Mr. E. J. Miers on Arctic Crustacea. 107 



form lobe. The second pair of maxillipeds are cylindrical and about 

 as long as the cephalothorax:, with a thickened marginal rim at 

 the distal extremities, which are united, and terminate in a large, 

 membranous conical bulla, which is imbedded in the body of the 

 animal to which the parasite adheres. 



The nearest aUy of this species is evidently the Lermmpoda, Ed- 

 wardsii of Olsson, Acta Universit. Lund., p. 36 (1868), from Xorway, 

 from which it differs in the somewhat shorter ovaries and abdomen 

 and the form of the claw of the first maxilliped. This species has 

 not been figured ; and a comparison of specimens might prove the L. 

 arcturi to be identical with it. From the L. carpionis of Krijyer, 

 to which it is also nearly allied, it difi'ers in the form of the bulla 

 of the second maxilliped, &c. ; from the L. salmonm of ilayor 

 (Bull. Soc. Philom. p. 24, 1824), which Olsson, who had not seen 

 Mayor's original description, considers synonjinous with his L. Ed- 

 wardsii, but which is probably a diiferent species, in the smooth 

 abdomen, and, if Milne-Edwards's figure be correct, in the form of 

 the head, ovaries, &c. 



The Achtheres Carpenten, described by A. S. Packard, junr., from 

 a trout in the East liiver, Colorado (Rep. U. S. Geol. and Geogr. 

 Survey, 1874, p. 612), to judge from the outline figure which accom- 

 panies the very brief description, resembles this species. The abdo- 

 men, however, is said to possess indications of division into three 

 segments, which are not indicated in the figure. 



CIRRIPEDIA. 



BALANIDiE. 



Balanus porcatus. 



Bulanus porcatus, Da Costa, Hist. Nat. Test. Brit. p. 249 (1778) ; 

 Darwin, Monogr. Cin-ipedia, Balanidse, p. 256, pi. vi. fig. 4 (1854) ; 

 Buchholz, Crust, in Koldewev, Zweite deutsche Nordpolarf. p. 396 

 (1874). 



Coll. Feilden : Cape Napoleon, from a depth of 50 fathoms, five 

 specimens, 25 fathoms, two specimens ; Richardson Bay, 80° 2' 

 N. lat., 70 fathoms, one specimen. 



CoU. Hart : Franklin- Pierce Bay, 13-15 fathoms. 



The largest specimen collected has a greatest height of rather 

 over 1 inch 1 line (28 millims.), and greatest diameter of nearly 

 1 inch 2 lines (29 millims.). The specimens from Cape Xapoleon 

 agree well with B. jiorcatm in the sharply and strongly ribbed 

 parietes of the shell, the radii of which are parallel to the base, and 

 in the characters of the opercular valves. The small si)ecimcn from 

 Richardson Bay, height 7 lines (15 miUims.), greatest diameter 

 6 lines (nearly 13 millims.), I was at first inclined to think might 

 be B. crenatus, on account of the very oblique and narrow radii ; 

 but the characters of the opercular valves are those of B. porcatus, 



