I. '08. 162 



Pontophilus norvegicus (M. Sars). 



PL XXI, figs. 9, a and b. 



Crangon norvegicus, M. Sars, 1861. 



Pontophilus norvegicus, M. Sars, 1863, PI. i, figs. 1-25 ; 

 PI. II, figs. 17-37. 



Pontophilus norvegicus, G. 0. Sars, 1890, PI. iv, figs. 

 1-20 (development) . 



Pontophilus norvegicus, WoUebaek, 1900, PL i, fig. 2. 



Rostrum narrower and relatively rather longer than in the 

 preceding species, slightly hollowed dorsally, terminating in 

 an acute point, and armed at about its middle with a pair of 

 small lateral spinules. Carapace with five longitudinal dentate 

 carinae ; the median armed with three stout teeth, in front of 

 which a small tubercle is occasionally found, first lateral carina 

 with two teeth on its anterior half ; second lateral with only 

 one tooth placed in advance of the median anterior tooth. A 

 short carina extends backwards from the antero-lateral angle 

 as in the last species. 



First four ahdoviinal somites dorsally smooth and rounded ; 

 the fifth with vei y faint traces of posteriorly divergent carinae , 

 sixth bicarinate. Telson dorsally sulcate, rather shorter than 

 inner uropods» 



Eyes considerably larger than in P. spinosus. Basal joint of 

 antennular peduncle much longer than second and third com- 

 bined, the second joint longer than broad ; otherwise similar to 

 the preceding species. Antennal scale (fig. 9 b) not narrowed 

 distally, nearly three times as long as wide, its outer edge con- 

 cave and furnished with an apical spine which does not exceed 

 the lamellar portion of the scale. 



In this species as well as in P. spinosus the fingers of the 

 chelae of the second pair of legs meet only at the tips and bear 

 ungues, that of the fixed finger being longer than that of the 

 dactylus. The whole hand agrees almost exactly wdth the de- 

 scription and figures given by Stebbing (1905) for P. gracilis. 



Colour in life. — The carapace and abdomen are dorsally of a 

 pale and dull reddish brown Colour, often having a mottled ap- 

 pearance owing to certain small areas being less thickly pig- 

 mented than the rest. The red-brown colouring is darkest on 

 the posterior portions of the last three abdominal somites. 

 Anteriorly the carapace is semi-transparent, the black gastric 

 regions showing through the walls. Jjaterally a few sparse 

 umber brown chromatophores are mixed wdth those of reddish 

 brown on both carapace and abdomen, while on the former 

 there are also two conspicuous bands of pure white w^hich run 

 obliquely upwards and backwards from the jDosterior margin. 

 Traces of this white colouring may also be observed on the 

 pleura of the first two abdominal somites. 



