History of British Entomostraca. 525 
that they do not appear to be the same species. Misled by the figure 
which Muller gives, I made it a new species in the Transactions of 
the Berwickshire Naturalists' Club, under the name of C. liistriata, 
having quoted the young as the pubera. The quotations and syno- 
nimes of both Muller and Jnrine are at variance with each other, 
and many in both authors are, I think, injudicious and incorrect. 
The shell is of an oval shape, and reniform, valves convex, of a 
green colour, more or less deep ; anterior portion of shell of a deep 
green, immediately behind which is a portion of a lighter colour ; 
posterior part of shell of a less deep green than anterior, and through 
it run obliquely, from near upper and middle part^of shell, two and 
sometimes three narrow bands of a deeper colour than any other part 
of shell. In some specimens, generally the largest, the shell is of 
nearly a black colour, from the dirt which adheres to the valves ob- 
scuring the marks which distinguish the species, and making it ap- 
pear almost like a different one. Nearly in the centre of each valve 
are to be seen a congeries of about seven small lucid spots. The 
whole shell is densely hairy ; antennae of about fourteen filaments, 
beautifully plumose ; filaments of anterior feet about six, also fine- 
ly pennated. 
Sp. II.- Cypris de/ecta.~Testa reniformis, pellucida, plana. 
Habitat. Berwickshire and Roxburghshire : neighbourhood of London, &c. 
Synonimes, Sfc. Ledermuller ; Mikroskopischen Gemiiths und augenergotzung, p. 
140, tab. 73, 1760. 
Smooth white insect, Mutter, Philos. Trans. Vol. Ixi. p. 230, tab. 7, fig. 13, 
1771. 
Cypris detecta, Do. Zoolog. Dan. prodrom. p. 199, No. 2386, 1776. 
Cypris detecta, Do. Entomostraca, p. 49, tab. iii. fig. 1 3, 1785. 
Monoc. detectus, Gmelin, Syst. Natur. 3001, No. 36, 1788. 
Mon. detectus, Manuel, Encyc. Method. Hist. Nat. Tome vii. p. 725, No. 80, 
pi. 266, fig. 15-17, 1792. 
Monoc. Conchaceus, Fabricius, Entomol. Systeroat. Tom. ii. p. 495, 1793. 
Cypris detecta, Latreille, Hist. Nat. Gen. et Part, des Crustaces, &c. Tom. iv. p. 
241, 1802. 
Monoc. detectus, Rees 1 Cyclopedia, Art. Monoculus, 1819. 
Monoc. Conchaceus, Jurine, Hist, des Monocles, &c. p. 171, tab. 17, fig. 7-8> 
1821. 
Cypris Conchacea, Desmarest, Consid. Gen. sur les Crust, p. 383, 1825. 
Jurine quotes as synonimes of this species, but unadvisedly in my 
opinion, the Mon. Conchaceus of Linnaeus' Fauna Suecica, the de- 
scription of which, I have already said, would answer any other spe- 
cies as well the Mon. d coquille longue of Geoffroy, and the Mon. 
ovalo-conchaceus of De Geer. The first of these two last is also 
