156 ANTHURID^. 



The mouth, of which the peculiar structure has been 

 overlooked by all previous writers, is evidently formed 

 for suction, and consists of a narrow process extending 

 along the anterior half of the under side of the head, 

 and porrected in a point in front.* 



The mouth is closed beneath by a pair of foot-jaws, 

 each composed of two oblong, flattened joints, the 

 second of which is slightly curved and somewhat pointed 

 to the tip, and armed along its inner edge with a series 

 of long hairs. Within this pair of foot-jaws appear 

 two long and extremely slender, nearly straight, setae, 

 of which the extremity, along the inner edge, is finely 

 retro-serrated. We regard this pair of organs as the 

 second pair of maxilla?, very similar in general structure 

 to those of the genus ^Ega and its allies. We have found 

 no trace of the first pair of maxillae, but the mandibles 

 appear to be represented by a pair of elongated, pointed 

 organs, having a three-jointed palpus, bearing a close 

 general resemblance to the mandibles and their appen- 

 dages in Limnoria, 2Ega, &c. These organs rest within 

 or beneath an elongated, conical, horny piece, of which 

 the tip appears to be deeply bi-sinuated, forming the 

 upper lip, and within the mouth we find another elon- 

 gated, single organ, thickened at the base, which may 

 possibly represent the * levre inferieure ' of Savigny. 



The seven following segments of the body are quite 

 distinct, the anterior ones being the longest, whilst the 

 last, or seventh, is the shortest of them all. The incu- 

 batory pouch in the females extends from the second 

 to the seventh segment. 



The tail is composed of six segments, the four an- 



* This description is made from individuals of the second species, above 

 alluded to, to which the name of Par. Costana haa been applied by Prof. 

 Westwood. 



