GENETYLLIS LTITEA. 95 



The dorsal cirri are large, more or less vertical, partly covering the dorsum and the feet, 

 though to a less extent than in the previous genus. The inferior cirrus, which is behind 

 the bristles, is vertical. Both are less developed than in Notophyllum. Bristles compound, 

 more slender than in the latter, but conforming to the same type. The dorsal spine and 

 scanty bristles of the former genus have disappeared. 



This is placed by Grube (1879) under the Phyllodocidas proper, and not with the 

 Eulalia-group. Segment 2, like segment 3, smaller than the peristomial segment and 

 with two tentacular cirri. Levinsen observes that the eyes and the nuchal appendages 

 are large whilst the dorsal cirrus covers the foot. 



In Genetyllis ocidata of the ' Challenger ' the oblique muscles not only pass down by 

 the sides of the nerve-cords, but certain fibres, probably from the vertical, pass above 

 them to the opposite side. The great ventral spine in this form is black. 



1. Genetyllis lutea, Malmgren, 1865. Plate LXVIII, figs. 18 and 19— feet; Plate LXX VII, 



fig. 13 — bristle. 



Specific Characters. — Head rounded — ovate, with two nearly circular black eyes of 

 variable size. Tentacles subulate and tapered. The tentacular cirri also have finely 

 pointed tips. Ventral surface of the prostomium bipapillose with a smaller posterior lip 

 than in Notophyllum. Body linear with transverse lines in each segment. The superior 

 division of the foot carries a somewhat reniform cirrus, or rather a lamella almost semi- 

 circular anteriorly with the inner edge reduced, broadly reniform, but with a dorsal 

 peak, and with projecting inner lappets in the middle of the body. The spinigerous 

 region is bluntly conical, bears a yellow spine, and has more slender bristles than in 

 Notophyllum, the distal end of ,the shaft being dilated and obliquely striated, with a series 

 of spikes on the ridge. The terminal blade is of moderate length, obliquely striated, curved, 

 finely tapered, and the edge is minutely serrated. The ventral cirrus is obovate with a 

 slight peak superiorly, and is soldered to the posterior surface of the foot by its inner 

 edge. The colour in life is stated to be fine yellow. In spirit it is a dull yellow. 



Synonyms. 



1865. Genetyllis lutea, Malmgren. Nord. Hafs-Annul., p. 93,, Tab. xiv, f. 32. 



1867. „ „ Idem. Annul. Polych., p. 20. 



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



1874. „ „ Idem. Ann. Nat. Hist., ser. 4, vol. xiv, p. 196. 

 „ „ „ Malm. Op. cit. Groteb., p. 79. 



1875. „ „ Mcintosh. Invert, and Fishes St. Andrews, p. 119. 

 1879. „ „ Tauber. Annul. Danic, p. 86. 



1883. „ „ Levinsen. Yidensk. Meddel. Foren. Kjobenh., p. 205. 



1893. „ ,, Idem. Vidensk. ud. "Hauchs," p. 326. 



1901. „ „ Mcintosh. Ann. Nat. Hist., ser. 7, vol. viii, p. 223. 



Habitat — From the deep sea fishing boats, St. Andrews (E. M.) ; in 100 fathoms, 

 St. Magnus Bay, Shetland, and off the Hebrides (Dr. Grwyn Jeffreys). 



