106 GAMMARID^E. 



the fourth joint largely developed, having a row of 

 tubercles or rudimentary spines on the interior margin, 

 but which become developed into long, strong, and 

 simple spines at the apex of the plate. 



The first pair of legs have subcheliform hands ; but in 

 this species these organs are not very robust. The hand 

 is not large, but long and narrow, being scarcely wider 

 at the palm than at the extremity near the animal. The 

 palm is oblique, slightly convex, and furnished with a 

 row of parallel equidistant teeth, offering a comb-like 

 arrangement upon the margin of the organ, and is de- 

 fined by two double-pointed spines, situated at the in- 

 ferior angle, against which the finder, which is furnished 

 with a second tooth or point, impinges. 



The second pair of legs are very long and slender ; so 

 slender as to be useless as prehensile organs, suggesting 

 the idea of being adapted to the same purpose as the 

 analogous imperfectly developed last pairs of legs in the 

 section Anomoura, which are used for the purpose of 

 cleaning and brushing the animal : they are plentifully 

 covered with hairs, those upon the anterior margin of the 

 hand being very long, while others upon the posterior 

 margin are shorter and fewer in number. The palm is 

 but slightly oblique, and has the margin slightly waved ; 

 the finger is small, and tuberculated near the base, it has 

 the apex slightly curved, which, when it closes, antago- 

 nizes with a strong spine ; several of these spines lie 

 concealed amidst the brush of simple hairs on the 

 posterior margin. All these spines, when closely exa- 

 mined, are found to have the side near the hand minutely 

 serrated. The two anterior pairs of walking feet are 

 slender: the three posterior are tolerably robust, and 

 have the posterior margins of the second joints serrated, 

 the last being the most perfectly so. Each of the caudal 



