426 EUSTHEXELAIS HIBERNICA. 



Synonym. 

 1876. Eusthenelais hibemica, n.g. and s., Mcintosh. Trans.. Zool. Soc., vol. ix, p. 407, pi. Ixxiii, ff. 4 and 5. 



Habitat— Dredged in the 'Porcupine' Expedition of 1869 at Station 8, off the 

 west coast of Ireland (Galway) in 106 fathoms, and again in the Expedition of 1870 off 

 Cape Sagres in the Mediterranean, in 45 fathoms. 



Head (Plate XXIX, fig. 5) as in Sthenelais Jeffreysii, broadly ovate, with a median 

 region and two well-marked ovoid lobes at the sides. Eyeless in the preparations. The 

 median tentacle is similar to that of the species mentioned, and has a filiform tip. At its 

 base are two small processes (ctenidia), which do not reach to the tip of the basal 

 segment. The appendages springing from the first foot agree with those of Sth. 

 Jeffreysii. The external process, corresponding to the dorsal cirrus, is slightly shorter 

 than the median tentacle, and has a filiform tip. The shorter and more slender lateral 

 tentacle lies to the inner border dorsally. Beneath are two processes,— an inner, short, 

 broad, and blunt (cuilleron), with the flattened tip extending beyond the peduncle; and 

 an outer, slender, tapering, ventral cirrus, which is not half the length of the dorsal. 

 The palpi are long, smooth, and tapering, with a scoop-shaped lamella at the base 

 superiorly and internally. 



Body probably about two inches in length, and having numerous segments. It is 

 rounded dorsally and flattened ventrally. 



Scales absent. In all probability the scales will be found to present long papillae on 

 their external border — if we may judge from its close resemblance to Sthenelais Jeffreysii 

 and its Norwegian ally, as well as to Sth. fuliginosa, Claparede. 1 



Feet. — The second foot bears a scale and a long ventral cirrus, and the third a 

 dorsal cirrus of considerable length, while the fourth has a branchial process arisinp 

 from the homologous base. The bristles in the second foot have already mapped them- 

 selves out more or less as they occur behind, though of course less distinctly. The 

 branchia is short anteriorly, but gradually increases in length till about the middle of the 

 body. A single large ciliated pad (ctenidium) exists on the dorsal edge of the foot, and 

 three smaller in the curve below the cirrus. In the typical foot (Plate XXXI, fig. 9) the 

 dorsal lobe is somewhat clavate, and bevelled at the tip superiorly. It bears three or 

 four long papillse. The dorsal bristles are slender, elongate, and tapered to a fine hair- 

 like point. All are finely spinous, one series more distinctly, and another less distinctly 

 so. The ventral lobe is conical at the tip, has a rounded lobule in front, bearing 

 a very long papilla, which extends beyond the tip of the dorsal lobe. At the spine is 

 another somewhat fusiform papilla, and on the inferior lobule a longer and more slender 

 one. The superior ventral bristles have rather slender shafts, and the distal ends are 

 furnished with from seven to nine whorls of spikes. The distal region is a slender 

 tapering process of from fifteen to eighteen joints, ending in a capillary tip. These 

 resemble the bristles of Sthenelais and Sigalion rather than those of Leanira, since the 

 necklace-like canaliculi are absent. The figure (Plate XLII, fig. 9) represents a bristle 

 adjoining the superior lobe, the spinous rows on the tip of the shaft being more numerous, 

 while the jointed terminal region is shorter. 



1 ' Ann. Cha3t. Nap./ p. 94, pi. iv, ^g. 2. 



