Ci.S AMPHIPODA. 



Month on the Trondhjem Fiord," Ann. & Mag. Nat. Hist. 

 ser. ('), vol. xv. 1895, p. 480) ; but the three species of Sars 

 should perhaps be united as having only varietal importance. 

 Ilfracombe, Exmouth, near Duke Buoy, Plymouth, and 

 Scilly Isles (A.M. N.). 



Genus PONTOCRATES, Boeck, 18GO. 



There has been much confusion respecting the species of 

 this genus both on the Continent and in our own country 

 since the time when Boeck, in 187G, made the Kroyera 

 (trrnaria of Bate a synonym of his Pontorrates norvegicus. 

 Most records of the occurrence of the several species nm-t 

 therefore be received with some caution. 



PoXTOCRATES ARENARIUS (Bate). (PL VI. figs. 1-4.) 



1858. Kroyera ctrenaria, Bate, " Descr. two rrire Crustaceans from. 



the coast of Durham, one of them a new species," Trails. Tyneside 



Nat. Field Club, vol. iv. p. 15, pi. ii. tig. 1. 

 1858. Kroyera arenariu, A. Hancock, "Oil certain vermiform 



fossils," ibid. p. 19, pi. iv. (its vermiform tracts on the sand). 

 18(52. Kroyera areiiaria, Bate, Cat. Amphip. Brit. Mus. p. 106, 



pi. xvii. tig. 4. 



1862. Kroyera ami aria, Bate & Westwood, vol. i. p. 173. 

 1889. Pontocrates arenariiis, Iloek, "Crustacea Neerlandica, II.," 



Tijdscli. d. Nederl. Dierk. Vereen. ser. 2, vol. ii. p. 23, pi. ix. 



tigs. 7, 8. 



First gnathopod (fig. 1) ovate, with undefined, very oblique 

 palm, the finger closing upon the side, and reaching back- 

 wards to about that point to which the extremity of the 

 produced and underlying carpus extends. Second gnathopod 

 with the hand long, narrow, and slightly curved (fig. 2) ; 

 chela narrow ; the attached carpus extending far beyond the 

 extremity of the hand to a distance which is subequal in 

 length to the breadth of the chela ; the projected portion is 

 rod-like in form, tapei-ing at the extremity and furnished 

 with numerous set?e (fig. 3). 



Hoek's figures of the second gnathopod are very good. 



Whitsand Bay near Plymouth, 1889 and 1903 (A.M. ^V.). 



PONTOCRATES NORVEGICUS, Boeck. (PL VI. figs. 5-8.) 



1861. Pontocrates norvegicus, Boeck, Forhand. Stand. Naturforsk. 



8 Mode, 1860, p. 650. 



1870. Pontocrates norveyicus, Boeck, p. 91. 

 1876. Pontocrates norvegicus, Boeck, p. 288, pi. xvi. fig. 4. 

 1895. Pontocrates noroegicus, Sars, p. 693, Suppl. pi. vi. fig. 2, 



pi. vii. fiff. ] 



