100 MR BAIRD ON THE ENTOMOSTRACA OF BERWICKSHIRE. 



hairs covering the shell ; antennae slender ; setae seldom much divaricated, about 

 welve in number. The markings of shell are not in all specimens very distinct. 



15. C. lucens. Nova species, Pi. III. fig. 15. Yetholm Loch and pools on Beau- 

 mont Water. Shell white, shining, without spot; almost opaque ; venlricose ; 



elevated on upper margin towards posterior extremity, and reniform underneath ; 

 anterior extremity narrower and flatter than posterior, which is arched and broad, 

 the inferior angle being, however, prolonged to a point ; a few fine hairs at each 

 extremity. This species differs from C. detecta in being ventricose, and more 

 arched in upper margin ; and from C. catidida in being renitonn, in not being ovate, 

 and in want of rigid hairs which beset that species. 



16. C.compressa. Nova species. PI. III. fig. 16 Yetholm Loch. Shell round, 



shaped, compressed rather narrower anteriorly than posteriorly ; of a grey colour, 

 more or less deep ; semi-transparent ; at either extremity beset with fine hairs ; 

 in some specimens spotted as if little pieces were hollowed out ; anterior feet pro- 

 vided with several long bristles ; eye large ; antennae terminated by numerous 

 long setae. From the nat compressed shape of shell, its motion through the water 

 is very much like that of some species of Lynceus, 



GENUS IV. DAPHNIA. 



1. Daphnia quadrangula, Muller, p. 90, tab. xiii. fig. 3, 4. Ditch near Berwick. 



2. D. pulex^ Desmarest, Leach, Latreille. D. pennata, Muller, p. 82, tab. xii. 



fig. 4-7. Monoculus pulex, Linne and Fabricius Pulex caudatus, SchaefFer. 



Near Berwick, at Coldstream, and near Routing Linn at Fenton. 



3. D. sima, Muller, p. 90, tab. xii. fig. 11-12. D. vetula, Straus. Pulex non 

 caudatus, Schaeffer Common about Cockburnspath, Yetholm, &c. 



GENUS V. LYNCEUS. 



1 Lynceus spharicus Muller, p. 71, tab. ix. fig. 7-9. Monoculus sphcericus, Fa- 

 bricius Common in all the ditches and ponds throughout the district. 



2. L. quadrangularis, Muller, p. 72, tab. ix. fig. 1-3. In the Pease Burn, and 



in a pool on Beaumont Water at Yetholm. 



3. L. lamellatus, Muller, p. 73, tab. ix. fig. 4-6 Yetholm Loch, and in a pool 



on Beaumont Water at Yetholm This is a very fine large species, about the 



size of Daphnia pulex, but Muller's plate of it does'not appear to me to be a good 

 one. 



4. L. trigonellus, Muller, p. 74, tab. x. fig. 5-6. L. laticornis, Desmarest. 



Pond at Foulden, and at Yetholm. 



5. L. truncatus, Muller, p. 75, tab. xi. fig. 4-8 Pool on Beaumont water at 



Yetholm. Muller says he found this species once in autumn 1782, but never 



met with it afterwards. It appears, therefore, to be a very rare species, and is a 

 very beautiful one. 



6. L. harpae. Nova species. PI. II. fig. 17. Pool on Beaumont Water, and in 



Dunglass Pond Shell harp-shaped; ribbed longitudinally, the ribs resembling 



the strings of the harp ; rounded posteriorly, sinuated anteriorly, and terminating 

 in a point projecting forwards ; antennae four, long, nearly the length of the shell, 

 each consisting^of three articulations, and terminated by three long linear setae ; 

 shell smooth, except anterior edge where it is sinuated, being there ciliated ; tail 

 serrated, terminated by two strong setae ; head rounded, and beak blunt. Differs 

 from L. truncatus in sinuated anterior margin of shell, blunt beak, and long antennae ; 

 in not being truncated on posterior extremity ; in wanting the thirteen little teeth 

 at the base ; and in wanting the two thick and large upper feet : differs from L. 

 quadrangularis in shape, in sinuated anterior margin, in more distinct rios, and in 

 blunt beak. 



7. L. hamalw. Nova species. PL II. fig. 18. Yetholm Loch. Shell truncated 



anteriorly, and ciliated ; upper part gibbous ; tail not serrated, gibbous, terminated 

 by two setae ; two upper feet large, and each furnished at extremity with a strong 

 claw or hook curved upwards ; antennae of three setae each : approaches L. trigo- 

 nellus, but differs from it in beak being blunted and stronger ; in tail not being 

 serrated; in wanting the strong pediform organ below palpi and aoove the feet; 

 and in the upper feet having the strong hooks. 



