PACKARD.] PHYLLOPODS OF NORTH AMEEICA. 337 



inward near tlie base of each branch or fork. The caudal stylets are a 

 little longer than in the Greenland examples, but this is probably due 

 to the more mature development of the specimens. 



Length of male, 19"""; length of claspers, 5'"""; length of 2d joint, 2"'"'. 



Length of cercopoda or caudal appendages, 1.5""". 



Length of female, 18""^; length' of ovisac, 5"™. 



Although predisposed to think that Professor Verrill* had found good 

 reasons for separating- the Labrador from the Greenland individuals under 

 a distinct specific name, though I originally had examples of the Green- 

 land B.paludosus from Dr. Liitken, of the Copenhagen Museum, for 

 comparison, I have carefully re examined them for any specific charac- 

 ters that I might have overlooked. 1 see no dili'erences in the ap})end- 

 ages, the 5th and 6th endites especially not differing in any essential 

 point, as will be seen by the numerous figures on Plates IX and X, 

 the apparent discrepancies in the drawings being due to different 

 'stages of preservation. There is a slight dilierence in the tips of the 

 male claspers, which are a little blunter in the Labrador than in the 

 Greenland examples, but this may be on account of the smaller size and 

 less degree of maturity of the Greenland examples. I have not at hand 

 the larger Greenland examples originally received from Greenland 

 through Mr. Liitken. The Labrador examples were taken August 7, 

 1864, in a small pool of water in a depression in the rocks on a point of 

 land projecting into the water at "Indian Tickle,-' on the north side of 

 Hamilton or Invuctoke Inlet, Northern Greenland ; and others were seen 

 at Tub Island, on the south side of the entrance of the bay, August 10. 



We add the following account by Baird of what seems to be without 

 much doubt B. paludosus, and which shows that it inhabits Arctic 

 America in latitude 68° 15' N., longitude 113° 50', of Greenwich : 



"Some fragments of a species of Branchipoda were brought by Sir 

 John Eichardson from Cape Krusenstern, in North America, collected 

 there by Mr. John Eae in August, 1849, along with the Apus glacialis. 

 They consist of portions of two males and two females. The male an- 

 tennae are two-jointed ; the basal joint is thick, and has at its lower part, 

 near its junction with the second, a row of small teeth ; the second joint 

 is cylindrical and pointed. The female horns or antennae are flat, ap- 

 ])arently, and have a short hooked spine at the extremity. The caudal 

 fins are rather long, and fringed with long cilia. In some respects this 

 species resembles the figure of t\iQ Cancer paludosiis pi Muller, but the 

 fragments are too much decayed in the spirits to enable me further to 

 describe it. It does not appear to have either antenniform apijendages 

 or any apparatus attached to the antennae of the male. 



Should these three species prove to be distinct they may form an- 

 other genus of this family, characterized by the want of these append- 

 ages and the toothed or serrated basal joint of the male cephalic horns." 



Under the name of Branchipus {Branchinecta) arcticus, Mr. E. J. Miers 

 notices this species in the Annals and Mag. Nat. Hist., ser. 4, vol. xx, 

 p. 105, PI. IV, fig. 1. His figure is a very indifferent one, and he erro- 

 neously represents the ovisac as double. Discovery Bay is in latitude 81^ 

 41' N., longitude 64° 45' W. We reproduce his description and remarks : 



"Coll. Hart : Discovery Bay, in a small fresh-water lake and in a stream 

 under ice. Several specimens were "collected, including males and 

 females, of a species of PhyJlopoda, which I refer to the B. arctlcus of 

 Verrill. Of these species I have only seen the descriptions in the jour- 

 nals above quoted, not having been able to meet with Verrill's full re- 



* Prof. Verrill writes me that he has since (Ainer. Jour. Sc.) decided that his B, 

 groenlandica is identical with B. paludona. 



22 H 



