Mr. E. J. Miers on Arctic Crustacea. 105 



In the specimens I have before me the teeth on the inferior mar- 

 gin of the palm of the second pair are not only much larger than 

 in j3^. echinata, but the palm itself is not tuberculated as in that 

 species, as figured by Boeck (?. c). It is possible that the two forms 

 are distinct ; but the variation in the spines of the body and its 

 limbs are known to be very great in some species of the genus. 



Probably the specimens referred by Ross in Parry's 3rd and 4th 

 Voyages to Caprella scolopendroides, and which he describes as 

 having " a great number of small spines along the back," should be 

 referred to ^. spinosissima. They were collected at Port Bowen 

 and Low Island, 



This species has been recorded from the coasts of Greenland, 

 Spitzbergen, and Norway ; and if, as I believe, the species of Stimp- 

 son is identical, from the Grand Manan at the entrance of the Bay 

 of Fundy. 



EXTOMOSTRACA v. GNATHOPODA. 



Phyllopoda. 

 Beaxchipodid^. 



Branchipus (Branchinecta) arcticus. PI. IV. fig. 1. 



Branchipus (Branchinecta) arcticus, Verrill, Amer. Joum. Sci. & Arts, 



ser. 2, xlviii. p. 253 (18G9;. 

 Brayichinecta arctica, Packard, in Hayden, U.S. Geol. & Geogr. Survev, 



p. 621 (1874) ; Amer. Naturalist, xi. p. 53 (1877). 



Coll. Hart : Discover}- Bay, in a small freshwater lake and in a 

 stream under ice. 



Several specimens were collected, including males and females, of 

 a species of Phyllopoda, which I refer to the B. arctiais of Verrill. 

 Of these species I have only seen the descriptions in the journals 

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

 port on the American Phyllopoda in the volume for 1869 of the 

 American Association for the Advancement of Sciences and Arts. 

 These specimens possess the elongated claspers, with serrated basal 

 joints, and elongated egg-pouches of the species of Branchinecta, and 

 are distinguished from the Branchipus paludosus of Muller, also from 

 Greenland (if his figure in the ' Zool. Danica,' pi. xl\'iii.,be correct), 

 by the much shorter lanceolate caudal appendages. In B. paludosa 

 these are represented as very slender, acuminate, and half as long 

 as the abdomen. 



These specimens differ slightly from the descriptions of B. arcticus 

 and f/rcenlandicu^, as wiU apj)ear from the following description. If 

 distinct (which may be possible, although I think it more probable 

 that the three forms are varieties of one and the same species), the 

 species may be designated B. Verrilli. 



The antennnae are slender, linear, and nearly as long as the 

 basal joint of the claspers. The large prehensile antennae, or "clas- 

 pers," as they are called by Verrill, arc nearly half as long as the 



