BOSMINA. 105 



Genus 4 — Bosmina.* 



Daphnia, M. Edwards, Desmarest, Baird. 

 MoNOCULUS, Jurine. 

 Lyncetjs, Miiller, Zatreille. 



Bosmina, Baird, Trans. Berw. Nat. Club, 1845 ; Anu. Mag. Nat. 

 Hist., xi, 412. 



Character. — Superior antennas long, curved, cylindrical, 

 consisting of many small articulations, and projecting 

 from the extremity of the beak. Inferior antennae small 

 compared with preceding genera. 



1. Bosmina longirostris. Tab. XV, fig. 3. 



Lynceus longikostbis, Miiller, Zool. Dan. Prod., No. 2394 ; Ento- 

 most., 76, t. ]0, f. 7,8. 



— Latreille, Hist. Nat. Crust., iv, 206. 



— Fabricius, Ent. Syst., ii, 499. 

 MoNOCULUS coiiNUTUs, Jurlne, Hist. Nat. Monoc, 142, 1. 14, f. 8-10. 

 Daphnia cornuta, Desmarest, Cons. gen. Crust., 375. 



— Baird, Ann. Mag. Nat. Hist., ii, 257, t. 9, f. 15. 



— M. Edwards, Hist. Nat. Crust., iii, 382. 

 Bosmina coknuta, Baird, Trans. Berw. Nat. Club, ii, 149. 

 Bosmina longikostris, Baird, Ann. Mag. Nat. Hist., xvii, 412. 

 EuNicAf longirostris, Koch, Deutsch. Crust., h. xxxv, t. 23. 



This animal is very small. The shell or carapace is 

 rounded on the posterior margin, bulging out anteriorly, 

 and terminating at the inferior angle in a sharp point or 

 spine, which projects straight downwards. The superior 

 antennae consist of twenty articulations ; the first seven 

 are short and close to each other ; at the seventh two or 

 three setas spring, projecting forwards and upwards ; 

 then follow thirteen articulations, each one longer than 

 the preceding. It requires a strong magnifying power 



* " Bosmina," a daughter of Fingal. 



f As the terms Eunice and ErjNiCAE have been already used in zoology, 

 and as this genus is not characterised by Koch, I have preferred retaining 

 the name I applied to it in 1845. 



