RECENT BRITISH OSTRACODA. 



37:5 



in front, the greatest breadth equal to less than half the length. End view oval. The 



surface of the shell is highly polished and marked by closely set longitudinal anasto- 

 mosing striae (fig. 10). Colour dark brown. The anatomical structure agrees closely 

 with that of C. compressa. 

 Length £g in., height -fa in. 



Hab. Greenlea Lough, Northumberland; Mickle Fell, Yorkshire; Connemara (G. S. B,)} Lochmaben 

 (Sir W. Jar dine, Bart.) ; Peterhead Canal (Mr. D. Robertson). 



The form described by me (loc. cit.) as a distinct species under the name of C. striolata, 



is noticed by Dr. Zenker as a variety of C. punctata (compressa); but (he differences in 



size and surface-marking are so conspicuous as to form good specific characters ; more- 

 over the shells of the two species seem to retain their distinctive characters in all 

 stages of growth. Dr. Zenker conjectures, but scarcely believes, that C. strlolata may 

 possibly be the very old state of C. compressa, inasmuch as he has never met with it 

 except in the adult condition. I have, however, seen both young and old indi- 

 viduals, always retaining the distinctive characters of shell-sculpture &c. Cyprus prasina, 

 Fisch, and C. exsculpta, Eisch. (Munich Transactions, Band xvii.), bear some resemblance 

 to the present species in their surface-marking ; but the general form of the carapace 

 seems to differ in both cases. 



18. Cypris ovtjm (Jurine). (Plate XXIV. figs. 31-34, 43-45, and Plate XXXVI. fig. 8 



Monoculus 



sinuated 



Cypris minuta, Baird, Brit. Entom. p. 155, tab. xviii. figs. 7, 8. 



Valves subreniform, convex, greatest height equal to two-thirds of the length. 

 Anterior and posterior margins rounded and nearly equal. Ventral margin distinctly 

 — «. near the middle; dorsal boldly arched, sloping more steeply behmd than m 

 front. Seen from above, the outline is ovate, widest behind the imddle broadly roun led 

 behind, and tapering to a subacute extremity in front: S^ te ^f\^tl^Z 

 - _ the LgtL End view very broadly oval. Surface of the ^ -"*£ 



slightly punctate, Sometimes sHghtly ^fg H^S ^ 



half 



very short. The males, of which I have seen only one imperfect specunen 



have the 



second jaws chelate 

 Length ^ in., hem-lit -A- in. 



^tu 55 m.* iiei iit rs *"• T f j time sup posed 



. This species is very common and widely d.stribu J*£fc«I to . m^ ^ JJ- | 

 Jt to be a form of O. l<evi*, I am unable to »?j^ with ,, ach otll ,,. but 



have noticed it. The two species oecur very genera .^^.^ m dril , vn wcr , 



sometimes separately. The specimens from whic j^ ^ ^ ^^ ^.^ 

 taken at Axwell Park, in the county of Durham. $°- ^^ Selkirkshire, perhaps 



presentations of a form taken by ^^^veT antenna- bore only «* long seta. 

 the young f the present species, though the low u bi 



