LAGISCA JEFFREYS!!. 305 



The dorsal division in the typical foot bears a somewhat dense mass of rather short 

 pale bristles with a slight curvature. The tips are short and by no means acute 

 (Plate XXXYIII, fig. 4, representing one of the longer forms). The spinous rows are 

 much more distinct and longer than in Lagisca floccosa, and the shape of the bristle 

 differs. The ventral division has translucent bristles with moderately long shafts. The 

 tips of the superior series (Plate XXXVIII, fig. 5) are long and somewhat tapered, with 

 rather distant rows of long spines, the smooth terminal region being minutely bifid. 

 The tips gradually become shorter and stouter inferiorly (Plate XXXYIII, fig. 6), the 

 strongly curved terminal hook and the secondary process with its characteristic angle 

 of incidence being noteworthy. Some of the latter bristles show traces of an outward 

 curve between the secondary process and the first row of spines. Towards the ventral 

 border the secondary process diminishes with the general size of the bristle, but a 

 minute trace occurs in almost all. 



The dorsal bristles in most feet are densely coated with debris and minute 

 filamentous algoid growths, and in some cases the tips of the ventral are likewise 

 encrusted with a parasitic structure showing minute rods. 



This species approaches the Polynoe aspera of Hansen l from the Norwegian North 

 Atlantic Expedition, and of Theel, 2 from Nova Zembla, but differs in regard to the palpi, 

 which are smooth in the northern form, and also in the shorter tips (bare) to the dorsal 

 bristles. It may be that further examination will show they are identical. 



3. Lagisca Jefpreysii, 3 n. s. 



Specific Characters. —Length 16 mm. or more. Head more elongate than in Lagisca 

 floccosa, with blunt anterior peaks. Posterior pair of eyes just in front of the collar, 

 anterior pair somewhat further forward than in L. floccosa, and lateral in position. 

 Median tentacle absent ; lateral subulate, and slightly beneath the base of the former. 

 Tentacular cirri slender, and with a series of clavate cilia which commence only when 

 the basal third of the process is reached. Palpi have rows of minute papilla with 

 nodular tips. First scales rounded and minutely spinous, rest ovate-reniform, with a 

 distinct fold from the scar of attachment to the hilus at the anterior border, speckled 

 throughout the posterior half with pale specks as if variolated. The outer border has 

 long cilia. Dorsal bristles of moderate length, with well-marked spinous rows, and a 

 very short smooth tip. They are nearly straight, Yentral bristles with rather short 

 spinous rows, and a short bare tip with a strongly curved hook at the end, and a 

 secondary process— directed nearly straight— distally. Yentral cirrus with clavate cilia. 



Habitat— Dredged in sixty fathoms, nine miles off Balta, in 1868, by Dr. Gwyn 

 Jeffreys. 



1 'Nat. Mag. f. Naturvid./ 24, p. 4, 1877, and < Norsk. Nordh. Exped.,' vii, p. 5, pi. ii f 11— 

 15, 1882. 



2 < Annel. N. Zemb./ p. 10, pi. i, f. 1—4, 1879. 



3 After the late Dr. Gwyn Jeffreys, a veteran explorer of the Zetlandic seas. The name was 

 formerly given to the succeeding species— now associated with P. extenuata, Grube. 



