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



Kroyer, Monogr. Fremst. Slsegt. Hippolyte's nordiske Arter, p. 122, 

 pi. iii. figs. 74-77 (1842) ; Bell, in Belcher, ' Last of the Arctic 

 Voyages,' ii. p. 400 (185-5); Buchholz, Crust, in Koldewey, Zweite 

 deutsche Nordpolarfahrt, p. 276 (1874). 



Coll. Feilden : Discovery Bay, at 25 fathoms, several specimens ; 

 Cape Napoleon, at 25 fathoms, two specimens ; Franklin -Pierce 

 Bay, at 15 fathoms, three specimens. 



Coll. Hart : Franklin-Pierce Bay, 13-15 fathoms, four speci- 

 mens ; Dobbin Bay, 30 fathoms, one specimen. 



This species is characterized by its elongate, slender, horizontal 

 rostrum, the upper margin of which is straight and entire ; upon 

 the lower margin, near the apex, there are usually 3-4 small teeth ; 

 in several specimens there are 5, in one or two specimens only 2 

 teeth on the lower margin. There are two spines on the anterior 

 margin of the carapace, one above and one below the eye. Length 

 of the largest specimen collected, 2 inches 3 lines (57 millims.). 



There is not among the specimens of this species a single female 

 with ova ; it is probable that all are of the male sex. iS'o females 

 were collected by the German Arctic Expedition, under Captain Kol- 

 dewey ; and Goes (ffifv. Vet. Ak. Forhandl. 1863, p. 170) states that 

 he has never observed any among the large number of specimens 

 examined by him. 



By Goes (QSfv. Yet. Ak. Forh. p. 170, 1863) this species is con- 

 sidered identical with H.polaris; and by Buchholz (/. c.) it is not 

 thought to be more than a variety. That the differences between 

 the two forms are not sexual, as might have been surmised, would 

 seem to be proved by the fact that Buchholz mentions the oc- 

 currence of males and females of H. polarls in nearly equal num- 

 bers. For the present I think it desirable to regard the two forms 

 as distinct species. The differences are at least as great as those 

 between many other species of the genus ; and no strictly interme- 

 diate varieties have been observed. 



The geographical range of H. horealis is the same as that of H, 

 polaris. 



Hippolyte groenlandica. 



Astacus grmnlandicus, J. C. Fabricius, Syst. Ent. p. 416 (1775). 

 Cancer aculeatus, 0. Fabr. Fauna Groenlandica, p. 289 (1780). 

 Alpheus acnleaf.m, Sabine, Zool. in Append. Parry's 1st Vov. p. 59, pi. 



ii figs. 9, 10 (1821 ) ; Ross, Append. Parry's 3rd Voy. p. 120 (1826) ; 



4th Voy. p. 206 (1828). 

 Hippolyte aculeata, Owen and Ros.'s, Crust, in Append. Ross's 2nd Voy. 



), pi. IV. 



figs. 83-98, pi. V. figs. 99-104 (18"42) ; Brandt, in Middendorff, Sibiri- 



sche Reise, Krebse, p. 118 (1851) ; Bell, Crust, in Belcher, ' Last of 



the Arctic Voyages,^ p. 401 (1855). 

 Hippnhite armata, Owen, Crust, in Beechey's Voy. ' Blossom,' p. 88, pi. 



xxvii. fig. 2 (1839), ?. 

 Hippolyte corrmta, Owen, Crust. Beechey's Voy. ' Blossom,' p. 89, 



pi. xxviii. fig. 2 (1839), J. 



