., the height 0.87 mm. 
and the width 0.29 mm. 
I think I may safely infer from this, that these rests originate 
from Cytheridea spinulosa G. S. Brapy, though there are perhaps a 
few differences. 
First of all the left valve does not possess the fold near the front 
part of the hingement, which according to the figures from the second 
of the above-mentioned publications of Brapy are present in this 
species. However it is not to be found in the sketches of his first 
publication. 
Moreover the spines, which occur at the under part of the posterior 
ridge of the valves, are more highly developed in the recent ones. 
However I do not consider this difference sufficiently large to class 
these rests as a new species. 
Recently this kind was found near the Fidschi islands, Mauritius, 
New Caledonia and the East Indian Archipelago. 
7. CYTHERIDEA TIMORENSIS n. sp. (Fig. 9). 
The Cytheridea species which is only represented by some loose 
valves and which up till now I found nowhere described, resembles 
the preceding one in many respects. Besides the characteristics, from 
