564 Notes from the Gatty Marine Laboratory . 



Ill a note on the synonymy of this species Dr. Willey * 

 appears to think that because the " so-called " Notoc'irrus 

 tricolor \ya.s mentioned in the ' Challenger^ volume, it wa? so 

 in continuation of the mistaken identity (by Prof. Ehlers) of 

 this form \^ith the author's Notucirrus scoticus. That is a 

 misapprehension. The species Tvere described as distinct. 



The relationship of this form to Delle Chiaje'sf Lumbricus 

 Saint-Hilarii appears to be close. It is noteworthy that the 

 four rows of spots were not evident in the specimens from 

 the Channel Islands, so that variation may exist. 



Though Schmarda's description J oi Not o cirrus as applied to 

 Lumbriconereids with a dorsal process may be open to doubt, 

 yet the title may be conserved for the type for which it was 

 used in 1869, not long after the publication of Schmarda's 

 work, viz. Nofocirrus scoticus, M*I. §j which requires generic 

 separation from allied forms. The genus is characterized by 

 the conical head, with a pair of eyes placed quite at the 

 posterior border. The body is slender, long, tough, and 

 almost moniliform in outline. The feet are short, with a 

 small conical dorsal process (branchial in function). The 

 setigerous region bears simple bristles with short tapering 

 tips and broad wings which are serrated on the edge, and 

 one or two powerful spines with simple slightly tapered tips. 

 The dental apparatus has small, toothed, and modified 

 maxillce posteriorly, and in front a series of three other 

 dental plates with recurved hooks. The mandibles are 

 irregularly wedge-shaped. 



The third species is Notocirrus scoticus, MT., first pro- 

 cured in the tenacious grey mud of Lochmaddy, and subse- 

 quently in various parts of the Hebridean seas. Its conical 

 head has two eyes at the posterior border; the body is 

 about 3 inches in length, firm, and frequently almost 

 moniliform. The typical foot has a small dorsal lobe, in 

 which is a single vascular loop. The setigerous region is 

 supported by two strong spines, and the brittle bristles have 

 comparatively short, broadly winged tips, boldly serrated at 

 the edges. 



In his account of the Annelids of the 'Challenger' dredged 

 at a greater depth than 500 fathoms ||, Ehlers considers that 

 this form is identical with the Notocirrus tricolor of Johnston; 

 but this is a misapprehension, since the two forms are widely 



* Joui-n. Mar. Biol. Assoc, N. S. vi. p. 98 (Jiilyl900). 

 t Claparede, Ann, Chet. Nap. p. 150, pi. ix. Us". 4. 

 % Wirb. Thiere, i., ii., p. 116 (IbGl). 

 § Trans. R. S. E. vol. xxv. p. 417, pi. xvi. fig. 17. 

 II Zeitsch. f. w. Zool. xxv. p. oo. 



