72 ANAITIS KOSTERIENSIS. 



dotted with red grains, and throughout these have a tendency to be arranged in transverse 

 bars or streaks. The general tone of the rest of the body and of the lamellas is pale buff. 

 Besides the latter hue the ventral surface shows a rose-red band from the line of the first 

 tentacular cirrus to that of the first foot, so that when the animal rests on the side of the 

 glass vessel it closely resembles the abundant Nemertean Amphiporus lactifioreus, Johnston 

 — with its reddish ganglia. 



The superior division of the foot (Plate LXVIII, fig. 10) has a prominent pedicle 

 carrying a lanceolate cirrus which thus projects from the body. 



The inferior division is slightly emarginate, and has a spine and a series of pale 

 bristles with rather slender shafts and enlarged distal ends — spinulose along the terminal 

 curves (Plate LXXVII, fig. 10). The terminal tapering blade is elongate and finely 

 serrated along the edge, and the stria3 on it slope from the point and edge downward 

 and backward. The ventral cirri are also lanceolate, but much more acutely pointed, 

 and project beyond the tip of the bristle-bearing process. 



That so beautiful a species should for a considerable part of its life inhabit the sand 

 is one of those curious features so difficult to explain on any modern theory of coloration. 



The Anaitis lineata of Claparede l (1870) from Naples has certain resemblances to 

 this species in general structure if not in coloration. 



2. Anaitis kosteeiensis, Malmgren, 1867. Plate LVIII, fig. 6 — head; Plate LXVIII, 

 figs. 14 and 15— feet; Plate LXXVII, fig. 11— bristle. 



Specific Characters. — Head somewhat rounded in spirit; eyes of considerable size. 

 Tentacular cirri comparatively short and with finely tapered tips. Body apparently rather 

 short and broad as well as soft, tapered more posteriorly than anteriorly. Foot with a 

 broad and massive pedicle which bears the cordate and foliaceous cirri. The setigerous 

 region forms a short cone with a bifid tip. Bristles with a comparatively small distal 

 enlargement, which is split by the insertion of the terminal blade — with a spine on each 

 side. The ventral cirrus is elliptico-subacuminate, and its tip projects considerably 

 beyond the spinigerous regions. 



Synonyms. 

 1867. Anaitis ~kosteriensis , Malmgren. Annul. Polych., p. 142. 

 1869. „ „ (?) Mcintosh. Rep. Brit. Assoc. (1868), p. 337. 



1874. „ „ Malm. Op. cit., G-oteb., p. 79. 



Habitat. — Dredged during the 'Porcupine' Expedition of 1869 off Bundoran in 

 Donegal Bay in 20 — 35 fathoms. 



Malmgren's sole specimen was procured from the Island of Koster, Sweden. 



Head (Plate LVIII, fig. 6) somewhat rounded in spirit, with two eyes of consider- 

 able -size. Tentacles absent. Tentacular cirri comparatively short and with finely 

 tapered, almost capillary, tips, the anterior apparently having the usual proportion to 

 the posterior. 



1 c Annel. Nap., Suppl./ p. 94, pi. ix, f. 4. 



