STATE GEOLOGIST. 109 



Lynceus sp.? 



Another member of the genus differing from any description met with is shown 

 in plate XYI. It is the smallest form seen, not exceeding .02 in. The feet are 

 proportionally large, as is the eye; while the antennae are quite small. 



FAMILY Bosminidse. 



This family has been removed, by Prof. Dana, (justly it would seem tons) 

 from Dahpnidoe. The general appearance is unique, and the characteristics of 

 the superior antennae places the only member in the single genus composing this 

 family at quite a distance irom Daphnia and its allies. 



Characteristics. — Foliaceous feet, ten in number; anterior antennae elongate and 

 many-articulate. 



GENUS Bosmina. 



Bibliography . — Daphnia, M. Edwards. 



Desmarest. 



Baird. 



Monoculus, Jurine. 

 Lynceus, Midler. 



Latreille. 



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

 Nat. Hist. VI., 412. 

 Note. (Name) — "Bosmina," a daughter of Fingal. 

 Generic characters. — Superior antennae long, curved, cylindrical, consisting of 

 many small articulations, and projecting from the extremity of 

 the beak; inferior antennae small as compared with size of the 

 body. 



Bosmina longirostris. 



Bihliographtj . — Lynceus longirostris, Muller, Zool. Dan. Prod., No. 2394; Ento- 



most., 76. 



Latreille, Hist. Nat. Crust. IV., 206. 



Fabricius, Ent. Syst., ii., 499. 



Monoculus comutus, Jurine, Hist. Nat. Monoc, 

 Daphnia cornuta, Desmorest, Cons. Gen. Crust. 



Baird, Ann. Mag. Nat. Hist, ii., 257. 



M. Edward, Hist. Nat. Crust., lii., 382. 



Bosmina cornuta, Baird, Trans. Berw. Nat. Club. 

 Eunica longirostris, Koch, Deutsch Crust., hi XXXV. t. 23. 

 Description. — General form varying from nearly square to an-irregular pear 

 shape (the large portion anterior); carapace terminated on the lower posterior 

 margin by short, curved spines. Head of moderate size, eye large, superior an- 

 tennae long, projecting from the beak, consisting of many articulations, the sev- 

 enth joints furnished with setae. Inferior antennae small. Ova few. 



The length of this animal is less than .02 in., which makes it a difficult matter 

 to clearly discover the structure of the organs. 



The superior antennae are nearly immovable, and being closely in juxtaposition, 

 give the appearance of a long, jointed beak or trunk. In fact the first idea 



