DR BAIRD ON ENTOMOSTRACA. 147 



FAMILY 3.— BRANCHIPURID^. 



Body not enclosed within, or covered by, a carapace of any kind. 

 Antennae, two pairs, the inferior pair being prehensile. Eyes two, 

 pedunculated. Feet, eleven pairs, all branchial. 



Genus 1st. — Branchipus, ScJuBffer* Body elongated, almost 

 filiform. Abdomen very large, composed of nine articulations, 

 the last bilobed and terminated by two large well developed plates, 

 forming a tail. At the base of the prehensile or second pair of 

 antenncE, there are setaceous appendages in form like the superior 

 antennse. 



Sp. 1st. — Branchipus stagnalis, Latr.^ Cancer Stagnalis, 

 2/tnn. Branchiopoda stagnalis, Lamk. Branchipus Schaeflferi, 

 Thompson. 



Genus 2d. — Artemia, Leach. Last articulation of abdomen 

 simply two-lobed, and destitute of the two large plates. No seta- 

 ceous appendages at the base of the prehensile antennae. 



Sp. 1st. — ^Artemia salina, Leach.X Cancer salinus, Linn. 

 Gammarus salinus, Fahr. Artemisus salinus, Lamk. 



No species of any of the genera of the above mentioned families 

 have as yet, I believe, been noticed within the limits of this Club ; 

 but I have little doubt that some of them will be found here- 

 after. 



Order 2.— LOPHYROPODA— Latreille. 

 Feet not numerous, and not exceeding ten in number, with more 

 or less cylindrical joints. Branchiae not numerous. Generally 

 speaking, only one eye. Most of them have two pairs of antennae, 

 the inferior of which are used, in most of the genera, as organs of 

 motion. Many of them have a palpus attached to the mandible. 



Sectum 1»<.— CLADOCEERA— Latr. 

 Body, except the head, which is distinct and projecting, entirely 

 enclosed within a covering of two pieces joined together on the 

 back, and divided within this envelope into rings, not very dis- 

 tinct. No foot jaws. Inferior antennae branched, large and per- 

 forming functions of swimming organs. Feet more or less foliated, 

 and generally four or five pairs. No external ovary. 



* Element. Entomol. t Hist. Nat. des Crust., &c., iv., 299. 



t Diet, des Scien. Nat.> xiv., 543. 



