136 History of British Fmtomostrnca. 



motion, as we seldom see those species which have not the filaments 

 long so active in swimming as the others. 



Sp. X. Cypris Compressa. — Plate V. Fig. 7. Testa plano-ro- 

 tundata^ fusco-grisea, compressa. 



Habitat. Yetholm Loch, Roxburghshire ; Rugby, Warwickshire ; neighbour- 

 hood of London, very common. 



Synonimes. Cypris Compressa, Baird, Trans. Berw. Nat. Club, p. 100, pL 

 iii. fig. 16. 



" Shell round-shaped, compressed, rather narrower anteriorly 

 than posteriorly ; of a brownish gray colour more or less deep ; 

 semitransparent ; at either extremity beset with fine hairs — in 

 general the surface of the shell is spotted, as if little pieces were 

 hollowed out of it. Anterior feet provided with three long fila- 

 ments ; eye large ; from the flat compressed shape of shell, its mo- 

 tion through the water is very much like that of some species of 

 Lynceus." 



Sp. XL Cypris minuta. — Plate V. Fig. 11. Testa ovato-glo- 

 bosa, sub-fusca, parva. 



Habitat. At Yetholm, Roxburghshire ; Pond near Copenhagen Fields, Lon- 

 don. 



Synonimes. Cypris minuta, Baird, Trans. Berw. Nat. Club. p. 99, pi. iii. f. 9. 



Monoculus ovum? Jurine, Hist, des Monocles, &c. p. 179, pi. 19. f. 18-19. 



" Shell broader posteriorly than anteriorly ; elevated and round- 

 ed on upper margin ; slightly sinuated on under margin ; hairy all 

 around ; of a light brown colour with a tinge of green ; body of 

 shell smooth, shining ; anterior feet furnished with a pencil of long 

 filaments." This is the smallest of all the species I have met 

 with, and approaches very near to the Man. ovum of Jurine, except 

 that he says his species is perfectly smooth, whereas this one is be- 

 set densely all around shell with short hairs. 



Sp. XII. Cypris Joanna. — Plate V. Fig. 12. Testa ovato-glo- 

 bosa, fusca, hirta. 



Habitat. Pool at Abbey St Bathans, Berwickshire. 



Synon. Cypris Joanna, Baird, Trans. Berw. Nat. Club, p. 99, pi. iii. fig. 8. 



" Shell roundish-ovate ; narrower anteriorly than posteriorly ; of 

 a brown colour, with an orange mark across back of shell and lower 

 margin; shell beset all round with rigid hairs, and covered with 

 minute black points or dots ; setae of antennae numerous. Differs 

 from Cypris pilosa, Muller, in smaller size, orange mark across 

 shell, and in not being glabrous, but marked all over with black 

 roughish-looking points." A little larger than C. minula. 



