80 MODERN SYSTEM. 



iiien much narrower than the shell, on every side imbricated with 

 membranaceous, foliaceous lamella-, which surround or embrace 

 it : two of the kmelke are dorsal, the one being placed over the 

 other; the other lamella? arc placed on the sides of the belly, three 

 on each side; apex of the abdomen terminated by two very long iila- 

 ments, and with two shorter filaments below them : rostrum elongato- 

 cylindric, inserted behind the anterior legs, furnished at its extremity 

 with two straight corneous mandibles: /cgssix; anterior pair three- 

 jointed, the second joint near the apex above unidentate, the last ter- 

 minated by a claw; second pair triarticulated, the last joint ovate, 

 compressed; third pair biarticulate, the second joint very thick, in- 

 ternally dentated, armed at its extremity by a strong claw. 

 Sp. 1. Aruh. Smilhii. Leach, Encycl. Brit. Supp. vol. 1. Ft. 20 



This species was discovered sticking to a shark wliich was thrown 

 ashore on the coast of Exmouth, in Devon, by T. Smith, esq. 



Division II. — Body covered bj/ a bivalve shell: eyes sessile. 

 Subdivision 1 . — Head pon-ectcd. 

 Genus 5. DAPHNIA, Mull., Lair., Bosc, Leach. 



Jv/c one only: ««^7»?^i' two, branching. 



Sp. 1. Daph. Pulcx. Tail intlexed: .shell mucronate behind. 



Monoculus Pulex. Linne, Fabr. 



Inhabits ponds and marshes. 



Subdivision 2. — Head concealed. 

 Genus G. CYPRIS, Miill., Latr., Bosc, Leach, 

 ^nterma terminated by a brush. 



The animals of this genus inhabit pools and ditches containing 

 pure water; they s\\'im with very great rapidity, and whilst in mo- 

 tion conceal their whole body within their shell, Avhich is truly bi- 

 valve. 

 Sp. 1. Ci/p.concluicca. Shell ovate, tomentose. 

 JNIonoculus conchaceus. Linn., Fabr. Cypris pubera, Mali. Cypri.^ 



conchacea, Latr., Leach. 

 Inhabits France, Germany, and England. 



Genus 7. CYTIIERE, Mull., Latr., Bosc, Leach. 

 Antenna simply pilose. 



This genus was first discovered and established by Miiller, who 

 first obserx'cd all the species described in his Entomostraca. It is di- 

 siinguished from Cypris by the antenuce, which are not terminated by 

 a pencil of hairs. The legs are eight in number, and are rarely dra^m 

 within the shell, which is really bivalve. 



The Cythcres have no tail, and their antennae, like those of the Cy- 

 prides, have their articulations pilose. They have but one eye. All 

 the species inhabit the sea, and may be found among the conferva 



