106 
GAMMARIDiE. 
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 finger, 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 
