appendix. 393 



Crustacea. Malacostraca : Decapoda. 

 Ommatocarcinus Macgillivrayi. Tab. v. fig. 1. 



Carapace more tlian twice as wide as long ; the sides in 

 front extended into a long slightly bent spine. The frontal 

 portion between the pedicles of the eyes is narrow^ much 

 as in Macrophthalmus, it slopes down towards the mouth, 

 and is deeply notched at the sides for the reception of the 

 eyes; the fore-edge is doubly notched in the middle, there 

 being a slight tooth between the emarginations. The 

 epistome not so prominent as the lower margin of the 

 orbit ; the inner antennae, with the basal joint, long (the 

 others broken off) . The eye-pedicles very long and cylin- 

 drical, thickest at the base, shghtly bent, somewhat thick- 

 ened towards the end, so long, that, when bent back, the 

 eye extends a little beyond the end of the spine. Mouth 

 formed nearly as in Gonoplax, the third joint of the jaw- 

 feet wider than long. Abdomen seven-jointed, the first 

 joint scarcely visible, shaped much as in Gonoplax, but 

 rather wider, the base of the terminal joint longer than 

 the sides. Anterior legs two and a half times as long as 

 the Carapace, measuring it from spine to spine, the arm 

 long and triangular, the upper portion more or less thickly 

 covered with small papillse, and having a nearly obliterated 

 spine about the middle ; the wrist smooth, roundish, with 

 a large blunt tooth on the inside ; hands somewhat flat- 

 tened, widest at the base of the claws, with a broad ridge 

 on the inside, the edge of it rough with small papillae; 

 the upper edge of hand rough with small papillae; the 

 claws lap over each other at the tips, and are irregularly 

 toothed on the inside ; the fixed claw of the right hand 

 bent at the base, so as to leave a considerable space when 

 the other is closed upon it ; upper part of arm, hand, and 

 moveable claw pretty thickly spotted with red, epistome 



