296 SUPPLEMENT 



In General Hardwick's collection is a crab which Mr. Gray 

 has appropriated to a new genus named Gomez A. Tt is 

 apparently intermediate between Corystes among the orbicu- 

 lar crabs, and Leach's genus Atelecydus, having the long 

 antennae of the former, with the short claws, and somewhat 

 of the shape of the latter. The thorax is ovate and convex ; 

 over the eyes are two spines with denticulated margins; the 

 outer antennae, longer than the body, are ciliated above and 

 below ; the eyes are enclosed in a pit, larger than the stems. 

 The specimen, G. hicornis, is pale yellow (when dry); the 

 thorax covered with white granules. This species inhabits 

 the Indian ocean. 



The Dromi^ seize with their hind feet alcyones, the valves 

 of shells, and other bodies, under which they shelter them- 

 selves, and which they carry along with them. Some have 

 pronounced the cancel' dromia to be venomous. 



Our Dromi(B Indica has the thorax subglobose ; the back 

 smooth, evenly convex, covered with short hairs ; the front 

 bifid, with an obscure central inferior tubercle ; each side 

 with five roundish tubercles, distant ; the upper edge of the 

 front, and of the carpus, tubercular. Our figure is from a 

 specimen in possession of General Hardwick, which inhabits 

 the Indian ocean. 



According to Rumphius, the RANiNiE come to land, and 

 climb even to the tops of houses; but from the form of their 

 feet, this appears to be impossible, or at all events of very 

 small probability. 



We have now to speak of the inacrouroiis decapods, and 

 shall first make a few general remarks on the genus AsTA- 

 cus. 



This genus, in consequence of the fresh-water species which 

 is found throughout all Europe, and universally used as food, 

 is one of the most generally known, and one of the most 

 studied, in the whole class of the Crustacea. There are few 



