NEPHTHYS CILIATA. 25 



1886. Nephthys ciliata, idem. Ann. Kara-Hav. Led., p. 8. 



189 °- „ „ Malaquin. Eev. Biol, du Nord Fr., p. 32 (Annel. Boulon.). 



1^93. „ „ Levinsen. Vidensk. Ud. " Hauchs," p. 337. 



1898. „ „ Micliaelsen. Zool. Ergebn., ix, G-ronl. Annel., p. 126. 



1900. „ „ Fauvel. Annel. Cherbourg, Mem. Soc. nationale des Sc. nat., etc., Cherbourg, 



tome xxxi, p. 309 et seq. 

 „ „ „ Mcintosh. Ann. Nat. Hist., ser. 7, vol. v, p. 258. 



1901. „ „ idem. Ibid., vol. viii, p. 222. 



» >, „ Whiteaves. G-eol. Surv. Canada, No. 722, p. 82. 



1902. „ „ Marenzeller. Polych. des Grundes, Denkschr. d. K. Akad. d. Wiss., Wien, 



lxxiv Bd., sep. abdr., p. 11. 



1903. „ „ Moore. Polych. Japan, Proc. Acad. Nat. Sc. Philad., June, 1903, p. 433. 



Habitat — Bressay Sound, 10 fathoms; St. Magnus Bay, 90 — 100 fathoms; generally 

 on muddy ground or in sandy mud. 



O. F. Miiller procured it in the first instance from the Faroe Islands, and it stretches 

 to Greenland and the eastern Canadian waters as well as to America. 



Malmgren gives Spitsbergen, Scandinavia, and Iceland, and Ehlers the European 

 and American shores of the North Atlantic (Verrill). Kara Sea, Nova Zembla 

 (Theel). 



The most abundant Norwegian species collected by Canon Norman; Behring's Sea 

 (Marenzeller) . 



Head longer than wide, with a broad and slightly convex anterior border and 

 more slender tentacles than in K cseca, the anterior being lateral in position, the posterior 

 ventrolateral. 



The peristomial segment shows the dorsal and ventral spine-papillae and the two kinds 

 of bristles in each. 



Proboscis. — In extrusion the terminal papillae are more slender and elongated than in 

 2V. cseca or N. Hombergii, and the body of the organ therefore is generally more papillose. 

 There are about five papillae in each row, the anterior being longer and more slender 

 than in the common species. Moreover, shorter papillae are dotted over the organ almost 

 to the base. In the median line dorsally a long slender anteriorly directed cirrus occurs 

 a little in front of the other rows. 



Body slightly tapered in front, more so posteriorly, and terminating in a caudal 

 cirrus. 



The typical foot (Plate LXVI, fig. 9) is distinguished from that of N. cseca by the fact 

 that the superior lamella is smaller and more rounded, its greatest vertical diameter being 

 towards the middle, and the axis directed dorsally (upward), whereas the greatest vertical 

 axis in N. cseca is directed obliquely outward. The slight development of the lamellae, 

 indeed, at once differentiates the species. The dorsal lamella is continued to the tip of the 

 foot where the edge bends downward, and its tissue becomes continuous with that of the 

 dorsal cirrus and branchia. The dorsal cirrus at the base of the branchial process is 

 rather slender and long. The branchial process is of average length, though in some it is 

 short. Immediately in front is the spinigerous region of the foot which has the peculiarity 



61 



