166 CRUSTACEA. DECAFODA. 



pairs of feet didactyle, the following ones very long ; body 

 soft, hispid, and the shell before with a short spinous rostrum. 



S. hispidus, Lat. (Palcemon, Oliv.) Shell covered with small 

 spines, and terminated before by a projecting spinous rostrum ; 

 body 2 inches long, exterior antennae 3J inches. Inhabits South- 

 ern seas. Desm. Crust. 227- 



Gen. 61. ALPHEUS, Fab. 



Four anterior legs didactyle, the first pair longer than the se- 

 cond; exterior feet-jaws with the last joint of the internal foot- 

 stalk three times longer than the preceding joint; the two supe- 

 rior antennae bifid ; the two exterior setaceous, with a large 

 scale at the base. 



A. Malabaricus, Fab. Hands of the first pair of feet unequal, the 

 one large, compressed, with the thumb much bent and pointed, 

 and the other smaller, with the claws filiform and long ; rostrum 

 short and subulate. Inhabits Indian seas. Desm. Crust. 222. 



A. monopodium, Lat. Left hand of the first pair of feet very thick ; 

 the other filiform ; scale at the base of the antennae very small. 

 Inhabits Indian seas. Desm. Crust. 223. 



Gen. 62. HIPPOLYTE, Leach. 



Four anterior legs didactyle, the others terminated by a simple 

 spinous claw ; exterior feet-jaws with the penult joint much 

 shorter than the last, which is spinous ; shell short and broad, 

 with a short rostrum anteriorly ; fins of the tail elongated. 



H. varians, Leach. Rostrum straight, with two teeth above and 

 below; shell with one spine above and beneath the eyes. 8 

 lines long. Inhabits shores of Devonshire. Liu. Trans, xi. 347- 



Gen. 63. AUTONOMEA, Risso. 



Intermediate antennas terminated by two filaments, of which 

 one is much larger and thicker than the other ; the exterior 

 ones longer than the body ; first pair of feet didactyle, very 

 large, thick, and unequal ; the others short, and terminated 

 by simple hooks ; body elongated, glabrous ; shell slightly 

 gibbous, terminated before by a short sharp point or rostrum. 



A. Olivii, Risso. Thorax glabrous, semitransparent, yellowish, 

 slightly variegated with reddish tints ; first pair of feet red above, 

 yellowish below. 15 lines long. Inhabits coast of Nice, among 

 algae. Desm. Crust. 232. 



Gen. 64. GNATHOPHYLLUM, Lat. 



Intermediate antennae terminated by two filaments ; the exte- 

 rior ones setaceous, a little shorter than the body ; exterior 

 feet-jaws foliaceous, covering the mouth ; four anterior feet 

 didactyle ; forceps of the second pair thinner and longer than 

 those of the first ; shell terminated by a rostrum. 



