340 GEOLOGICAL SURVEY OF THE TERRITORIES. 
duced. The caudal appendages are nearly twice as long as in B. colo- 
radensis. The eggs are nore numerous (about 50 contained in the ovisac) 
and much smaller than those of B. coloradensis, being about one-half as 
large. The feet are well developed; the 5th endite square and hol- 
lowed out a little on the outer edge; the 6th is long and more pointed 
than in the other species of Branchinecta; the gill is large, as is also 
the oval broad flabellum. : 
Male, length of body, 8™"; 2d antennz, 3™"; length of 2d joint, 13™"; 
caudal appendages, 1”. 
Female, length of body, 15"; ovisac, 4-5"; caudal appendages, 
ora 
This species differs remarkably, especially in the long caudal append- 
ages, and in the large pointed 6th endites of the feet. It may at 
once be distinguished from Branchinecta coloradensis by the shorter 2d 
antenne, the basal joint being one half shorter, and the 2d joint very 
short, while the inner projection or spur is much larger and more pointed 
than in B. coloradensis, and the caudal appendages are much larger, 
while the ovisac is much shorter than in that species. The eggs are of 
the same size as those of B. paludosus. 
The specimens occurred in a pool at Wallace, Kansas, in company 
with the other Phyllopods from that place. 
This species is named in honor of Prof. Joshua Lindahl, of Augustana 
College, Rock Island, Ill., who collected the specimens examined, with 
many other Phyllopods which he kindly lent me for study. 
Genus BRANCHIPUS Schaeffer (in part). 
Branchipus Schaeffer (in part), Elementa Entomologica, 1766 (type B. pisciformis=? B. 
stagnalis Ex. Verrill). lLatreille, Regne Animal; Leach. Milne-Edwards, 
Crustacés, iii, 364 (in part), 1840. 
Chirocephalus Dana (in part), non Bénédict-Prévost, 1803; Jurine, Thempson, Baird. 
Branchipus Verrill, Amer. Journ. Science, xviii, 250, Sept. 1869. 
Branchipes (and Hubranchipus) Verrill (in part), Proc. Amer. Assoc. Adv. S3., July, 
1870. 
Body large and very stout; head large; male claspers elbowed, large 
and thick, complex, varying much in form; Ist joint very stout and 
thick, nearly straight, with a stout inward-pointing spine at base; 2d 
joint varying in form, usually simple and straight, chitinous, bent a 
little at the tip. Head of male with a pair of frontal appendages hang- 
ing down between the male claspers and varying much in form, being 
long, slender, filiform, and simple (in B. stagnalis), forming two broad, 
flat triangular lobes with crenulated edges (in B. vernalis), or very large 
and deeply and finely lobulated (B. grubei). The 11 pairs of feet are 
much as in Branchinecta, but usually the 5th endites are larger and 
the edge less square than in Branchinecta, and the 6th endites are 
larger and more pointed. The penis is large and broad, in B. stagnalis 
quite deeply cleft, or (B. vernalis) only slightly so, the cirrus long and 
slender. Caudal appendages long and slender, nearly twice as long as 
is usually the case in Branchinecta (B. lindahli excepted). 
Female with the body long, the head large, caudal appendages as in 
the male, the ovisac broad and short, bottle-shaped, the opening trans- 
verse, at the end of a short neck. 
The type of this genus is Branchipus stagnalis (Linn.) of Europe, and 
in this country it is represented by B. vernalis. 
As limited by Milne-Edwards, the genus was too comprehensive, be- 
ing composed of three generic forms, simce he included in it B. spinosus 
