APPENDIX. 335 



No. VIII. 



DESCRIPTIONS OF A NEW GENUS 



AND 



FIVE NEW SPECIES OF CRUSTACEA. 



BY ADAM WHITE, F.L.S. 



Family MAIAD^E. 

 Genus. Xenocarcinus, White. 



Carapace long, narrow, knobbed above, with a long 

 very thick beak. 



Beak cylindrical, horizontal, forming an elongated cone, 

 truncated at the end, with two small spines at the extremity, 

 one on each side. 



Inner antenna? rather thick, inserted in a deep groove 

 which is triangular in front. 



Outer antenna? springing from the under side of the 

 beak, just in front of the eyes, the first joint elongated, 

 somewhat bent, the second not half the length of the first, 

 both furnished at the end with two or three longish setae, 

 the other joints forming a bristle. 



Outer Pedipalps together occupying a square space — the 

 first joint very narrow at the base, the inner edge finely 

 serrulated, second joint very long, the sides almost parallel, 

 the end gradually pointed, the third joint somewhat pyri- 

 form with a tooth at the tip. 



Eyes with a short thick pedicel. 



Legs cylindrical, some of the joints slightly curved, tarsal 



