MKANCHIOPOIM. 245 



\vitli re.spect to it . hai.u tcrs, in order that they may be clearly defined. 

 According to Miiller we find in the 



CTTHBRE, Mull. CYTIIERINA Lam. 



Eight simple feet*, terminating in a point, arid 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 Confervas f. 



CYPRIS, Mull. 



Hut six feetj; 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. T lie intermediate antennae, inserted above, are shorter 

 than the body, setaceous, composed of from seven to eight joints, the 

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

 fifteen setae, serving as fins. The mouth consists of a carinated 

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

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

 leaf with five digitations , and two pairs of j.iws. 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 ||, silky at the end, 

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

 sternum fulfils the functions of a lower lip tf. 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 

 nuieh 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 arc but six. See Cypris, note J. 



f It thes eEntomostraca iuhabit salt-water exclusively, it is easy to see that Jurine 

 other observers whose geographical position limited their researches to the 

 i irnu-ra, could not have spoken of the former. Sec Mull., Entora., 

 Ci mi Ki., an.i IK-Miiar.. Consid., p. 387, 388, LV, 8. 



tr 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 tli- mandibh"* 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 bnt one joint 

 and tt -i -minute -d in a dentated spoon as so many feet. The latter does not include in 

 tlii- number those which the former considers as sexual organs; he states them 

 p. 161, 166 to be five jointed threads issuing laterally from the pouch of the 

 matrix, .t tin- use of which he is ignorant. 



Intnior lip. Itundokr. 



|| Forked in the f w 'tis tlriyutti, Id. 



Kuui-i lip, Id. 



