ON ANTHUKA GRACILIS (MONTAGU). 



243 



the peraeopods the anterior margins of the fourth and fifth joints are 

 pectinate, the spines in the female being longer and more setiform in 

 character ; the finger also bears some small spines : two stout spines 

 are inset together at the anterior distal angle of these joints, and a long 

 plumose sensory hair at the posterior angle of the fourth joint. In the 

 male the third joint of the fifth peraeopod is provided with two long 

 sensory plumose hairs as long as the succeeding joint. 



Pleopods 1 in both male and female, with the outer rami greatly 

 expanded, forming a kind of operculum, reaching in the female to the 

 extremity of the fifth segment of the pleon, in the male considerably 



Anthura gracilis. FiG. 12.— Second pleopod, ^, x 42. 



beyond the end of the pleon. The modified second pleopod of the male 

 is figured (Fig. 12). 



Telson and uropods as described by Norman and Stebbing, so con- 

 structed "as to resemble nearly a cylinder, with one side (the dorsal) 

 cut obliquely away. The telson has the apex truncated, and is of the 

 same length as the inner branch of uropods. Outer branches of uropods 

 nearly meeting at their bases dorsally, broadly lanceolate, curved, 

 rather longer than the first joint of the inner branch." 



Colour, yellowish white, with markings of a brownish pigment in the 

 form of cloudy patches. The colour varies considerably, probably with 

 the nature of the ground on which the animal lives, some specimens — 

 as the Eddystone one — having only a few small dotted patches on the 

 head and peraeon, others again being nearly covered with the brown 

 tint. 



NEW SEIUES. — VOL. X. Xo. 2. JUNE, 1914. 



