ixxxviii NATURAL HISTORY. 



10.— GAMMARUS AMPULLA. 



GAMMARUS AMPULLA.— 5at : Supp. to Parry's ist Voyage— -p. ccxxix. 



Ross, App. to Parry's Polar Voyage — p. 204. 

 CANCER AMPULLA.— PA#s's Voyage, Appendix— p. 192, pi. 12, fig. 2. 



In this species the superior antenna?, which have also the superadded seta, are one- 

 half shorter than the inferior ; the second pair of feet are unguiculate, not setose, but 

 the work is very minute. The fifth and sixth pairs have femoral laminae, but less than 

 those of the seventh pair. 



It is by no means abundant in the Arctic Seas, excepting near the Low Island (of 

 Phipps), Spitzbergen, where it was first discovered. Some few specimens were 

 obtained near Felix Harbour. 



11.— GAMMARUS BOREUS. 



GAMMARUS BOREUS.— Sa6: Supp. to Parry's 1st Voyage— p. ccxxix. 



Ross, App. to Parry's 3d Voyage — p. 119; and Polar Voyage — p. 204. 

 SQUILLA PULEX.— Dfgecr, Lis.— vol. vii., p. 525, pi. 33, figs. 1 and 2. 



G. caudtE dorso spinoso, oculis lunatis, pedibus quatuor anlicis chelatis, pari septimo praecedentibus 



longiore. {Sabhie.) 



Is found abundantly along the shores of the north-east part of the American 

 continent, and its contiguous islands, but especially so near the estuaries of rivers, 

 seeming to prefer the brackish to the salt water of the ocean. 



