368 GEOLOGICAL SURVEY OF THE TEKRITOEIES. 



THE CALIFOKNIAN OR PACIFIC PROVINCE. 



But one species, Usfheria californica, (unless U. netccomhii be regarded 

 as distinct) inhabits this area, which is separated by the Cascade Mount- 

 ains and the Sierra jJsTevada from the Central province, and extends from. 

 52° north southward to San Diego. 



Ifo species is as yet known from Central America; and the two 

 Mexican forms occur in elevated regions in Northern Mexico, and are 

 not peculiar to Mexico, being characteristic of the Central province of 

 the United States. 



THE ANTILLEAN PROVINCE. 



The species inhabiting the West Indies are comprised in the following 

 brief list : 



EstJieria jonesii. Apus guildingii. 



JEJulimnadia antillarum. , Artemia guildingii. 



Apus domingensis. Streptocephalus similis. 



SPECIES COMMON TO THE ATLANTIC AND CENTRAL PROVINCES. 



Estlieria mexicana ranges from Ohio to Lake Winnepeg, northward, 

 and westward to Western Colorado, and into Northern Mexico. 



Artemia gracilis ranges from Salem, Mass., to Mono Lake, in California, 

 but the life-conditions of this brine-inhabiting genus are so exceptional 

 that we have not mentioned it in the foregoing lists. Our only truly Al- 

 pine form is Branckinecta coloradensis, found at an elevation of 12,000 

 feet in Colorado. 



SPECIES INHABITING SOUTH AMERICA {Brazilian Region). 



Estlieria hrasiliensis Baird. Brazil. 



Estlieria dallasii Baird f Brazil. * 



SPECIES INHABITING THE EUROPJEO-ASIATIC REGION. 



a. — The European Province, 

 1. Western Europe. 



Limnetis hracliyurus. Germany. 

 Estlieria cycladoides. Toulouse. 

 Limnadia hermanni. France and Germany. 



gigas. Central and Northern Europe. 

 tetracera. Germany. 

 Brancliipus stagnalis.* England and Central Europe. 



grubei. Central Europe. 

 Artemia salina. England and Europe. 

 Chirocephalus diaphamis. England, France, Switzerland. 

 Lepidurus productus. England and Central Europe. 

 Apus cancriformis. Central Europe. 

 grubei. Germany. 

 lubbocliii. Germany. 



* Branchipus lacunce Gu^rin, Baird, Grube ; and B. Iraueri Frauenfeld, are regarded 

 by Lilljeborg (Nov. Acta Upsala (3), ix, A, p. 3) as synonyms of B. stagnalis. 



