70 Mr. C. Spence Bate on a new Genus of Macrura, 



fringed with long hairs at the broad and leaf-like extremity ; 

 the fourth is fringed with a few hairs on the inner side and 

 apex only ; whereas the fifth or posterior branch is fringed 

 with cilia all round, the hairs being centrifugally arranged 

 with their extremities slightly curved towards the anterior 

 point. 



The third siagonopod {g) is six-jointed and biramose. The 

 first and second joints are produced on the inner side in the 

 form of two large foliaceous plates, the margins being 

 fringed with a series of fasciculi of long and stiff hairs ; the 

 plate of the second joint is produced beyond its distal 

 extremity or outer portion, from which it is distinctly 

 separated for about half its length, and the distal extremity 

 of the joint has the inner angle furnished with a bundle of 

 long hairs. 



Succeeding these, four other joints are successively ])ro- 

 daccd, being subequal in lengthy of which the penultimate 

 is the longest and the last the shortest, each gradually narrow- 

 ing in diameter and tapering to the distal extremity, and 

 each furnished with a fasciculus of hairs at the inner distal 

 extremity ; on the outer side a second branch, a true bas- 

 ecphysis, projects, the base of which consists of a long and 

 robust joint furnished on the outer margin with a few simple 

 hairs and continued at the extremity into a multiarticulate 

 ramus, which is nearly smooth or only sparsely furnished 

 with hairs. 



The first pair of gnathopoda {h) are pediform and biramose, 

 the basecphysis being well developed and reaching rather 

 beyond the extremity of the dactylos. The coxal joint is 

 short and broad, and supports on its anterior and outer wall 

 a small podobranchial plume. The basisal joint is long and 

 stout, the anterior margin is longitudinally concave, smooth, and 

 produced somewhat beyond its articulation with the ischium, 

 whereas the posterior margin is convex and adorned with 

 three rather large fasciculi of short, stiff, and simple hairs. 

 The ischium is a little shorter than the basis and about half 

 its diameter in breadth ; it is smooth on the upper or anterior 

 surface and thickly studded with short, simple, and rather 

 stiff hairs on the posterior margin. The meros is shorter than 

 the ischium, somewhat pear-shaped in form, having the nar- 

 row portion towards the ischium and the larger towards the 

 carpus; the upper or anterior margin is smooth and con- 

 vex, while the lower is smooth and waved, being concave 

 towards the ischium and convex towards the carpus; the lobe 

 and distal margin arc fringed with a few long simple hairs. 

 The carpus is subcqual in length with the ischium, cylindrical 



