328 GEOLOGICAL SURVEY OF THE TERRITORIES. 



This species belongs to the third division of the genus, of which the 

 European cancriformis is a type, having the small eyes, and small post- 

 ocular tubercle, while the telson is marked in the same manner, and 

 the caudal appendages are finely spinulose, or hairy, as in no American 

 species. The 2d pair of feet are, however, very much like those of A. 

 newberryij in the form of the long cultriforra scale, or 6th endite, and in 

 the form of the gill and its flabellum, as well as the size of the carapace. 



"Collected from a stagnant pool in a jungle, four days after a shower 

 of rain had fallen. For five months previous to this rain there had been 

 no rain upon the earth. Himalaya Mountains, North India, near where 

 the Sutlege Eiver debouches into the ])lains. April, 1870." Museum of 

 Comparative Zoology, Cambridge. This is, evidently, a high- plateau 

 species, and a member of the Central Asiatic rather than Oriental 

 fauna. 



Apus duldanus Day (Proc. Zool. Soc. London, p. 392, 1880) differs from 

 AJiimalayanus in the shorter carapace and much longer abdomen, which 

 has 24 segments beyond the hinder end of tbe carapace, while in hima- 

 layanus there are 17. In the Himalayan species, also, the oth and Gth 

 endites of the 1st pair of legs are much longer anct the caudal append- 

 ages are much longer. A. duJdanus was discovered by Dr. Duke in 

 Afghanistan, in a pond near Kelat, in April, 1877. 



Family BRANCHIPODID^ Baird. 



BrancMpoda Leach, Diet, des Sc. Nat. xiv. 1816. 



BranGhipiens Milne-Edwards, Hist. Nat. des Crust, iii, 364, 1840. 



BrancMpuaidfM'BsiS^dL. Traus. Berwick Nat. Club, 184.5. 



Branchijjodidw Fischer. Middendorf's Reise, ii, 149, 1851. 



Branchipodidce Baird, Pxoc. Zool. Soc. London, 1852. Ann. and Mag. Nat. Hisf. XIV, 



216, 1854. 

 Branehipidm 'QnrvaiAstidv, Organiz. of Trilohites, Roy. Soc. edit. 34. 

 BrancMpidce Vorrill, Proc. Amer Assoc. Ad. Sc. July, 1870. 



Branchipodidce Pacliard. Report of Haydeu's U. S. Geol. Surv. Terr, for 1873, 6^0. 1874. 

 Gerstaecker, Bronn's Class, u Ord. Thierreichs, V, 1034. 1866-'79. 



Body soft, delicate, without a carapace; head small; the eyes stalked; 

 a distinct median ocellus ; 1st antennae filiform ; 2d antennae stout in 

 the males, forming clasping organs; frontal appendages often present; 

 11 pairs of feet (19 in Polyartemia), which are without a gnathobase 

 or coxal lobe; the other lobes (endites), especially the 5th and 6th, 

 broad and foliaceous, with a gill and simple rounded flabellum. First 

 and 2d uromeres with a penis in the male or an ovisac in the female. A 

 specialized abdomen, with 8 to 9 segments not bearing appendages. 

 Terminal segment bearing a pair of filamental not-jointed setose append- 

 ages. Larva a nauplius. 



Subfamily 1. BRANCHIPODIN.^ Packard. 



Eleven pairs (in Polyartemia 19) of feet, with the outer endites mod- 

 erately broad. Abdomen slender, cylindrical; terminal abdominal seg- 

 ment with two filamental setose caudal appendages. 



Synopsis of the genera. 



a. ISTo frontal appendages. 

 Abdomen with eight segments ; male claspers with 2d joint flat, trian- 

 gular ; ovisac short Artemia 



