a Ph es a AM he ie SU eye ee, Ty, SS ; = ss 
ENTOMOSTRACA OF MINNESOTA. 209 
Bosmina ecurvirostris Fischer. 
Body rounded, length little greater than height, front somewhat 
protuberant, dorsal margin strongly arched, antennules short and 
strongly curved. Flagellum midway between eye and end of beak. 
Seven to eight sete upon the cephalic aspect of antenne. Length 0.39 
to 0.4 mm. 
* Bosmina striata Herrick. 
PLATE LXV, Fie. 1. 
Herrick ’82. 
This form is very imperfectly known, but resembles B. bohemica 
and may be identical, but that is a much larger form. Oblong, slen- 
der, greatest height cephalad of middle, front strongly arched. Hye 
large. Flagellum near the beak. Antennules very long, curved. 
Shell irregularly marked with anastomosing longitudinal lines pro- 
ducing a deformed reticulation. Spine large, curved, but not long. 
Ventral margin sinuous, ciliated cepbalad. Length 0.25 mm. 
* Bosmina atlantaensis Turner. 
This is not adequately described. It, however, affords proof of the 
existence of a fourth typeof Bosmina in America. JB. longirostris, B. 
cornuta and B. striata all have the shell marked and peculiarities 
of structure otherwise. The southern form has a smooth shell, long 
antennules, depressed spine, sinus between head and body, and fla- 
gellum nearer to the eye than to the sensory sete. The post-abdomen 
is broad and the claws toothed. The whole genus requires revision. 
Other species which cannot now be placed are the following: 
. gibbera and B. rotunda Schoedler. 
. levis Leydig, probably the young of longirostris, 
. londensis Norman and Brady. 
. obtusirostris Sars, probably is B. brevirostris. 
. lacustris and B. nitida Sars. 
. coregoni Norman and Brady, is B. lilljeborgit. 
. macrorhyncha, a species from the Nile. 
Bo bbood 
FAMILY LYNCODAPHNID Sars ’61; Herrick ’81. 
This is a rather small family with several genera of minute animals 
which are abundant only insummer. Many, and indeed most, of the 
species are among the rarer of fresh water crustaceans of this group, 
and a few are among the rarities which only now and then reward the 
