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



Daphina cephalata Schoedler is named from rude drawings 

 by King, which, if they show anything, seem to prove that they rep- 

 resent an abnormality, probably of D. kingii. The sac like disten- 

 sion of the head is at the expense of the lower part of the head. 



Daphnia macrnra Dana is identified by Schoedler with D. carinata 

 King. 



Daplmia JcisilJcumensis Schoedler^!). vitrea Uljanin is apparently D. 

 longiremis Sars. 



Daphnia neuportii Baird, from India, is quite insufficiently de- 

 scribed but belongs to the D. schcefferi group. 



Schoedler mentions Daphnia brasiliensis Lubbock and Daphnia gran- 

 aria Gay, from Chili. 



Halderaann's Daphnia reticulata may be D. pulex and his Daphnia 

 ahrupta is Simocephalus, 



Daphnia luiuholtzii Sars. 



Plate LXVI, Fig. 6. 



This species from Australia is well characterized by acute depressed 

 frontal spine and the flaring fornices which end in curved spines of 

 considerable length. The male and ephippial female lack the frontal 

 spine but preserve the long spine springing from the upper angle. 

 Theantennules of the males are very long and the flagellum two-jointed 

 and about as long as the antennule. The claw of the first foot is 

 greatly developed. The claws have no spines. The anal teeth are 

 12 or more. Abdominal processes discrete. 



FAMILY BOSMINID^. 



Small cladocera of remarkable form, due to the great elongation 

 and modification of the antennules, which are seated on a small con- 

 ical beak-like projection of the ventral aspect of the head and form 

 long, jointed, probosis-like appendages curved in various ways. The 

 shell is laterally compressed and not sharply separated from the 

 body. There is frequently a sharp spine at the caudo ventral angles 

 of the shell. The surface is reticulate, striate or smooth. Feet, six 

 pairs. The first pair hooked in the male. The antennae have three 

 and four-jointed rami and are very small. The post-abdomen is trun- 

 cate and the claw is seated on a considerable prominence. Macula 

 cerebri and ccEca absent. 



As there is but the single genus \_Bosmina'] we have included gen- 

 eric characters. 



