394 APPENDIX. 



orbits and greater part of the upper surface of carapace 

 spotted witli red, sides and hind part of carapace white ; 

 upper edge of the orbit covered with small papilla;; a 

 tolerably prominent ridge extends across the carapace 

 before the middle. Four hind pairs of legs long, slender, 

 compressed, the upper edges of the second and third pairs 

 fringed with hairs, as well as the lower edge of the two 

 terminal joints, the claws long, thin, and somewhat bent. 



Hab. Port Curtis. Shoal-water, mud-banks. 



This fine Crustacean is aUied to Gonoplax and Curto- 

 notus ; and being one of the most prominent species sent 

 home by Mr. Macgilhvray, is selected for description 

 here ; the figure is of the size of nature. 



Porcellanella triloba. Tab. v. fig. 2. 



Carapace somewhat flattened, the front produced into 

 three large teeth or lobes; the intermediate the widest 

 and most prominent ; the sides of the outer lobes rounded 

 before the eye ; carapace longer than wide, widest a httle 

 behmd the insertion of the antennse, the upper surface 

 smooth, polished, with some transverse scratched lines, 

 which are slight and irregidar, they are most observable 

 in front and on the sides, behind it is somewhat notched 

 in the middle. External antennae long, longer than twice 

 the breadth of the carapace, inserted in a sinus behind the 

 eye, the basal portion formed of three joints, the first 

 projecting beyond the sides of the carapace, the second 

 wider and longer than the first, thii'd short and thick at 

 the end ; the terminal part of antennse long, thread-like, 

 and formed of very numerous articulations ; the eyes large, 

 and with a short pedicel. Anterior legs long and smooth, 

 the pincers overlapping each other at the end, their inner 

 odge rough, scarcely toothed ; from before the base of the 

 inside of the moveable claw a thickish line of hairs extends 



