336 GEOLOGICAL SUEVEY OF THE TEREITOEIES. 



Branchinecta paludosa (Miiller). 



Plate IX, figs. 1-6 ; PI. X, figs. 1-5. 



Cancel- staqnalis O. Fabr., Fauna Groen. (non Linn, et Miill. Prodr.), 247, 1780. 

 Cancer paiudosus Herbst, Naturgeschichte der Krabben. Bd. II, p. 118. 

 Branchipus palwdosus, Miiller, Zool. Danica, ii, 10, PL 48, figs. 1-8, 1788-1806. 

 Branchiiriis paludoHus ^einhaxiit, Bidrag til eu Beskrivclse af Groenlaud, 18.57; Pack- 



arcl, Glacial Phenomena of Maine and Labrador, etc. Memoirs Boston Soc. 



Nat. Hist, i, 295, 1867. 



Branchipiis (Branchinecta) groenlandicus Verrill, Amer. Jour. So. 2d ser. xlviii,' 253, 



Sept. 1869. 

 Branchinecta groenlandica Verrill, Proc. Amer. Assoc. Adv. Sc, July, 1870. 

 Branchinecta paiudosus Verrill in part (B. arctica regarded as distinct). 

 BrancMpus middendorjianus Fiscber,* Middendorff's Sibiriscbe Eeisen. Bd. II, p. 153. 



Body moderately large. Male claspers mucli shorter and slighter than 

 in jB. color adensis^ 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 B. coloradensis) ; the distal half of the inner edge with a row 

 of fine teeth, the points ending in fine setse. 2d joint *ery slender, 

 narrowing gradually to the tip, which is one-half as wide and not bent 

 in or slightly expanded as in B. eoloradensis ; 2d antennae 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 setse, 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 j)ointed 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, 1"™. 



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, 

 IS'orthern Greenland, August 1, 1872.* 



On carefully re-examining, after the lapse of over fifteen years, a por- 

 tion of the material originally collected at Labrador, and comparing a 

 male and three temales (labeled Br. arctica 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. paiudosus. There 

 are the same ijroportions 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 joint 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 x)rong-like process projecting 



* Considered by Grube and also DybowsM as a synonym of B. paiudosus. See 

 Arcbiv fiir NaturgescMcbte, XXVI, i, p. 201. 



* I have been kindly permitted by Dr. Bessels to use this material in this connection, 

 and also the excellent drawiligs by Mr. Emerton, which were made originally for a 

 report on the Natural History of the P.olaris Expedition. 



