Mr. E. J. Miers 07i Arctic Crustacea. 61 



The rostrum is slender and straight, of the form figured by Kroyer 

 (I. c), and has ten very small teeth on its upper and five near the 

 distal extremity of its inferior margin. Length nearly 1 inch 4 

 lines (33 millims.). 



This species is found on the shores of Finmark, Spitzbergen, and 

 Greenland. 



Hipjpolyte polaris. 



Alpheus polaris, Sabine, Append. PaiTy's 1st Voy. no. x. p. 60, pi. ii. 

 figs. 5-8 (1821) ; Ross, Append. Parry's 4th Voy. p. 206 (1828). ' 



Hippolyte polaris, Ross and Owen, Append. Ross's 2Dd Voy. Zool. Crust. 

 p. Ixxxv (1835) ; M.-Edw. Hist. Nat. Crust, ii. p. 376 (1837) \ 

 Kroyer, Monogr. Fremst. Slaegt. Hippolyte's nordiske Arter, p. 116' 

 pi. iii. figs. 78-81, pi. iv. fig. 82 (1842) ; Bell, in Belcher, 'Last of 

 the Arctic Voyages,' ii. p. 401 (1855) ; Goes, (Efv. Vet. Akad. For- 

 handl. p. 109 (1863) ; Buchholz, Crust, in Koldewey, Zweite deutsche 

 Nordpolarf. p. 275 (1874). 



Coll. Eeilden : Discovery Bay, 25 fathoms, abundant ; Cape Na- 

 poleon, five specimens; Franklin-Pierce Bay, 15 fathoms, two 

 specimens. 



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

 mens ; Dobbin Bay, 30 fathoms, one specimen. 



In this species there are three or four spines in a median series 

 on the back of the carapace, and three spines upon its anterior mar- ' 

 gm, one above and one below the eyes, and one at the junction of 

 the anterior and inferior margins. The rostrum is toothed above and 

 below, and acute at the extremity, which is directed somewhat up- 

 ward. The number of teeth on the upper and lower margins, 

 however, is very variable, averaging 7-9 on the upper, and 3-4 on 

 the lower margin. 1\\ one specimen the rostral teeth = ^J, in 

 another |. Kroyer, in the diagnosis of this species in his mono- 

 graph of the genus Hippolyte (p. 121), gives g as the number of 

 the rostral teeth ; but this is somewhat below the average. The 

 length of the largest specimen (a female with ova) is 2 inches 

 7 lines (66 millims.). In this specimen the rostral teeth =|. 



I have observed no distinctive sexual characters in the^'indivi- 

 duals collected, although a greater number were obtained of this 

 species than of any other in the genus. There are a large number 

 of females with ova; and perhaps all the specimens are of this 

 sex. According to Buchholz, who observed a nearly equal number 

 of specimens of both sexes, the females are generally larger than 

 the niales, and have the upper antennae shorter. 



This species occurs abundantly on the coasts of Greenland and 

 Spitzbergen, and is also found on the shores of Norway and the 

 Province of Finmark and Arctic America (Melville Island). 



Hippolyte horealis. 



Hippolyte horealis, Owen, Append. Ross's 2nd Voy. Crust p Ixxxiv 

 pi. B. fig. 3 (1835); M.-Edw. Hist. Nat. Crust, ii. p. 372 (1837)' 



