I. '08. 144 



ii. Carapace with one median spine, behind 

 which is a second small tubercle-like spine 

 (occasionally obsolete). 



a. Numerous minute tubercles arranged in 

 longitudinal series on either side of the 

 median line, . . .P. hispinosus (p. 152), 



h. No tubercles on cither side of the median 

 ^line, . . P. hispinosus, V. neglectiis ({). 153). 



II. Apex of rostrum squarely truncate or emarginate. 



A . Apex of rostrum squarely truncate ; only one 



spine on median line of carapace ; abdomen 

 smooth and unsculptured ; antennal scale 

 with only the usual distal spine on its outer 

 edge, . . . . .P. fasciatus (p. 151), 



B . Apex of rostrum emarginate ; several spines on 



median line of carapace ; abdomen strongly 

 sculptured ; antennal scale with a stout spine 

 at about the middle of its outer edge, 



P. sculptus (p. 148), 



Philocheras echinulatus (M. Sars). 



PI. XXI, figs. 7, a-d. 



(yrangon echinulatus , M. Sars, 1861. 

 Crangoii serratus, Norman, 1862. 

 Cheraphilus echinulatus, G. 0. Sars, 1882. 

 Cheraphilus echinulatus, G. 0. Sars, 1890, PL ii, figs. 

 1-21 (development). 



Rostrum dorsally hollowed and rather broad at base, taper- 

 ing to a finely rounded point. Carapace with antero-lateral 

 angles produced to a sharp point, armed with five longitudinal 

 dentate carinae, one median and two pairs of lateral. Median 

 carina armed with three stout equidistant spines ; first lateral 

 with six spines, of which the second and third are rather 

 widely separated from each other, the sixth close to the pos- 

 terior margin and sometimes obsolete. Between the first 

 lateral and the median carinae another row of teeth is fre- 

 quently present on each side ; they are very small and three or 

 four in number ; the second and third are on a line with the 

 first two median spines, while the third is situated behind the 

 posterior median s])ine and from it a carina runs towards the 

 posterior margin. Third lateral row consisting of a well- 

 marked carina which extends from close behind the orbital 

 angle to the hinder edge of the carapace ; it is furnished with 

 two stout spines on its anterior third, in front of which an- 

 other very small tooth is often present. 



First two ahdoniinal somites dorsally smooth ; third and 

 fourth carinate on their posterior half, the former often only 



