98 MR BAIRD ON THE ENTOMOSTRACA OF BERWICKSHIRE. 



terminated by two or three short setce. All four antennae setiferous at base 

 of articulations. Head beaked. Beneath the antennae are two organs (palpis ?) 

 of two articulations, setiferous at base of articulations and at extremities. Be. 

 neath these are two organs, which M uller calls hands, of two articulations, termi- 

 nated by a strong curved moveable claw or hook ; and beneath these again, are two 

 double organs, or membres particulieres 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 setae ; the inferior, also serrated above, and terminated by three seta?, but 

 consisting only of one articulation. From the three inferior articulations of the 

 body arise three pairs of long setiferous feet ; and from the second articulation of 

 the tail arise the sexual organs in either sex. This species approaches the C. che- 

 lifer of Muller, but differs in many points when closely examined. In Muller's 

 species there are no articulations 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 be. 

 neath these, which I call " palpi," are furnished with a claw, and only of one arti- 

 culation, 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 bullae 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 see- 

 ing 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 flavida, Muller, p. 66, tab. vii. fig. 5, 6 Amongst Confervas in pools 



of sea-water at Cockburnspath. 



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

 path. 



3. C. reniformis. Nova species. PL III. fig. 5 Sea-shore at Berwick and Eye- 

 mouth, &c Shell reniform ; flesh-coloured ; covered with hairs ; both extremities 



of equal size ; antennae furni shed with numerous short setae to all articulations ; 

 anterior feet falcate, entire; all the feet furnished with claws. This species ap- 

 proaches the C. viridis of Muller, bnt 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. PL III. fig. 6 Shore near Dunbar. Shell white, 



transparent, hairy, acute at posterior extremity, and broader 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. PL 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 ; 

 antennas slender, without setae. 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 ;./%. a., other specimens 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; 

 Jig. 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. Fu- 

 ture observations may perhaps determine them to be of two different species. 



GENUS III. CYPRIS. 



1. Cypris detecta, Muller, p. 49, tab. iii. fig. 1-3. C. cmchacea t Desmarest 



Pool on Beaumont Water at Yetholm. 



