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



abdomen not ciliate, of moderate size. Anal teeth 10, nearly equal. 

 Claws bipectinate. Abdominal processes discrete. Length 1.08 mm. 

 It still seems probable that this is an age form of some species with 

 longer spine. 



Daplinia alpiua Daday. 

 Da day '88. 



Head short, somewhat produced ventrad, front rounded, ventral 

 margin almost straight; beak rather acute, short, extending ventrad. 

 Eye large, rather remote from the margin of the head. Xo crest. 

 Shell almost round, ventral margin obviously rounded; spine absent 

 or very short, simply forming an acute angle. Post-abdomen small, 

 laterally setose, bearing 11 to 12 anal spines which are short and 

 curved and slightly diminish in size dorsad. Claw with a comb of 

 long teeth and a continuous series of fine spinules. Abdominal pro- 

 cesses discrete. Length 1.2 to 1.9 mm,, depth 0.9 to 1.15 mm. 



The resemblance to I), ohiusa Kurz is very close, but that species 

 has the sides of the post-abdomen smooth, the ventral margin of the 

 head concave and the spine near the middle of the caudal margin of 

 the shell. The shell is longer and more oval in outline. We should 

 wish to be very sure that these are not both old individuals of a spe. 

 cies having the usual spine in younger stages. 



Daplinia hastata Sars. 



A large species of reddish color, with strongly depressed head, 

 whose ventral margin is convex. Shell oval, with a long spine. The 

 abdominal processes are long and approximate. Anal spines 16. 

 Length 3.0 mm. This species was inadequately described by Sars 

 and probably should be dropped. 



Daphnia oruata Daday. 



Daday '84^ (serrulata); '88. 



Head nob separated by a depression from the thorax. Beak rather 

 acute, short, turned ventrad. Eye distant from the margin of the 

 head. Shell oval, margins rounded, with a moderate spine directed 

 caudad. Post-abdomen scarcely attenuated apically with eight to ten 

 curved anal spines, diminishing dorsad; sides setose. Claw with a 

 basal series of spines and a continuous series of fine seti^e. Abdominal 

 processes discrete, ciliate. Length 1.0 to 1.5 mm., height 0.85 to 1.0 

 mm. The ventral margin of the head in this species is more curved 

 than in D. alpma, and this might well be a younger form of !>. ohtusa, 

 though the sette on the sides of the abdomen are not noted in that 

 species. 



