Mr. G. 8. Brady on Marine Ostracoda from Tenedos. 223 
terminating below in a strong triangular projection: supe- 
rior margin gibbous over the anterior hinge, then deeply 
excavated, and terminating behind in a strong spinous ele- 
vation; inferior straight. Seen from above, the outline is 
hexagonal, deeply constricted in the middle, extremities 
mucronate. Shell-surface covered with closely set angular 
pittings, having an elevated ridge just within and parallel 
to the anterior margin, and two short and sharp longitudinal 
ribs on the central portion of the valve ; one large triangular 
spine at the postero-superior angle, with two or three smaller 
ones below. Length 5’, inch. 
Loxoconcha alata, nov. sp. (Plate XIV. figs. 8-13.) 
Carapace of the female, as seen from the side, flexuous, sub- 
rhomboidal; greatest height near the middle, and about 
equal to two-thirds of the length; extremities obliquely 
rounded, the posterior slightly emarginate above the middle: 
superior margin gently arched, highest in the middle; in- 
ferior sinuated in the middle. Seen from above, the outline 
is rhomboidal, acutely pointed in front, mucronate behind, 
slightly constricted in the middle, behind which the lateral 
alee form two conspicuous protuberances ending abruptly 
behind; greatest width behind the middle, nearly equal to 
the height. The shell of the male is more elongated, nearly 
equal in height throughout, the dorsal margin straight and 
abruptly angular at its posterior extremity. Surface of the 
shell marked with fine, closely set, subconcentrically 
arranged pittings, and having below the middle of each 
valve a subangular aleeform projection. Length J, inch. 
The nearest ally of this species is probably Cytheropteron 
multiforum (Norman). It is, perhaps, questionable whether 
C. multiforum ought not to be referred to the genus Loxo- 
concha; and had I, at the time of writing my monograph of 
the British species, been acquainted with the form now under 
notice, | should probably have taken that view of the matter. 
But, not having seen the animal of C. mu/tiforum, having, 
moreover, seen no female carapaces recognizable as such 
(which in the present species have all the normal characters of 
the genus), and knowing of no instance of a distinct lateral 
ala in Loxoconcha, I was induced to consider it a Cytheropteron. 
It will be interesting, when opportunity occurs, to examine 
the animal of C. multiforum: if it be a true Loxoconcha, we 
must expect some day to find the hitherto overlooked females ; 
if not, the present species would appear to form a curious 
connecting link between the two genera. 
1G 
