RECENT BRITISH OSTRACODA. 



377 



3. Cypridopsis villosa (Jurine). (Plate XXIV. figs. 11-15, and Plate XXXVI. fig. 9.) 



Monocles 



Westwoodii 



? elongata, Baird, Brit. Entom. p. 156, pi. xix. fig. 6. 



Carapace compressed, oblong, reniform; height equal to more than half the length. 

 The dorsal margin is boldly arched, highest in the middle; the ventral margin deeply 

 incurved along its entire length. The anterior border is broad and rounded, the posterior 

 somewhat produced, forming an obscure angle inferiorly. Outline, as seen from above, 

 compressed, oval, pointed in front and rounded behind ; about twice and a half as long 

 as broad. End view oval, rounded at the base, pointed above. Surface of the shell 

 covered with long, fine hairs. Colour light grass-green. 



Length -£- in., height ys in. 



This is one of the less common species of freshwater Oyprida?. It has been found at 

 Yetholm Loch, Roxburghshire, by Dr. Baird ; at Sedgefield, Durham, by the Rev. A. 

 M. Norman; in moorland pools near Easedale Tarn, Westmoreland, in a pool near 

 Cotherston, Yorkshire, in Belsay East Lake and near Crag Lake, Northumberland, and in 

 ponds at Silksworth and Eulwell, near Sunderland, by myself; also by Mr. D. Robertson 



in a pool near Banff. . . . 



The nearest ally of this species is C. aouleata (Lillj.). C. villosa, however, is much 

 less tumid, the ventral margin much more deeply arched, the dorsal margin not rising 

 to a point, while the surface of the shell is destitute of spines, and clad with much less 



rigid hairs than those of C. aculeata. 



Cypris elongata, Baird, appears to me to be the young form of C. villosa. 



Genus 3. Paracypris, G. 0. Sars. 

 ' Shell smooth, compact, much higher in front than behind Upper «taMM «n» 



jointed, shortly 'setifeLs ; lower ^^^^^<£^2 



of which are nearly equal to ?^*^J^2fflbi« terminating in five 



joint bearing at its base a pedicellated J£«~V from the w joints of which 



or six rather long teeth, and bearing a four-jointed pa p, trom in j 



. ,. , j„„„ << The external lobe or palp ot the lirst pair 01 



springs a narrow branchial appendage. The «**» f ■ ' vided with a bran- 



jaws linear, scarcely broader than the rest. Second J-^JJ* Last r of fpct 

 ehial appendage ; the palp ^^T^X^ 5 •— 4 * a ""* 



similar to the first in form and size ; both pairs nve ju 



*• i . most of mv British specimens having come into my 

 * I have had no opportunity of verifying these particular , m ^^ ^ ^.^ ^ ^ ^^ ^.^ 



hands either as mere empty shells, or containing, at best, muti a e ^ • ^ ^ ^ ^ ^ ^^ ^ ^^ 

 contained within inverted commas is, therefore, quoted from G. . ^J^^ from the same source , a nd are inserted 

 similar quotations are made in subsequent parts of this memoir^ ^ey are ^ ^ ^ ^ ^^ ^ ^ ^^ ^^ 

 f or the same reason. The drawings, however, it may be proper » ^ ^ Xorwegian spec imens, I have, in some 



from nature ; and through the kindness of Herr G. 0. Sars in tur ^ j^ ^ haye been derive d from British examples, 

 cases, been able to give illustrations of the anatomy of species w ic i co^ ^^ practica ble, I have always preferred to 

 These remarks apply almost exclusively to the very rarest species ; ^ doubt as to ^ 



^w from native specimens, and have never used foreign ones when there com 



VOL. XXVI. 



