EUSTHENELAIS HIBERNICA. 425 



claw. Then follow a large fan-shaped group of most slender bristles, with a few spines 

 at the tips of the slightly curved shafts, and long (six- to eight-) jointed hair-like tips. 



The ventral cirrus is long and subulate, and its tapering tip reaches to the apex 

 of the ventral lobe. 



As far as can be observed this is the nearest approach to Leanira, only the more 

 slender forms of the stouter series of bristles in the ventral division showing very finely 

 bifid extremities. Unfortunately the condition of the single specimen leaves much to be 

 desired. 



Genus XXV.— Eusthenelais, Mcintosh, 1876. 



Characters as in 8the?ielais, but the scales are unknown. Dorsal bristles slender, 

 elongate, and finely spinous, tapering to a hair-like point. Upper ventral bristles 

 slender, the distal end of the shaft having seven to nine whorls of spikes, and a terminal 

 tapering process of fifteen to eighteen articulations ending in a hair-like tip. The 

 stouter bristles at and below the spine have shorter divisions to the terminal whip. The 

 slender group at the inferior edge has long (fifteen- to eighteen-) jointed terminal processes 

 with a minutely bifid tip. 



EUSTHENELAIS HIBERNICA, Mcintosh, 1876. 



Specific Characters. — Head broadly ovate, with a median region and two well-marked 

 ovoid lobes at the sides. Eyeless in the preparations. Median tentacle similar to that of 

 Sthenelais Jeffrey sii, with a filiform tip. At its base are two small processes (ctenidia) 

 which do not reach the tip of the ceratophore. The appendages springing from the 

 first foot agree with those of the species mentioned. The dorsal cirrus proper (external) 

 is slightly shorter than the median tentacle, and the tip is filiform. The shorter and 

 more slender lateral tentacle lies to the inner border dorsally. Beneath are two pro- 

 cesses ; an inner, short, broad, and blunt (cuilleron) ; and an outer, slender, tapering, 

 ventral cirrus, less than half the length of the dorsal. Palpi long, smooth, and tapering, 

 with a scoop-shaped lamella at the base superiorly and internally. Body about two 

 inches long, with numerous segments. Scales absent. Dorsal lobe of the foot some- 

 what clavate, and bevelled at the tip. It has three or four long papilke. The bristles 

 are slender, elongate, finely spinous, and tapered to a hair-like point. Ventral lobe 

 conical, with a rounded lobule in front bearing a long papilla — stretching 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 papilla. Upper ventral bristles with slender 

 shafts, the distal region having from seven to nine whorls of spikes, while the terminal 

 tapering process has from fifteen to eighteen articulations. Near the spine are bristles 

 with stouter shafts, devoid of spines distally, and with shorter divisions in the terminal 

 process. The slender inferior series have in some a few spines on the end of the shaft, 

 and a numerously jointed (fifteen to eighteen) bifid tip. Ventral cirrus long and subu- 

 late, almost reaching the tip of the fleshy part of the foot. 



