336 GEOLOGICAL SURVEY OF THE TERRITORIES. 
BRANCHINECTA PALUDOSA (Miiller). 
Plate IX, figs. 1-6; Pl. X, figs. 1-5. 
Cancer stagnalis O. Fabr., Fauna Groen. (non Linn. et Miill. Prodr.), 247, 1780. 
Cancer paludosus Herbst, "Natur geschichte der Krabben. Bd. II, p. 118. 
Branchipus paludosus, Miller, Zool. Danica, ii, 10, Pl. 48, figs. 1-8, 1783-1806. 
Branchipus paludosus Reinhardt, Bidrag tilen Beskrivelse af Groenland, 1857; Pack- 
ard, Glacial Phenomena of Maine and Labrador, etc. Memoirs: Boston Soc. 
Nat. Hist. i, 295, 1867. 
Branchipus (Branchinecta) groenlandicus Verrill, Amer. Jour. Sc. 2d ser. xlviii, 253, 
Sept. 1869. 
Branchinecta groenlandica Verrill, Proc. Amer. Assoc. Adv. Sc., July, 1870. 
Branchinecta paludosus Verrill in part (Bb. arctica regarded as distinct). 
Branchipus middendorfianus Fischer,* Middeudorft’s Sibirische Reisen. Bd. II, p. 153. 
Body moderately large. Male claspers much shorter and slighter than 
in B. coloradensis, not reaching far beyond the middle of the thorax, 
basal joint more bent than in the other species, but of the same propor- 
tionate length, though without any knobs (also absent in immature 
males of 3B. coloradensis); the distal half of the inner edge with a row 
of fine teeth, the points ending in fine sete. 2d joint very slender, 
narrowing gradually to the tip, which is one-half as wide and not bent 
in or slightly expanded as in B. coloradensis ; 2d antenne of the female 
narrow and slight, at the tip suddenly contracting and ending in a mu- 
cronate tip. 
The feet are short and broad; the 5th endites, straight on the outer 
edge, with the outer angle rectangular, while the 6th endites are short 
and broad; the sete, especially at the distal angle, are rather coarser 
and shorter than in B. coloradensis. 
Caudal appendages small, narrow, scarcely longer than the terminal 
joint. The ovisac is oval-cylindrical, rather long, the lobes pointed at 
the end; only one-half as long as the abdomen. 
Length of body of male, 15""; length of clasper, 4°"; 2d joint, 1.5 
cercopoda, en, 
Length of body of female, 12™"; of ovisac, 4™". 
The foregoing description was drawn up from an individual selected 
from a collection of about 80 made by Dr. Emil Bessels, at; Polaris Bay, 
Northern Greenland, August 1, 1872. 
On carefully re- examining _ after the lapse of over fifteen years, @ por- 
tion of the material originally collected at Labrador, and comparing a 
male and three females (labeled Br. aretica by Verrill) with the abundant 
material collected by Dr. Bessels, in Northern Greenland, I am unable 
to find any specific differences between them. The Greenland examples 
are smaller and less mature than the Labrador ones. I find that they 
possess the same characters as those which separate the species from 
B. coloradensis, and which occur in the Greenland B. paludosus. There 
are the same proportions in the male claspers, the knob-like processes 
on the basal joints are also wanting, the row of teeth on the distal half 
of the joint are of the same size. Owing to the greater size of the 
specimens the male claspers are a little larger, but the 2d jomt has the 
same proportions, being narrow, not widening at the tips, which also is 
not incurved. The ovisac is of the same length and form. ‘The penis 
is of the same form, and with a similar prong-like process projecting 
*Considered by Grube and also Dybowski as a synonym of B. paludosus. See 
Archiy fiir Naturgeschichte, XXVI, i, p. 201. 
*T have been kindly permitted by Dr. Bessels to use this material in this connection, 
and also the excellent drawings by Mr. Emerton, which were made originally for a 
report on the Natural History of the Polaris Expedition. 
