396 ACHOLOE. 



rather small ; two in front of the nuchal collar, and two on the lateral cephalic promi- 

 nence. Lateral tentacles short, subulate. Palpi thick, subulate. Tentacular cirri about 

 the length of the palpi in spirit. All these cephalic appendages are smooth. 



Body. — Much elongated, narrow, of about 100 segments, and about 65 mm. long. 

 Segmental papilla distinct (fide Malmgren). 



Scales. — Fifteen pairs, minute, subcircular, pellucid, smooth, leaving the posterior 

 region of the body uncovered (fide Malmgren). 



Feet. — The feet are rather elongate, carrying dorsally a minute tuft of slender hairs, 

 finely serrated (Plate XLI, fig. 9). The ventral bristles are described by Malmgren as 

 of one kind only, but this form shows two kinds, viz. (1) that indicated by Malmgren, and 

 represented in Plate XLI, fig. 10, the rows of spines in all the examples being apparently 

 less numerous and wider apart than in Malmgren's figure ; and (2) a few with character- 

 istically hooked tips and a secondary process beneath (Plate XLI, fig. 11). The rows of 

 spines in the first series are not opposite, but alternate — as observed in end views 

 (Plate XLI, fig. 12). A slight enlargement occurs at the commencement of the spinous 

 region. 



All the bristled segments, as in P. scolopendrina, are furnished with smooth dorsal 

 cirri, which extend only a little further than the bristles. Ventral cirrus subulate, of 

 moderate length, sparsely ciliated. 



The appearance of this northern form only in the stomachs of fishes shows how 

 readily such may escape the various instruments of capture used by naturalists. 



I have placed this under Malmgren's genus and species, supposing that he had 

 overlooked the ventral bristles with the bifid tip. Should they be absent in his form, 

 then the species from St. Andrews should bear the specific name of Elisabeths, from its 

 discoverer. 



Kupffer (1873) shows that the antennas are three-ringed in examples from the 

 Baltic, but this and other features require careful re-investigation in connection with 

 possible specific differences. 



Genus XXII. — Acholoe, 1 Claparede, 1870. 



Head elongated from before backward, and running into the bases of the tentacles. 

 Xo peaks. Four large equidistant eyes. Palpi smooth and short. Body sublinear, 

 flattened, segments numerous. A segmental eminence but no distinct papilla. Cirri on 

 every foot, and a T-shaped branchial process. Scales numerous. Feet short. Dorsal 

 division minute ; bristles few and small, with a minute hook at the tip. Ventral division 

 bearing bristles with long and strong shafts and short spinous regions having a sharp 

 hook at the tip. The nerve-cords seem to be comparatively large, ovoid in section, and 

 have the cuticle and granular epiderm externally. Internally a firm membrane separates 

 them from a well-marked layer of longitudinal muscular fibres in the median line, as in 

 Po lyn oe scolopen drin a . 



1 One of the Harpies. 



