I3RANCHIOPODA. 245 



with respect to its characters, in order that they may be clearly defined. 

 According to Miiller we find in the 



Cythere, MiilL — Cythehina Lam. 



Eight simple feet *, terminating in a point, and two equally sim- 

 ple setaceous antennae, composed of five or six joints, furnished with 

 scattered hairs. They are found in the salt and brackish waters of 

 the sea-coast among the Fuci and Confervae f . 



Cypris. Miill. 



But six feet J; the two antennae terminated by a bundle of setae 

 resembling a pencil. 



The shell forms an oval, laterally compressed body, with an arcu- 

 ated and convex back, or towards the hinge ; the opposite side is 

 almost straight, or slightly emarginated or reniform. Before the 

 hinge and on the median line is the eye, forming a large, blackish, 

 round point. The intermediate antennae, inserted above, are shorter 

 than the l)ody, setaceous, composed of from seven to eight joints, the 

 last of which are shortest and terminated by a bundle of twelve or 

 fifteen setae, sei'ving as fins. The mouth consists of a carinated 

 labrum, two large dentated mandibles, each furnished with a triarti- 

 culated palpus, to the first segment of which adheres a small branchial 

 leaf with five digitations §, and two pairs of j ;ws. The two supe- 

 rior are much the largest, and have four moveable and silky appen- 

 dages on their internal margin, and a large, pectinated, branchial 

 lamina on their anterior edge; the second are composed of two joints, 

 with a short, nearly conical, inarticulated palpus H, silky at the end, 

 as is the extremity of the jaws themselves. A sort of compressed 

 sternum fulfils the functions of a lower lip^. The feet are divided 

 into five joints, the third representing the femur, and the last the 

 tarsus. The two anterior feet, inserted under the antennae, are 

 much shorter than the others, incline forwards, and are furnished 

 with rigid setae, or long hooks united in a bundle at the extremity 

 of the last joints. They are deficient in the four following feet. The 

 second, situated in the middle of the under part of the body and at 

 first directed backwards, are arcuated and terminated by a long and 

 strong hook inclining forwards. The two last are never visible ex- 



* It is probable there are but six. See Cypris, note J. 



•f- If thes eEntomostraca iuliabit salt-water exclusively, it is easy to see that Jurine 

 and other oliservers whose geographical position limited their researches to the 

 fresh-water genera, could not have spoken of the former. See Miill., Entom., 

 Cythere, andDesmar., Consid., p. 367, 386, LV, 8. 



X Four according to Randohr, and eight according to Jurine ; the first consider- 

 ing the two last as appendages of the males, and the second looking upon the palpi 

 of the mandibles and the branchial laminae of each upper jaw — the two first feet of 

 his second division of the body, those which he says are composed of but one joint 

 and terminated in a dentated spoon — as so many feet. The latter does not include in 

 this number those which the former considers as sexual organs ; he states them — 

 p. 161, IGC — to be five jointed threads issuing laterally from the pouch of the 

 matrix, of the use of which he is ignorant. 



§ Interior lip, Randohr. 



II Forked ki the Cypris strigata, Id, 



«; Exterior lip, Id. 



