BOSMINA. 
105 
Genus 4 — Bosmina.* 
Daphnia, M. Edwards, Desmarest , Baird. 
Monoculus, Jurine. 
Lynceus, Muller, Latreille. 
Bosmina, Baird, Trans. Berw. Nat. Club, 1845 ; Ann. Mag. Nat. 
Hist., xi, 412. 
Character . — Superior antennae 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 longirostris, Muller, Zool. Dan. Prod., No. 2894 ; Ento- 
most, 76, t. 10, f. 7, 8. 
— Latreille, Hist. Nat. Crust., iv, 206. 
— Eabricius, Ent. Syst., ii, 499. 
Monoculus cornutus, Jurine, 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 cornuta, Baird, Trans. Berw. Nat. Club, ii, 149. 
Bosmina longirostris, 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 setae 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 Eingal. 
f As the terms Eunice and Eunicae 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. 
