36<; 



MONOGRAPH OF 



however this term has no applicability ; and I have therefore adopted Mr. Norman 



S{)( 



ific name. 



7. Cviris bispinosa, Lucas. (Plate XXVI. figs. 14-17.) 



(M 



narrowing 



Carapace oblong, subpyramidal, very tumid on the ventral surface, and gradually 



towards the dorsum. The ventral margin is elevated into a broadly rounded 

 dge which runs backwards, becoming gradually narrower and more sharply defined, 

 1 it ends, considerably behind the middle of the valve, in a sharp, curved, projecting 

 spine: anteriorly the ridge curves upwards, and is gradually lost on the surface of the 

 shell. The anterior margin is narrow and rounded. Dorsal margin arched, highest a 



— 



-> 



little in front of the middle, where it is angular or gibbous, sloping equally to each 

 extremity. The posterior extremity forms a slightly produced beak a little below the 

 median line of the valve, thence sloping steeply upwards to the dorsal, and curving 

 gently downwards to the ventral margin. Seen from above, the outline is tumid, oval, 

 with acutely pointed extremities, the anterior of which is produced so as to form an 

 " ogee " outline ; the lateral spines are very conspicuous both in the dorsal and ventral 

 aspects. End view triangular, base flattened, sides convex, lateral angles produced and 



rounded. Surface smooth, very finely punctate. Colour light green. 

 Length J in., height yg- in. 



For specimens of this noble species (the finest British Cypris) I am indebted to the 

 Rev. A. M. Norman, to whom it was forwarded some years ago by Dr. Lukis of Guern- 

 sey, who took it in a freshwater pool in that island. Dr. Baird identifies the specimens 

 with Cypris bispinosa, Lucas, which was found in Algeria " in a little streamlet of fresh 



flowing from the Boudigma 



and Nat. Hist. Brit. Entom. p. 156, 



8. Cypris gibbosa, Baird. 



Cypris gibbosa, Baird, Mag. Zool. & Bot. i. p. 137, t. v. fig. 15, 1837; 



t. xix. fig. 8. 



" Shell ovate, and much elevated on the upper margin, the centre exhibiting a large 

 gibbosity or hump ; sinuated underneath. The valves are smooth, except round the 

 edges, which are beset with short fine hairs, are nearly opaque, and of a light green colour, 

 the anterior extremity being paler than the other parts of the shell. Filaments of both 

 pairs of antenna? beautifully plumose. 



u 



Hub 



I know nothing of C. gibbosa, except from Dr. Baird's description. 

 9. Cypris tessellata, Fischer. (Plate XXIII. figs. 39-45.) 



Cypris tessellata, Fischer, Memoires des Savants Etrangers, St. Petersburg, vol. vii. p. 159, pi. x. figs. 1-5- 



'iffinw, juuyeoorg, 



8-14 : Bradv. Ann. & Mag. Nat 



6-11 



6-11, and Trans. Tyneside 



Carapace oblong, tumid, broad in front, and tapering backwards from the anterior third 



