180 CRUSTACEA. JSOPODA. 



had extensively suffered from its ravages, the animal boring the fresh wood in all di- 

 rections. No species of wood seems exempted from its action, and the perforations 

 being made solely for protection, no coating, except a metal one, which should totally 

 cover the piles, would protect against its devastations. 



Gen. 8. SEROLIS, Leach. 



Superior antennae formed of four joints, larger than the first 

 three of the inferior antennae, which have five joints ; second 

 pair of feet with the last joint widened and the nail much 

 elongated ; the sixth pair spinous behind ; anterior ventral 

 appendages formed of two equal foliaceous portions, rounded 

 at their extremity and furnished with hairs at their base. 



S. Fabricii, Leach. (Cymothoa paradoxus, Fab.) Three tubercles 

 behind the eyes disposed in a triangle j last segment of the ab- 

 domen carinated at the base ; and the upper part with two ele- 

 vated lines. Inhabits coasts of Africa. Desm. Crust. 293. 



FAMILY III. SPH.EROMIDES. 



Post-abdomen composed of three segments ; the last with a fin 

 of two leaflets on each side. 



Gen. 9- ANTHURA, Leach. Oniscus, Mont. 

 Antennae short, subequal, the intermediate a little longer than 

 the lateral ones ; body linear ; anterior feet with a moveable 

 claw or thumb ; lateral laminae of the tail foliaceous. 



A. gracilis, Leach. Lateral processes of the tail obliquely trun- 

 cated Lin. Trans, ix. pi. 5, fig. 6. 



Gen. 10. ZUZARA, Leach. 



Posterior appendages of the abdomen with the two laminae pro- 

 jecting, the exterior larger than the interipr ; body capable of 

 rolling up into a ball; abdomen with the last segment notch- 

 ed at the extremity. 



Z. diadema, Leach. Body smooth ; seventh segment of the body 

 prolonged behind, and dilated; exterior laminae of the ventral 

 appendages tapering and rounded to the extremity. Inhabits 

 seas of New Holland. Desm. Crust. 299. 



Gen. 11. SPH^EROMA, Lat. Leach. Oniscus, Lin. 

 Posterior appendages of the abdomen with two equal projecting 

 laminae ; last segment of the abdomen entire or notched ; 

 claws bifid ; body rolling up into a ball. 



S. serrata, Leach. (Cymothoa,~Fab.) Body smooth ; tail oblique- 

 ly truncated ; lamellae elliptic, acute, the external ones serrated. 

 Inhabits European shores. Lin. Trans, xi. 303. 



Gen. 12. CAMPECOPEA, Leach. Oniscus, Mont. 

 Body of six segments ; antennae setaceous, upper ones longest, 

 and space between them large ; anterior claws bifid ; tail with 

 the last segment furnished on each side with a compressed, 

 curved appendage. 



