OP THE 'PORCUPINE' EXPEDITIONS. 409 



inferiorly, each being larger than those on the dorsal lobe. The inferior cirrus is stout, 

 and reaches nearly to the tip of the fleshy part of the foot. 



The superior division of the foot gradually increases in size from before back- 

 ward, until it projects about as far as the inferior; and the bristles also become 

 stronger and longer, a few smooth hairs appearing in each bundle. The digit-like 

 papillse, however, diminish in number; and, as a rule, there are only two in each 

 division of the foot in the middle of the body, those of the inferior lobe being the 

 larger. Posteriorly the superior division has three of the papillse above the bristle- 

 bundle, the inferior frequently only a single large pedunculated clavate process. The 

 ventral cirrus is also reduced in size. The inferior bristles of the ventral tuft in the 

 same region have a more distinct enlargement at the distal end of the shaft (PI. LXXIII. 

 fig. 8). Anteriorly there is no branchial process ; and it is only at the twenty-fourth 

 foot that a minute one appears, which gradually elongates as we proceed backward, 

 so as to extend outward as far as the tip of the foot. 



The bristles are rather shorter and proportionally stouter than in Leanira ylileni; 

 there is no ciliated pad on the dorsal edge of the foot ; and the papillse of the latter do 

 not show the disparity in size characteristic of Leanira ylileni. The ventral cirrus is 

 also shorter, and in the preparations shows no process at the base. It diverges much 

 from Leanira tetragona in regard to the tentacle, bristles, and other parts. 



At the anterior end of a fragmentary specimen is apparently a crustacean parasite 

 immersed in the dorsal muscles. 



Leanira yhleni, Malmgren \ Dredged in 81 fathoms oflP Cape Finisterre (Station 10), 

 and in 45 fathoms off Cape Sagres, in 1870. It is a form of some size ; but none of the 

 specimens are complete. The largest fragment measures about 2 inches. 



The head has a little dark pigment in front, on each side of the base of the tentacle. 

 The latter is scarcely as long as the tentacular cirrus, and more slender ; at its base 

 are two short lamelliform processes. A pair of eyes of small size lie on each side of 

 the tentacle, and a larger anterior pair in the sulcus beneath. Two elongated taper- 

 ing palpi spring from the inferior surface, - with the usual scoop-like lamellae at the 

 base. The tentacular cirrus is about one fourth the length of the palpus. A filiform 

 process arises on the inner side below the peduncle of the tentacular cirrus, and extends 

 some distance beyond it. There are also several elongated papillae, one of which ex- 

 tends beyond the peduncle. From the basal part below the latter a series of very fine 

 bristles pass forward — very minute traces of spines being present along the edge of the 

 majority, while others, at the outer border of the tufts, show more evident spikes. The 

 bristles form two tufts; and there is a spine between them. All the tentacular processes 

 of the head are quite smooth. 



The first foot has a very short superior lobe, with about a dozen long papillse and 

 the usual bristles. The inferior division is also short, with many papillse and the pecu- 



