98 MR BAIRD ON THE ENTOMOSTRACA OF BERWICKSHIRE. 



articulations, terminated by a strong curved moveable claw or hook ; and beneath 

 these again, are two double organs, or msmhres particuUeres of the French 

 authors, each pair consisting of a short strong common footstalk, from which 

 arise two flat bodies, the superior of which is the longer, of two articulations, 

 serrated above, and terminated by three short seta3 ; the iriferior, also serrated 

 above, and terminated by three setee, but consisting only of one articulation. 

 From the three inferior articulations of the body arise three pairs of long seti- 

 ferous feet ; and from the second articulation of the tail arise the sexual organs 

 in either sex. This species approaches the 0. cheMfer of Muller, but differs in 

 many points when closely examined. In Muller' s species there are no articula- 

 tions to the body, which gradually tapers to the tail, and which he describes as 

 " farciminis facie." The superior antennae are only of three articulations ; the 

 inferior, which he calls "palpi," of two. The organs beneath these, which I call 

 " palpi," are furnished with a claw, and only of one articulation, whilst the last 

 pair of particular members, have only the shorter of the two bodies of which 

 they are composed, serrated, the longer being entire. The male in Muller's 

 figure has not the buUas on antennae. 



Genus II. Cythere. 



None of the authors, since Muller's time, who have written upon the " Ento- 

 mostraca," from their residing in inland situations, have had opportunities of 

 seeing the insects belonging to the genus Cythere, as they are only to be found 

 in sea-water. Their history, therefore, is in more obscurity than any of the other 

 genera, both as regards their economy and the number of species. No new 

 species, as far as I am aware, have been added to the five of Muller, by any of 

 the writers on " Entomostraca ; " but that there are more to be met with by a 

 little investigation, is very evident from those I have discovered on the coast. 



1. Cythere Jiavida, Muller, p. 66, tab. vii. fig. 5, 6. Aiuongst Confervae in 



pools of sea-water at Cockburnspath. 



2. C. gibhera, Muller, p. 66, tab. vii. fig. 10-12. Sea shore at Cockburnspath. 



3. C. reniformis. Nova species. PI. III. fig. 5. — Sea-shore at Berwick and 



Eyemouth, &c. Shell reniform; flesh-coloured; covered with hairs; both 



extremities of equal size ; antennas furnished with numerous short setae to all 

 articulations ; anterior feet falcate, entire ; all the feet furnished with claws. 

 This species approaches the C inridis of Muller, but differs in colour, in both 

 extremities of shell being equal, and in anterior feet not being serrulated. It 

 differs from C. lutea in shell being covered with hairs. 



4. C. alba. Nova species. PI. III. fig 6.... Shore near Dunbar. Shell white 



transparent, hairy, acute at posterior extremity, and bi"©ader at anterior ; a rim 

 round edge of shell whiter than the rest of shell ; antennae beset with short setae 

 at each articulation. 



5. C. variabilis. Nova species. PI. III. fig. 7. a. b. — Shore at Cockburnspath 



and Eyemouth. Shell glaucous, without hairs, ovate, anterior narrower than 



the posterior extremity ; anterior legs falcate, and furnished with pretty strong 

 claws ; antennae slender, without sette. This species varies much in colour and 

 markings. Some specimens are white, with two black fasciae, one at posterior 

 margin, and the other across centre of shell, while the posterior extremity is 

 marked besides by a beautiful reddish or bright bronze spot; fig. a., other speci- 

 mens are of a light flesh colour, with the edges of shell slightly greenish, and the 

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

 of a fine flesh colour; fig. b., while others again are of a very dark brown. All 

 the varieties, however, agree in shape of shell, in size, &c., merely differing in 

 colour and marking. Future observations may perhaps determine them to be of 

 two different species. 



Genus III. C\tris. 



1. Cypris defeda, Muller, p. 49, tab. iii. fig. 1-3. — 0. conchacea, Desmarest. 

 Pool on Beaumont Water at Yetholm. 



2. C. strigata, Muller, p. 54, tab. iv. fig. 4-6. Brackish water on sea-shore 



at Thornton Loch, near Cockburnspath. 



3. C. vidua, Muller, p. 55, tab. iv. fig. 7-9. Dunglass Pond. 



