Phyllopod Crustacea. 339 



3'5. Body flesh-colour or pale red, the intestine darker red or 

 greenish. 



A large male gives the following measurements : — 



Length of first joint of claspers 4-62 millims., diameter 2*40; 

 length of second joint 4*14, breadth at base 1'90, at tooth "72, 

 in middle -52 ; length of tooth '90, its diameter -33 ; length 

 of caudal appendages 4, breadth at base "33, in middle '20 ; 

 length of setee 2 ; length of antennse 3. 



New Haven, in stagnant pools (J. D. Dana, D. C. Eaton, 

 A. E. Verrill) ; Salem, Mass., April 19, 1859 (R. H. Wheat- 

 land, C. Cook, from Essex Institute) : Cambridge, Mass. 

 (A. E. Verrill). 



This species differs widely from all the described species of 

 Europe in the character of the claspers of the male and their 

 appendages. B. stagnalis has a pair of long setiform organs 

 between the claspers, and a tooth on the outer side of their 

 second joint ; B. sjnnosus resembles our species somewhat in 

 the frontal appendages between the claspers, but lacks the 

 conspicuous tooth at the base of the second joint of the latter. 

 The shape of the egg-pouch in our species is also cliaracteristic. 



This is doubtless the species referred to by Dr. Grould under 

 the name oi BrancMpus stagnalis'^. Dekayt copies the dia- 

 gnosis of B. stagnalis (?) from a foreign work, and gives a 

 figure of Ghiroceplialus diaphanuSj copied apparently from 

 Desmarest, pi. 56, which is itself a copy. 



This species appears very early in spring, often in great 

 numbers, in quiet pools. I have never seen it later than the 

 middle of May ; yet, since the individuals seen in early spring- 

 are full-grown, it might, doubtless, be found also in autumn. 



BrancMpus [Branchinecta) arcticus^ Verrill, sp. nov. 



Branchipus paludosus, Packard, Invertebrate Fauna of Labrador, in 

 Mem. Boston Soc. Nat. Hist. i. p. 295 (non Miiller). 



Form slender, body short, abdomen elongated. A full-sized 

 male is 20 millims. ('79 inch) long, exclusive of the claspers, 

 the abdomen being 13 millims., the breadth between the eyes 

 3 millims. A female, 20 millims. long, with the abdomen 

 12 millims., has an egg-pouch 6'2 long. Branchial " feet " 

 slender, elongated, the middle ones longest, 4-5 millims. long 

 when extended. Claspers of the male rather long and slender; 

 the basal joint is but little swollen, elongated, regularly curved, 

 with a small tooth or prominent angle at the articulation on 

 the inside, and on the inner side a row of numerous small, 



* Invertebrata of Massachusetts, p. 3.39. 



t Natural History of New York, Zoology, Part I. Crustacea, p. 63, 

 pi. 9. fig. 36. 



