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



anterior margin of the carapace, two of which are placed above the 

 eye-peduncle. The length of the largest specimen is 2 inches 4 lines 

 (59 millims.). All the specimens in the collection are females ; but 

 only one bears ova. 



H. spinus occurs on the British and Scandinavian coasts, at Green- 

 land, Spitzbergen, and on the shores of Arctic America (Felix 

 Harbour). 



Hippolyte turgida. 



Hippolyte turgida, Kroyer, Monogr. Fremst. Slsegt. Hippolyte's nor- 

 diske Arter, p. 100, pi. ii. figs. 57-58, pi. iii. figs. 59-63 (1842); Buch- 

 holz, Crust, in Koldewey, Zweite deutsche Nordpolarf. p. 273 

 (1874). 



Coll. Feilderi : Discovery Bay, 25 fathoms, one specimen, female ; 

 Franklin- Pierce Bay, one specimen, female with ova. 



Coll. Hart: Cape Fraser, 20 fathoms, one female example. 



This species is remarkable on account of the turgid form of the 

 body, and the convexity of the dorsal surface of the carapace. From 

 II. polaris (with some varieties of which species it might be con- 

 founded on first comparison) it is distinguished by the existence of 

 an additional spine upon the anterior margin of the carapace above 

 the eye-peduncle. The only perfect example obtained (a female) 

 has the rostrum y -toothed. Length about 1 inch 10 lines (47 

 millims.). 



(iocs, who had examined 100 specimens of this species, did not 

 find a single male in the series ; and he considered it to be the fe- 

 male of the Hippohjte Phippsii of Kroyer. By Buchholz the diifer- 

 ences are not regarded as sexual, as he states that he had observed 

 two male individuals of H. turgida, and a female of H. Phippsii ; 

 but he nevertheless considers the two forms probably varieties of 

 one and the same species. 



Although this species has not been noted by any of the earlier 

 Arctic voyagers, it may not improbably, in some instances, have been 

 confounded with H. polaris, to which, as stated above, it bears some 

 external resemblance. 



Its occurrence has been recorded on the coasts of Greenland, 

 Spitzbergen, and Norway. 



Hippolyte Phippsii ? 



? Hippolyte Phippsii, Kroyer, Nat. Tidsskr. 1 R. iii. p. 575 (1840-41); 

 Monogr. Fremst. Slseg't. Hippolyte's nordisk. Arter, p. 106, pi. iii. 

 figs. 64-68 (1842) ; Buchholz, Crust, in Koldewey, Zweite deutsche 

 Nordpolarf, p. 274 (1874). 



Coll. Hart : Cape Fraser, 20 fathoms, one specimen. 



A single specimen of a species of Hipp>olyte is in the collection, 

 which I refer with but little hesitation to this species. The only 

 point in which it differs from Kroyer's diagnosis is in the absence of 

 the second minute supraocular spine ; and this may well be a point 

 of less than specific importance. 



