I. '08 160 



Pontophilus spinosus (^Leach). 



PI. XXI, figs. 8, a-d. 



Crangon spinosus, Bell, 1853, fig., p. 261. 

 Cheraphilus spinosus, Kinahan, 1861, fig. vii.^ 

 Crangon spinosus, Heller, 1863, PI. vii, fig. 16. 

 Pontophilus spinosus, M. Sars, 1868, PI. ii, figs, 38-45; 



PI. m, figs. 46, 47. 

 Pontophilus spinosus, G. 0. Sars, 1890, PL iii, figs. 1-20 



(development). 



Bostriu}i short, slightly hollowed dorsally, broad at base, 

 tapering rapidly to a narrow rounded apex, and bearing at 

 about its middle a small short spinule on either side. Cara- 

 pace broad, with five longitudinal dentate carinae ; the median 

 with three stout teeth and frequently with one or tw^o minute 

 spinules in addition in front of the most anterior. First 

 lateral carina also bearing three stout teeth, second lateral 

 with U\o on its anterior half. Antero-lateral angle flanked by 

 a short carina Avhich rapidly becomes obsolete, vanishing com- 

 pletely on the branchial region. 



First four ahdominal somites very faintly carinate dorsally ; 

 fifth with two pairs of posteriorly divergent carinae ; sixth 

 with two pairs of parallel carinae, the outer pair usually very 

 obscure. Telson dorsally sulcate and rather longer than the 

 inner uropod. 



Basal joint of ayitennular peduncle very slightly longer than 

 second and third combined, furnished in the middle of its in- 

 ferior margin with a stout forwardly directed spine ; lateral 

 process acutely pointed and reaching slightly beyond distal 

 end of segment. Second joint longer than third and almost 

 as broad as long. Antennal scale (fig. 8 b) in adult specimens 

 not quite two and a half times as long as wdde ; outer edge 

 somewhat convex proximally and slightly concave distally, 

 apically jirbduced to a sharp spine reaching beyond the distal 

 end of the lamellar portion of the scale. 



Colour in life. — Large specimens show a very striking type 

 of coloration. The carapace and abdomen are mottled reddisli 

 brown. Dorsally the carapace has a prominent bluish white 

 patch extending from the base of the rostrum to the second 

 median spine and bounded laterally by the first lateral carina. 

 Similar bluish white patches are present on the abdominal 

 somites, telson and uropods. A pair of dorso-lateral patches 

 are present on the first somite, there is a prominent trans- 

 verse band on the posterior edge of the third somite, a broad 

 band extends across the base of the telson and uropods, and 

 there is also a spot of the same colour at the apex of the outer 

 uropods. The eyes are greyish. The outer maxillipedes, 



1 The spinulation of the carapace in this figure is quite imaginary. 



