Mr. G. S. Brady on Marine Ostracodafrom 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 -^^ 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 

 alae 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 alseform projection. Length -^-^ 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, I should probably have taken that view of the matter. 

 But, not having seen the animal of (7. multiforum^ 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. 



IG* 



