142 History of British Entomostraca. 



so great, that I cannot say any thing further with regard to their 

 economy or habits. The species, however, I have no doubt, are nu- 

 merous, and the labours of any inquirer after them would, I have no 

 doubt, be soon rewarded with great success. 



Species. 



Sp. I. Cythere flavida — " Testa oblonga, glabra." Muller. 



Habitat. Amongst confervae in pools of sea water amongst the rocks on the 

 shore at Cockburnspath, Berwickshire. 



Synonymes. Cythere flavida, Muller, Entomost. p. 66, tab. vii. fig. 5-6. 1785. 



Monoculus flavidus, Gmelin, Syst. Nat. 3001, No. 33. 1788. 



Mon. flavidus, Manuel, Encyc. Method. Tom. vii. p. 725, No. 27, pi. 266, 

 f. 10-11. 1792. 



Mon. flavidus, Fabricius, Tom. ii. p. 494. 1793. 



Cythere flavida, Latreille, Hist. Nat. &c. Tom. iv. p. 253. 1802. 



Mon. flavidus, Rees' Cyclop. Art. Monoculus. 1819. 



Cythere flavida, Desmarest, Consid. Gen. &c. 1825. 

 " Shell oblong, of a yellowish colour, smooth, obtuse at each ex- 

 tremity, narrower anteriorly ; antennae scarcely setiferous." Muller. 



Sp. II. Cy there reniformis. — Plate V. Fig. 16-22. Testa reni- 

 formi, hirta, valvulis crusta calcarea obductis. 



Habitat. Coast of Berwickshire, common. 



Synon. Cythere reniformis, Baird, Trans. Berw. Nat. Club, p. 98, pi. iii. 

 fig. 5. 



Shell reniform, rough with hairs ; both extremities of nearly equal 

 size ; anterior extremity a little flatter than posterior. Centre of 

 valves covered with a calcareous-looking crust, which is of rather a 

 darker colour than rest of shell, and appears studded all over with 

 short spines ; colour of shell a light brownish yellow. It approaches 

 the Cythera lutea of Muller in shape, but differs somewhat in co- 

 lour, in being roughly hairy, and having the valves covered with 

 the hard crust. 



Sp. III. Cythere albo-maculata — Plate V. Fig. 23. Testa ob- 

 longa, sinuata, valvulis crusta calcarea albo-maculata obductis. 

 Habitat. Berwick Bay — not very common. 



Shell oblong, a little flatter at anterior extremity ; slightly round- 

 ed on upper margin, and deeply sinuated on lower, near anterior ex- 

 tremity. Each extremity and lower margin densely hairy ; middle 

 portion of valves covered with a calcareous-looking crust, as in last 

 species, which is studded all over with short spines, except where it 

 is marked with two white smooth shining spots of considerable size. 

 Shell altogether of a dull-brown colour. 



