IMPEEFECTLT-KNOWN OSTEACODA. 195 



Ci/jmdopsis. The characters appear to me to be sufRciently distinct to warrant the 

 adoption of the name as a generic one, and in any case the build of the caudal rami 

 would seem to ally it more closely with Cz/jtris than with Cypridopsis. 



CyPRETTA SAKSi, nom. nov. (Plate XXV. figs. 10-15.) 



Cijpridopsis minna G. O. Sars, Contributions to the Knowledge of the Freshwater Eiitomostraca of 

 New Zealandj p. 30, pi. iv. figs. 3 a-d. 



Shell extremely tumid, ovate ; seen from the side ovoid, highest in the middle, 

 height equal to two-thirds of the length (fig. 10), extremities well rounded, dorsal 

 margin very boldly arcuate, ventral straight, with a slight median sinuation : seen 

 from above (fig. 11) ovate, widest behind the middle, width equal to three-fourths of 

 the length, broadly rounded behind, abruptly tapered and subacuminate in front ; the 

 right valve is higher and longer than the left, overlapping it a little dorsally and in 

 front, also with a protuberant flange in the middle of the ventral margin (fig. 13) ; the 

 anterior margin of the valves forms a narrow, produced lip, within and parallel with 

 which is a series of 12-16 very conspicuous, curved, radiating black bands, connected 

 at their extremities so as to mark off quadrangular spaces (fig. 12). Surface of the 

 shell covered with minute circular impressions and fine hairs ; on the dorsal aspect 

 there is a conspicuous, sharply-defined, angular black patch (eye-spot) extending 

 across the junction of the valves at their anterior third. Colour yellowish-brown; 

 some of the larger specimens green. Length -77 mm. Extremities of the second pair 

 of legs produced into nodulated lip-like processes (fig. 14) ; postabdominal rami very 

 slender, with two slender claws, the larger of which is nearly as long as the ramus. 

 The body and limbs are marked with a few irregular red blotches. 



Hab. St. Thomas, West Indies. Numerous specimens. 



These specimens are I think, without doubt, identical with those described by 

 Professor G. O. Sars under the name of Ct/jmdojjsis minna King. They do not, 

 however, agree with those described by me ^ under that name, which are considerably 

 higher in proportion to their length and have a glistening, yellowish, non-pubescent 

 surface. Sars has, indeed, recognized the difference in outline, and supposes that both 

 Mr. King's drawings and my own are probably incorrect owing to the difficulty of 

 getting a nearly globular shell into accurate lateral or dorsal position ; in this, how- 

 ever, he is mistaken, my drawings, and doubtless Mr. King's, being quite correct. 

 Assuming my previous identification of the Australian specimens as C. minna King to 

 be correct, it becomes necessary to give a new name to the present species. I have 

 pleasure, therefore, in naming it after Professor G. O. Sars. And though Sars seems 

 to agree with Mr. King in thinking that the varieties of colour — green, brown, and 



' " Notes on Fresliwater Entomostraca from South Australia," Proceedings of the Zoological Society of 

 London, 1886, p. 91, pi. s. figs. 1-3. 



VOL. XVI. — PART IV. ]So. 3. — Ap'il, 1902. 2g 



