RECENT BRITISH OSTRACODA. 



371 



antennae and the second pair of jaws renders it impossible to retain it in the position 

 which it at first occupied as a Candona. The same remark applies also to the following 

 species, C. serrata. 



The species described by me in another place under the name Candona virescens, I now 

 believe to be the young of C. reptans. 



15. Cypris serrata (Norman). (Plate XXV. figs. 15-19, and Plate XXXVI. fig. 3.) 



Candona serrata, Norman, Ann. & Mag. Nat. Hist. vol. ix. (1862) p. 46, pi. ii. figs. 1-6; and Trans. 

 Tyneside Nat. Field Club, vol. v. p. 148, pi. iii. figs. 1-6. 



Valves subtriangular, oblong, broad and rather squared in front, narrow and obliquely 

 rounded behind. The ventral margin is nearly straight, the dorsal margin much elevated, 

 and gibbous at the anterior third, sloping steeply towards each extremity. Anterior 

 margin broad and only slightly rounded at the angles, armed along the lower half of both 

 valves with a row of from eight to ten spines. The posterior margin is, in like manner, 

 set with six or seven spines. Seen from above, the outline of the shell is oblong-oval, 

 widest in the middle and tapering to each extremity. End view tumid, broad and 

 rounded at the base, pyramidal at the apex. The colour of the shell is pale grey, 

 marked with a central patch of lighter hue and two large patches of deep brown, 

 which form a broad but interrupted zone round the central space. The depth, as well 

 as the disposition, of the colours, however, is subject to considerable variation. Surface 

 marked with impressed punctures, and beset with scattered hairs. Lucid spots seven, 

 oblong, arranged irregularly near the centre of the valve, with their long axes nearly 

 parallel with that of the shell. The most usual arrangement of the spots in this species, 

 as also in C. reptans, is as follows : — a central row of three spots placed parallel to each 

 other and transversely across the shell ; two spots slightly in advance, and often coales- 

 cing below ; the remaining two behind. A comparison of the figures (PI. XXV. figs. 14 

 & 19) will show that this arrangement differs only slightly from that of C. reptatis. 

 The second joint of the lower antenna bears a brush of five simple non-plumose and 

 very short setse, springing from near its apex, and reaching not much beyond the middle 

 of the third joint, which also bears four or five similar setse reaching scarcely beyond 

 the base of the terminal claws (Plate XXXVI. fig. 3). The postabdominal rami and 

 their terminal setae are long, slender, and without serratures. The second foot, both 

 in this species and in C. reptanSy bears a small hooked claw and setse, just as in 

 C. virens. 



Length in., height \. o4nvNv^ >^ .(^ -vvvw^ 



Hab. Cypris serrata was first described by the Rev. A. M. Norman from specimens taken by liim at 

 Sedgefield. I have myself taken it at Fardingslake, near Sunderland; and I am indebted to 

 Mr. W. W. Stoddart for specimens from Ashley Brook, Bristol, where it seems to be very 

 abundant. 



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