4G4 ON A MARINE SPECIES OF PIIILOUGRIA, 



'To this question I can give no satisfactory answer, but it resembles 

 the terrestrial Philougria so closely that I am inclined to think it 

 is a terrestrial form that has in the struggle for existence been 

 forced to return to a life in the sea. 



I append a detailed description : — 



Philougria marina, sp. nov. Plate, XI., fig. 1 to 6. Length 

 of body rather more than twice the greatest breadth ; lateral lobes 

 of the cephalon projecting about as far as the central portion which 

 is rather pointed ; eyes rather large and prominent, considerably 

 raised above the lateral portions of the cephalon. External 

 antenna? slightly longer than the cephalon and first three segments 

 of the pereion, first three joints short, fourth as long as the two 

 preceding, fifth slightly longer than the third and fourth together, 

 narrow at base and slightly sinuous, flagellum a little longer than 

 the fourth joint, composed of four joints, first three of about equal 

 length, but narrowing distally, fourth slender, merging almost 

 imperceptibly at the end into a pencil of very short setae. Internal 

 antennae very small, of three joints, the first much larger than 

 either of the others, as loug as the second and third together, the 

 second and third joints each bearing a small stout seta at their 

 distal ends. Thoracic legs rather spinous, the lai'gest spine, which 

 splits up into three or four branches, being situated on the inferior 

 margin of the carpus near its distal end. From the dactylos 

 of each leg arises a seta longer than the dactylos, divided into two 

 branches, the one remote from the dactylos being the longer and 

 clubbed at the end, the other branch simple. Terminal segment of 

 pleon triangular, sides concave, end rounded and supplied with 

 two or three very small short setee, not reaching quite as far as the 

 end of the peduncle of the terminal pleopoda. Terminal 

 pleopocla moderately long, basal joint large, as long as broad, inner 



