436 PHOLOE. 



have whorls of spikes on the distal region of the shaft and tapering extremities (Plate 

 XLII, fig. 21), the stoutest being next the spine, and the more slender forms with spines 

 at the distal end of the shaft occurring at the ventral border. 



The superior lobe gradually increases in size until, in the typical foot (Plate XXXI, 

 fig. 12), it projects about as far as the ventral, and the bristles become stronger and 

 longer. A few smooth hairs occur in each bundle. The digit-like papillas, however, 

 diminish in number as a rule, only two occurring in each division of the foot in the 

 middle of the body, those of the inferior lobe being the larger. Posteriorly (Plate 

 XXXI, fig. 13) the superior division has three or four 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 series of the same 

 region have a more distinct enlargement at the distal end of the shaft (Plate XLII, 

 fig. 22). 



]STo branchial process occurs until the twenty-fourth foot, and then it is minute. 

 Posteriorly it gradually elongates, so as to extend outward as far as the tip of the foot. 



The bristles are somewhat shorter and proportionally stouter than in Leanira 

 Yhleni, Mgrn.; no ciliated pad exists on the dorsal edge of the foot, and the papillas of 

 the latter do not show the disparity in size characteristic of L. Yhleni. The ventral 

 cirrus is also shorter, and in the preparation shows no process at the base. 



The species diverges from L. tetragona in regard to the tentacle, bristles, and other 

 parts. 



Habits. — A deep-water species. 



At the anterior end of a fragmentary specimen a crustacean parasite was fixed in 

 the dorsal muscles. 



Bhlers gives a detailed description l with figures of this species, his largest example 

 being only 19 mm. long. He shows the tentacle of three segments, or at least it is thus 

 figured and described. Eyes absent. He adds nothing novel to the description in the 

 * Transactions of the Zoological Society.' He observes that the species approaches the 

 L. Quatrefagesi of Kinberg from the Atlantic, off the La Plata. 2 A more minute 

 investigation of Kinberg' s specimen, indeed, is necessary before all doubts as to the 

 specific separation are removed. They closely agree in regard to the structure of the 

 scales, bristles, and general condition of the head and its processes, and seem to differ 

 chiefly in the structure of the feet and in the absence of eyes in the British form. 



Genus XXVIII. — Pholoe, 3 Johnston, 1839. 



Head furnished with a single short median tentacle. Two pairs of eyes, more or 

 less connate. Body linear-oblong. Scales on alternate segments in the anterior part of 



lf Zeitsch. f. w. Zool./ 1875. 



2 ' Freg. Eugen. Resa/ p. 30. 



3 Carus, in the c Prodromus Faunas Mediterraneaa/ includes this genus under the sub-family 

 SigalioninsD, Pholoe being characterised by having a linear-oblong body, elytra on alternate segments 



