202 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



further cephalad, i.e., over the base of the antennse rather imraedi- 

 ately in front of the heart. The beak in D. dentifera does not tura 

 ventrad but caudad. 



*Daphnia dentifera Forbes. 



Plate LLII, Fig. 9. 



Forbes '93. 



Broadly oval, long beaked, species with a large eye, posterior 

 spine high and with a prominent angle dorsally between heart and 

 eye in the male and young female. Head broadly rounded, eye near 

 front margin. Fornices short, forming a prominent angle behind the 

 base of the antennae. Lower margin of head concave, beak projecting. 

 Eye large with numerous lenses, its diameter more than half the dis- 

 tance from eye to beak. Pigment fleck immediately behind the eye 

 and nearer it than the posterior margin of the head. Head crested, 

 forming above the insertion of the antennce a rectangular process 

 which in the young may bear two or three teeth. This process is re- 

 duced to an obtuse angle in the adult female, disappearing in e])hip" 

 pial individuals entirely. Spine of shell long and slender, one third 

 or one- fourth the length of the shell. Caudal claws smooth, anal 

 spines 13. The two abdominal processes approximate. Length 

 of female 1.8 mm. Male 1.0 mm. Very near if not identical with 

 i). dentata Matile. This species differs from D. mimiehaha chiefly in. 

 having smooth claws. 



Daphnia loug-ireniis Sars. 



A species of moderate size and very hyaline. Head small and 

 rounded, ventral margin somewhat concave, beak sharp, directed 

 ventrad. Shell oval, spine short, straight, inclined dorsad. Autennse 

 relatively long, extending to caudal margin of shell. Post abdomen 

 similar to that of i>. longispma. Macula absent. Eye small. Length 

 1,0 mm. Apparently a pelagic form. We are not certain that ife 

 represents an adult, 



* Daphnia niag^niceps Herrick. 



The peculiar form figured in the tenth annual report of this survey 

 seems indubitably new and is distinguished by the peculiar shovel- 

 shaped head, which is scarcely crested but is broadest beyond the mid- 

 dle. The spine is long, the claws smooth, the abdominal processes- 

 united and the shell transparent. The eye is near the end of the 

 rounded head and is large; the pigment fleck was apparently absent. 

 Found with Daphnia minnehaha in a shallow swampy pool in autumn. 



