N0.1347. FRESH-WATER OSTRACODA-SIIARPR .,7^ 



It is yet too soon to hazard any remarks regarding geographical di^- 

 trihution in America, as too little is known of the range of individual 

 forms. 



The following table will, however, show the relative ahundan.v ..f 

 the museum forms at the time and place of collection: 



SUMMARY OF SPECIES OF FRESH-WATER OSTRACODA OF Till' 

 NATIONAL MUSEUM. 

 1. Family CYPRIDID^. 



(n) Subfamily Cypridin.w. 



1. Genus t'ypris. 



(rt) Subgenus Cypris. 



1. C. wrens, Guanajuato, Mexico, April (few). 



2. C. pubera Jurine, Oregon (almndant). 



3. C. pelludda Sharpe, Guauajuato, Mexiro, April (abundant). 



Big Butte, Idaho, Sejitoniljer (abundant). 



2. Genus /Spirocypris, new genus. 



4. ,S. passaica, new species (few). 

 (/') Subfamily Herpetocypridin.t:. 



3. Genus Herpetocypris. 



5. H. reptans Baird, California, September falnmdant). 



4. Genus CMamydothecu. , 



6. C. mexicana, new species, Mexico, September (abundant). 



7. C. azteca Saussure, Texas, October (conunon). 

 (c) Subfamily Cypridopsin.e. 



5. Genus Potattiucypris. 



8. P. smarar/dina (Vavra), Mexico, April (few). 

 ((/) Subfamily Cyclocypridix.e. 



6. Genus Cypria. 



9. C. exsctdpta Fischer, Michigan, November (cdinmun). 



SY'NOPTICAL KEY TO THE SUBFAMILIES, GENERA, ANO SUBGENERA OF THE FHKSH-\V ATER 

 OSTRACODA, INCLUDED IN THE FAMILY CYPKIDID.E. 



Family Cy'pridid.e. 



a Natatory set;e commonly reaching beyond end claws. Second feet usually with 

 three terminal sette of different lengths, two backwardly directed and the mid- 

 dle one sometimes claw-like. First maxillary process usually armed with 6 



strong spines Subfamily Notodro.madin.k, I. 



h Second antennae ff-segmented in both sexes, 

 c Second feet normal. Terminal seta of caudal ramus missing. Branchial 



plate on second maxilla of 2 setae Xotodromcut, 1 . 



cc Second feet with a claw on end segment. Furca normal, but terminal seta 



small or missing in female. No branchial plate Neu-hamia, 2. 



bb Second antennje 5-segmented in both sexes. Branchial plate present. 

 c Two terminal claws of ramus, seta-like. Second foot with a daw-like seta. 



Ci/iirnis, 3. 



aa Natatory set:^ shortened; no swimmers. Second foot with a beak-shaped end 



segment and a short claw Subfamily IIerpctocypiudix.k, II. 



b Furca ending in 3 claws; dorsal seta replaced by a short spine. Males 



unknown Ib/odromm, 4. 



bb Furca normal. 



c Second segment of first foot with 2 set;e on anterior margin. Three spines 

 on first maxillary process, the first one commonly toothed. 



C/dami/dothrca, 5. 



