BY CHARLES CHILTON, M.A. 465 



ramus as long as the peduncle, articulated to its inner margin at 

 some distance from its extremity, slender, ending in a few setae, 

 the longest of which is about three-fourths the length of the joint ; 

 outer ramus twice as long as the inner and much stouter, narrowing 

 distally, ending in a few very short setae. The whole body, the 

 outer antennae and the terminal pleopoda supplied with short 

 stout scattered spines. Colour, light yellow, thickly covered with 

 black or dark-brown stellated markings. 



Length of largest specimen, 6 mm. 



Habitat. In rock-pools at Coogee Bay, N. S. Wales. 



The mandible is shewn in fig. 3 and 3a. I have been unable to 

 find a molar tubercle in it. The cutting edge of the mandible 

 itself consists of four teeth, three of about equal size, the fourth 

 much smaller ; the cutting edge of the accessory appendage ends in 

 two large teeth and one or two smaller ones. In one specimen 

 examined, the teeth were much blunter than those drawn, probably 

 it was an older specimen. Near the base of the accessory 

 appendage is a thin membranous plate fringed with setae, the two 

 innermost ones being the largest and fringed on one side. Further 

 along the inner edge of the mandible is another stout curved seta 

 with one edge fringed, and beyond this again are four setae arising 

 from a common projection, the first is the shortest, the second and 

 third increasing in length, all three having one side fringed, the 

 fourth is much longer and is simple, Probably all these fringed 

 setae of the one mandible meet those of the other mandible in the 

 median line and form a straining apparatus, or, since the setae are 

 somewhat stout, they may also be of some use in triturating the 

 food of the animal and thus to a certain extent take the place of 

 the molar tubercle. 



