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. Irislriata, 

 having quoted the young as the pubera. The quotations and syno- 

 nimes of both Muller and Jurine 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 detecta. — : Testa reniformis, pellucida, plana. 



Habitat. Berwickshire and Roxburghshire : neighbourhood of London, &c. 

 Synonimes, &fc. Ledermuller ; Mikroskopischen Gemuths und augenergotzung, p. 



140, tab. 73, 1760. 

 Smooth white insect, Muller, Philos. Trans. Vol. lxi. p. 230, tab. 7, fig. 1— ii, 



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. 30, 



pi. 266, fig. 15-17, 1792. 

 Monoc. Conchaceus, Fabricius, Entomol. Systemat. Tom. ii. p. 495, 1793. 

 Cypris detecta, Latreille, Hist. Nat. Gen. et Part, des Crustaces, &c. Tom. iv. p. 



241, 1802. 

 Monoc. detectus, Rees' 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 tongue of Geoffroy, and the Mon. 

 ovalo-conchaceus of De Geer. The first of these two last is also 



