from the Mauritius. 179 
of distribution, extending even into the European seas. Some 
additional species from the same locality will be described in a 
future Number of ‘ Les Fonds de la Mer.’ 
List of Species. 
Pontocypris attenuata, nov. sp. Cythere hamigera, nov. sp. 
Dayisoni, nov. sp. bispinosa, ov. sp. 
Macrocypris maculata, Brady. convoluta, nov. sp. 
Cythere demissa, nov. sp. Cytheridea punctillata, Brady. 
plana, nov. sp. spinulosa, nov. sp. 
fumata, nov. sp. Loxoconcha Lilljeborgii, nov. sp. 
—— Hodgii, Brady. Xestoleberis margaritea, Brady. 
Darwinii, Brady*. | 
Pontocypris attenuata, nov. sp. (Plate LV. figs. 11-14.) 
Carapace, as seen from the side, subtriangular or siliquose, 
highest in front of the middle, and tapering to a point be- 
hind; greatest height scarcely equalling half the length : 
anterior extremity broadly rounded ; posterior subacutely 
pointed: superior margin obtusely angular at its highest 
point, from which it slopes steeply backwards with a gentle 
curve; inferior slightly sinuated about the middle: outline, 
as seen from above, compressed, somewhat clavate, widest 
at the anterior third, rounded and slightly mucronate in 
front, pointed behind ; greatest width equal to rather more 
than a third of the length. End view oval, widest in the 
middle. Surface of the shell smooth, slightly punctate, and 
clothed with numerous exceedingly short and fine hairs. 
Colour pale yellowish brown. Length 34; inch. Animal 
unknown. 
This pretty species approaches very closely to the European 
P. mytiloides, but is paler in colour, less distinctly pubescent, 
has a more shining surface, a more angular dorsal margin, and 
is also destitute of serratures at the posterior extremity. 
Pontocypris Davisont, nov. sp. (Plate XIII. figs. 9, 10.) 
Carapace of the female (?) somewhat tumid, as seen from the 
side subreniform, highest in the middle; greatest height 
fully equal to half the length; rounded in front : posterior 
extremity rounded off below, scarcely angular; superior 
margin boldly arched, highest in the middle, inferior sinuated 
in front of the middle. Seen from above, the outline is 
ovate, widest near the middle, pointed in front, rounded be- 
hind; width much less than the height. The surface of the 
shell is granular or very finely punctate, and quite devoid 
* Deseribed in ‘ Les Fonds de la Mer.’ 
