DECAl'ODA. rORCELLANADsE. 



ANOMOURA. 



GENUS GALATHEA. FABR. 



CANCER, Linn. Degeer. Herbst. 



ASTACUS, Pennant. 



GALATHEA, Fabr. Latr. Leach, Edwards. 



Generic character. Antennce inserted on the same transverse 

 line. External antenna longer than the body, the three basa 

 segments thick, the second not longer than it is broad ; the terminal 

 filament long and slender. Internal antennae inserted beneath the 

 eye-stalks, the peduncle elongate ; the last segment acute, multi- 

 articulate, ciliated beneath. External pedipalps with the last two 

 articulations neither dilated nor foliaceous. Anterior feet equal, 

 or nearly so, thicker than the others, the claw well-formed; 

 second, third, and fourth pairs of feet simple, alike in form, with 

 acute nails ; fifth pair spurious, very slender, doubled above the 

 others within the branchial cavity, terminating in a rudimentary 

 hand. Carapace depressed, rather longer than broad, terminating 

 anteriorly in a sharp, more or less prominent, triangular rostrum, 

 which covers the base of the eye-stalks. Eyes large and bent 

 downwards. Abdomen longer and nearly as broad as the thorax, 

 six-jointed ; all of the joints without spines on the anterior mar- 

 gin, and terminating in a broad fan-like tail. 



THE species of which this genus is composed, are few in 

 number, although it is probable that some have been con- 

 founded which are in reality distinct. The genus as it has 

 hitherto stood, according to Edwards and other late 

 writers, is composed of the genera GalatJiea and Munida of 

 Leach ; I have, however, on what appears to me to be 

 sufficient grounds, restored Leach's genus Munida ; which 



O 2. 



