NO. 5.] ACCOUNT OF THE SPECIES. 133 



from the tip, a densely plumose seta originates. The 3 distal joints con- 

 stitute together a very movable terminal part, which, as a rule, forms, with 

 the basal joint, an abrupt geniculate bend. The joints gradually diminish in 

 size, and carry scattered setae, some of which are ciliated along one of the 

 edges. Two of these setae, issuing from the tip of the last joint, are 

 particularly strong, almost claw-shaped. 



The maxillae (fig. 8) consist each of a thick, muscular basal part pro- 

 jecting inside in 2 linguiform masticatory lobes clothed with spiniform setae, 

 the outer one being somewhat larger than the inner. Outside these lobes, 

 a well defined palp is movably attached, extending below. It consists of 2 

 joints, the 1st of which is rather large and expanded, oblong oval in form, 

 and carries anteriorly 5 slender curved setae, posteriorly 3 similar but shorter 

 setae and 2 small spines. The distal joint is rather small, and abruptly 

 recurved, carrying several strong, curved spines at the tip. 



The 2 succeeding pairs of limbs (PI. XXXVI, figs. 3 & 4) have each, at 

 the base outside, a trilobate vibratory (branchial) plate, placed vertically, and 

 fringed with densely plumose setae, the /mmber of which is from 14 to 18. 

 Both these pairs are pronouncedly pediform, whereas in other Myodocopa, 

 the anterior pair have wholly lost their pediform character, and are generally 

 described as a 2nd pair of maxillae. In the present form, it is also found, 

 that this pair, though, on the whole, resembling the succeeding one, exhibit 

 some characters indicating that they are not exclusively locomotory, but also 

 subservient to mastication. They are each composed (see fig. 3) of 4 

 distinctly defined joints, the 1st of which, however, differs materially from 

 the others, forming a rather large and expanded basal part, provided at the 

 anterior edge with several ciliated setae, and, moreover, projecting at the end 

 anteriorly in an obtusely conical prominence, densely clothed with spiniform 

 setae. This prominence is turned towards the mouth, and undoubtedly has 

 the signification of a true masticatory lobe. The 3 distal joints form together 

 a very movable terminal part or palp, which is about the length of the basal 

 part, and is generally extended obliquely behind, almost at a right angle 

 with the former. Its 1st joint is rather broad at the base, gradually tapering 

 distally, and is clothed with several ciliated setae on both edges. The 2nd 

 joint is of about the same length, but much narrower, subcylindric in form, 



