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 manuer, 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. 
newberryt, in the torm of the long cultriform 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 River debouches into the plains. 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 dukianus Day (Proe. Zool. See. London, p. 392, 1880) differs from 
A.himalayanus in the shorter carapace and much longer abdomen, which 
has 24 segments beyond the hinder end of the carapace, while in hima- 
layanus there are 17. In the Himalayan species, also, the 5th and Gth 
endites of the 1st pair of legs are much longer and the caudal append- 
ages are much longer. A. dukianus was discovered by Dr. Duke in 
Afghanistan, in a pond near Kelat, in April, 1877. 
Family BRANCHIPODIDZ Baird. 
Branchipoda Leach, Dict. des Se. Nat. xiv. 1816. 
Branchipiens Milne-Edwards, Hist. Nat. des Crust. ili, 364, 1840. 
Branchipuside Baird Vrans. Berwick Nat. Club, 1245. 
Branchipodide Fischer. Middendort’s Reise, ii, 149, 1851. 
Branchipodide Baird, Proc. Zod). Soc. London, 1852. Ann. and Mag. Nat. Hist. XIV, 
216, 1854. 
Branchipide Burmeister, Organiz. of Trilobites, Roy. Soc. edit. 34. 
Branchipide Verrill, Proc. Amer. Assoc. Ad. Se. July, 1870. 
Branchipodide Packard, Report of Hayden’s U.S. Geol. Surv. Terr. for 1873, 620. 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; Ist antenne filiform; 2d antenne stout in 
the males, forming claspiug 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 thefemale. A 
specialized abdomen, with 8 to 9 segments not bearing appendages. 
Terminal seement bearing a pair of filamental not-jointed setose append- 
ages. Larva a nauplius. 
Subfamily 1. BRANCHIPODIN A Packard. 
Eleven pairs (in Polyartervia 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. No frontal appendages. 
Abdomen with eight segments; male claspers with 2d joint flat, trian- 
gular; ovisac short ......-..----..--- area Lae Se a alrvemerey 
