980 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Torniinal claw stout, slio'htly bout, about one-half as long- as the I'urca. 

 Subterininal claw as long- as terminal seta, which is slightly more than 

 one-half length of terminal claw. Dorsal seta slender, about twice as 

 long' as Avidth of furca and situated about one-fourth width of furca 

 from subterminal claw. 



This species is characterized hy the shape of its shell, long termi- 

 nal claw of second foot, and the ti\'e combs of teeth on the dorsal edge 

 of the furca. While the specimens examined by me were somewhat 

 smaller than the European forms as described by Vavra and Kauf- 

 mann, 3'et they retain the same relative proportions. The Pairopean 

 forms of this species var}- within quite wide limits, hence the variation 

 of the American form as regards size is not at all surprising. 



The specimens studied liy me were obtained in part from Ensenada, 

 Lower California, and from Oakland, California, and are now in the 

 collection of the U. S. National Museum. Those from Ensenada were 

 collected by Mr. C. R. Orcutt and received l)y the Museum October 

 18, 1885), Accession No. 22-156. Those from Oakland were collected 

 by Dr. R. E. C. Stearns, Cat. No. 12221. 



This species occurs in England, Scotland, Ireland, Sweden, Nor- 

 way, France, German}', Switzerland, Sicily, Lower California, and 

 California. 



It has not heretofore been reported from America. 



7. MICROCYPRIS Kaufmann, 1900. 



Microcyprix Kaufmann, Xeue Ostrae. au8 dei" Schweiz, Zori]. Anz., XXIII, 1900, 

 p. 32. 



Natatory sette, very short. Spines of iirst maxilhe, toothed. First 

 foot with l)ut one seta on its tirst segment. Small Ostracods, 1.0(» mm. 

 or less in length. 



Kaufmann has established this genus to receive those forms ditier- 

 ing from TIerpefocyprh in number of seta? on basal segment of tirst 

 foot. I have added the genus character as to size. 



No American forms known. 



8. PRIONOCYPRIS Brady and Norman, 1896. 



Erpt'tocypris Brady and Norman, A monog. of the luarine and fresli-water ( )stra- 



coda. Sec. I, Trans. Royal Dublin Soc, 1889, p. 87. 

 I'rionocyjms Brady and Norman, A monog. of the marine and fresli-vvater Os-^tra- 



coda, Pt. 2, Tran8. Royal DubUn Soc, V, 1896, p. 724.— Kaufmann, C\]>- 



riden mid Darwinuliden der Schweiz, Revue Suisse de Zool., YIII, 1900, 



p. 292. 



Natatory seta?, short. Spines of tirst maxilhe, not toothed. Length, 

 from 0.9 mm. to 1.6 mm. 



This genus seems not to be well distinguished from Ilrrj^rfoci/j/ns, 

 except by means of the two maxillary spines and smaller size. No 

 American fomis known. Erpetocyprk serrata Brady and Norman, 

 1889, page 87, used as the type form. 



