I. '08. 153 



as long as wide ; outer margin straight or slightly concave, the 

 apical spine not exceeding the lamellar portion of the scale. 



Colour in life. — Pale mottled grey or reddish, with darker 

 mottling along the inferior edges of the carapace, pleura, and 

 pleopods. Another form observed was of a dark mottled grey, 

 still darker laterally with whitish patches on the dorsal aspect 

 of the carapace, third, fourth and sixth abdominal somites, 

 and at the apex of the antennal scale. 



1 am indebted to Mr. Alexander Patience for a specimen 

 from the Firth of Clyde which shows a type of coloration 

 closely resembling that of the var. neglectus ; the carapace is of 

 a reddish chestnut colour, a band of the same tint being found 

 across the fourth and fifth abdominal somites and another 

 across the telson and uropods. This type of coloration seems 

 to be very rare, but it furnishes an additional proof of what I 

 have stated above — that colour is of the very slightest 

 systematic importance among the species of the genus. 



Size. — This species attains a length of about 20 mm. Scott 

 (1902) mentions ovigerous females of only 11 mm. 



The characteristic row of tubercles on either side of the 

 carapace are best seen if the superficial moisture from the 

 specimen is absorbed with blotting-paper before examination. 



The Irish examples of P. hispinosus appear to belong to a 

 race in which the tuberculation of the carapace is compara- 

 tively weakly developed. In no case is this feature as strongly 

 pronounced as it is in certain specimens from the Norwegian 

 coast. The latter individuals, which are in Canon Norman's 

 museum, represent an extreme type, the whole of the cara- 

 pace and part also of the abdomen being covered w^ith large and 

 prominent spinules. 



General distribution. — P. hispinosus is very common in the 

 N.E. Atlantic; it extends from the Lofoten Is., N. of the 

 Arctic Circle, to the English Channel, but is not known from 

 Iceland. Barrois (1888) has recorded the species from the 

 Azores. 



Irish distrihution. — Abundant all round the Irish coast. 



Vertical range. — Occurring at all depths in the Irish Sea 

 and off the west coast descending to as much as 200 fathoms. 



Philocheras bispinosus, var. neglectus (G. O. Sars). 



PI. XXI, figs. 5, a and b. 



Ckeraphilus neglectus, G. 0. Sars, 1882, PI. i, fig. 7. 

 Crangon neglectus, Norman, 1887. 

 Cheraphilus neglectus, Hansen, 1908. 



This form has been found off the Irish coast on only one 

 occasion and the specimens which were then obtained were so 



