History of British Entomostraca. 143 



Sp. IV. Cythere alba. — Plate V. Fig. 24. Testa alba, trans- 

 lucida, obovata. 



Habitat. Sea-shore at Dunbar, East Lothian. 



Syn. Cythere alba, Baird, Trans. Berw. Nat. Club, p. 98, pi. iii. fig. 6. 



Shell white, transparent, showing the dark body of insect through 

 it ; hairy round edges ; acute at posterior extremity, and broader at 

 anterior ; a margin round the outer edge of the shell whiter than 

 the rest. Having only once met with this curious species, and an ac- 

 cident happening to the vessel in which it was kept, I am unfortu- 

 nately unable to give a fuller description of it. 



Sp. V. Cythere variabilis — Plate V.Fig. 25, a b. Testa ovale, 

 glauca, glabra. 



Habitat. Coast of Berwickshire, common. 



Syn. Cythere variabilis, Baird, Trans. Berw. Nat. Club, p. 98, pi. iii. fig- 7, 

 a.b. 



Shell glaucous, without any hairs, perfectly oval-shaped, ante- 

 rior extremity narrower than posterior ; anterior legs falcate, and 

 furnished with pretty strong claws; antennae slender, without setae. 

 This species varies much in colour, and markings ; some specimens 

 are white, with two black fasciae running transversely across shell, 

 one at posterior margin, the other across the centre of the shell, 

 while the posterior extremity is marked besides by a beautiful red- 

 dish or bright bronze spot. (Fig. 25, a.) Other specimens are of a 

 light flesh-colour, with the edges of shell slightly greenish, and the 

 body of shell marked with dark streaks running across. Some are 

 altogether of a fine flesh-colour, without any marks upon the shell, 

 while others again are of a uniform dark- brown or almost black. 

 (Fig. 25, b.) All the varieties, however, agree in shape of shell, 

 in size, &c. merely differing in colour and marks. 



Sp. VI. Cythere aurantia. — Plate V. Fig. 26. Testa ovata, 

 reniformi, glabra, aurantia. 



Habitat. Bei wick- Bay, not uncommon. 



Shell rounded and rather prominent on upper margin ; slightly 

 reniform on under ; rather broader posteriorly than anteriorly ; 

 smooth, glaucous, of a bright orange-colour ; very minute in size ; 

 antennae setiferous ; anterior feet falcated. 



Sp. VII. Cythere nigrescens. — Plate V. Fig. 27. Testa extre- 



mitate postrema acuminata, glabra, sub-nigra. 

 Habitat. Berwick-Bay, not uncommon. 



