OF THE 'PORCUPINE' EXPEDITIONS. 407 



inferior, with long delicate bifid tips. All are very delicate and translucent, and 

 the basal region of the terminal process is often wrinkled. The appearance of the 

 bristles varies (as usual) with their position. The ventral cirrus extends nearly as far as 

 the tip of the fleshy part of the foot. 



EusTHENELAis HIBEKNICA, n. s. Dredged in 106 fathoms in 1862, on Station 8, off' 

 the west coast of Ireland, and in 45 fathoms off' Cape Sagres in 1870. 



The form is allied to Leanira, but distinguished by having the inferior group of the 

 ventral bristles bifid. 



The head is eyeless in the spirit-preparations. Tentacle rather longer than the ten- 

 tacular cirri, and with two minute processes at the base. Pal^ii of the usual elongated 

 form, with a scoop-like sheath at the base ; the peduncle of the tentacular cirrus bears 

 four processes besides the bristles. The tentacular cirrus proper is external (dorsally), 

 and somewhat less than the tentacle. A smaller process lies within, its filiform 

 tip being shorter than the former. Beneath are two processes — an inner, short 

 and somewhat blunt, with the tip extending a little beyond the peduncle, and 

 another slender subulate process nearly half the length of the tentacular cutus. 

 The long slender bristles are directed forward and inward. All the scales are 

 absent. 



The dorsal lobe of the foot has long papillae at the tip, and finely serrated bristles, of 

 the usual character (a series more distinctly, another more minutely spinous) ; the inferior 

 division carries also long papillae, slightly diminished at the tip. The superior ventral 

 bristles have rather slender shafts, and the distal ends are furnished with from six to nine 

 whorls of spikes. The tips are long jointed processes ending in a capillary termination — 

 resembling those of Sthenelais or Sigalion rather than Leanira, since the necklace-like 

 canaliculi are absent (PI. LXXIII. fig. 4, the figure representing one of those next the 

 superior lobe of the foot) ; the serratures on the tip of the shaft are more numerous in 

 this kind, but the jointed extremities are much shorter. The segmentation of the tip is 

 faint and widely distant. The basal segment is fully one third the length of the process. 

 In the stouter bristles below, the ends of the shafts are smooth, and the divisions of 

 the terminal process shorter. The slender group at the ventral border have a slightly 

 enlarged tip, obscurely bifid (PL LXXIII. fig. 5). The character of these bristles also 

 leans to the two forms previously mentioned, and not to Leanira. A few of the inferior 

 group of ventral bristles present one or two spines at the end of the shaft. The dorsal 

 cirrus (branchia 1) is short anteriorly, but gradually increases in length till about the 

 middle of the body. There is a single large ciliated pad on the dorsal edge of the foot, 

 and about three smaller pads in the curve below the cirrus. The ventral cirrus is long 

 and subulate, reaching almost to the tip of the foot ; as usual, it is longest on the first 

 foot. 



