Mr, G.S. Brady on Marine. Ostracoda from Tenedos. 221 
two common northern species, P. trigonella and P. mytiloides, 
but cannot, I think, be properly referred to either of them. 
Bairdia formosa, nov. sp. (Plate XIV. figs. 5-7.) 
Carapace, as seen from the side, subtriangular, highest in the 
middle; height equal to considerably more than half the 
length: anterior extremity rounded and bordered below the 
middle with several (usually from six to ten) unequal short 
spines; posterior produced below the middle into a short 
sharp beak, below which it bears a variable number of 
slender curved spines: superior margin very boldly arched, 
inferior almost straight. Seen from above, subrhomboidal, 
widest in the middle, more acutely pointed behind than in 
front ; width equal to half the length. Surface of the shell 
closely and regularly impressed with small rounded punc- 
tures ; colour white. Left valve much larger than the right, 
and overlapping on the dorsum. Length ', inch. 
Cythere crispata, nov. sp. (Plate XIV. figs. 14, 15.) 
Carapace, as seen from the side, compressed, oblong, sub- 
reniform ; greatest height near the middle, and equal to 
rather more than half the length: anterior extremity ob- 
scurely rounded and crenulated below the middle, posterior 
truncate : superior margin gently arched, slightly excavated 
in front of the eyes; inferior almost straight: all the mar- 
gins more or less rugged. Outline, as seen from above, 
oblong, subquadrangular, widest behind the middle, broadly 
mucronate in front, truncate behind, deeply constricted at 
the anterior third, and more gently near the middle; width 
considerably less than half the height. Surface of the valves 
exceedingly irregular, marked with waved, rounded, and 
irregularly flexuous ridges. Colour yellowish brown. 
Length 7, inch. 
This so much resembles, in outline and in style of surface- 
marking, Cythere badia, Norman, that in my ‘ Monograph of 
the Recent British Ostracoda,’ I have, in the note on distribu- 
tion, referred it to that species. A reexamination of the spe- 
cimens, however, has induced me to believe that it ought to be 
considered distinct, though it must be admitted that the dif- 
ferences are chiefly of degree rather than of kind, consisting in 
the larger size and the excessive development of the rugosities 
of the surface. There is, however, a good distinctive character 
in the truncate posterior extremity. It seems to constitute a 
link between C. badia and a form previously (Trans. Zool. 
Soc. vol. v.) referred by me to Cythere canaliculata, Reuss. 
Ann. & Mag. N. Hist. Ser. 4. Vol. ir. 16 
