MR 1IA1RD ON THE BNTOMOSTRACA OF BERWICKSHIRE. 97 



have, in an autumn's search in one district, found thirty-eight species 

 belonging to the order Branchiopoda alone. In the arrangement of the 

 genera I have followed Latreille in Cuvier's Regne Animal ; but with 

 regard to species I have taken Muller as my text-book, along with Des- 

 marest in his work on the Crustacea. Latreille divides the Entoinostraca 

 into two Orders, the Branchiopoda and the Pcecilopoda. The order 

 Branchiopoda he divides again into two principal sections, the Lophy- 

 ropa and Phyllopa ; to the first of which I for the present confine this 

 catalogue. 



CLASS ENTOMOSTRACA ORDER BRANCHIOPODA. 

 SECTION I. LOPHYROPA. 



GENUS I. CYCLOPS. 



1. Cyclops staphylinus, Desmarest C. minutus, Muller, p. 101, tab. xviL fig. 1- 



7 Canthocarpus ttaphylinus, J. O. Westwood, MS. Common in pools of fresh 



water and ditches. The figure of this species, as given by Muller, is but indiffe- 

 rently correct ; I have therefore sketched it as it has occurred to me. PL II, fig. 1. 

 l>esmarest calls it " staphylinus," from its habit of turning up its tail like the 

 staphylinus. From some difference in the antennae, and from the peduncle 

 attached to the tail, it has been proposed to form a particular division for this spe- 

 cies. My friend Mr Westwood has formed a new genus of it, which he calls 

 " Canthocarpus.'* PL II. figs. 19, 20, are the young of this species in different 

 stages. 



2. Cyclops rubens, Muller, p. 104, tab. xvi. fig. 1-3 C. castor, Desmarest 



Disptomus castor, J. O. Westwood, MS Found in Dunglass Pond, and about 



Yetholm. It has been proposed to form a distinct group for the reception of this 

 species, from the division of the inferior antenna? and palpi. It has been formed 

 into a new genus by Mr Westwood, and called Disptonuu. PI. II. fig. 2 is the 

 young of this species, a few hours after birth. 



3. C. lacinulatus, Muller, p. 105, tab. xvi. fig. 4-6. C. castor, Desmarest 



Found in Yetholm Loch, along with C. rubens. Desmarest makes the C. aeruleus, 

 rubens, and lacinulatus, into one species, which he calls C. castor* the lacinia? of 

 this species being considered infusory animalcula attached to the taiL If it be 

 a mere variety, it is somewhat curious that these animals should adhere only to 

 this species, and that they should occur the same in Scotland as in Denmark. 



4. C. vulgaris, Desmarest. C. quadricomis, Muller, p. 109, tab. xviii. fig. 1-14. 

 Pediculus aquaticus, Baker, Microsc. p. 496, tab. xv. fig. 1-4 Monoculvsquadri. 



cornis, Linne, Fabricius, and Donovan Very common in all pools, ditches, &c. 



throughout the district. Desmarest has changed the name of this species from 

 quadricornis to vuloaris, and much for the better, as the epithet quadricarnu would 

 lead one to suppose that this species alone bad four antenna?, whereas all the species 

 we know have that number. PL II. fig. 3 is the young of this species twenty-four 

 hours after birth ; and fig. 21, three weeks old, being the NaupKu* saltatorius of 

 Muller. 



5. C. minrticornu, Muller, p. 117, tab. xix. fig. 14, 16. Pools of sea-water at 



Cockburnspath and Berwick. The young is the Amymone thya, of Muller, p. 47, 

 tab. xi. fig. 16, 17. 



6. C. breoicornis, Muller, p. 118. Pools of sea-water at Cockburnspath. 



7. C. Johnston*. Nova species. PL II. fig. 4. Pools of set- water at Berwick 



and Cockburnspath. Body of four segments, tail of six, terminated by two short 



lobes, from which issue two long seUe, fully the length of the body. Superior an- 

 tenna; of about six articulations, stronger than inferior pair. In the male there 

 is a bulla about fifth articulation. In the female they are more slender, more se- 

 tiferous, and destitute of bulUe. Inferior antenna? of three or four articulations ; 



