Gatty Marine Laboratory ^ St. Andrews. 65 



bends forward at the crown and backward over the some- 

 what short base. A little behind the long row of teeth on 

 the crown is a shorter row at the end of the striae which 

 pass up the neck. The anterior outline is smoothly curved 

 below the great fang, then gently extends forward to the prow 

 and below the short basal process, which is striated. The 

 chief features are the depth of the crown, the short and 

 sharp main fang, the minuteness of the serrations above it, 

 the narrowness of the neck, and the comparatively short 

 base. The posterior hooks differ from the anterior chiefly 

 in size, but the lateral row of teeth on the crown is more 

 distinct than in front. The tube is chiefly composed of a 

 horny secretion which clings tenaciously to the body of the 

 annelid in the preparation. Few grains of sand or other 

 extraneous structures are present. 



In the brilliant coloration of the branchise this form 

 approaches Sabel/a crassicornis, Sars, procured during the 

 'Valorous^ Expedition in 1875, and its collar is also similar, 

 but the presence of well-formed paired eyes differs from the 

 bold pigment-touches of the arctic species. Moreover, 

 the branchial filaments of S. nordenskioldi are short and 

 stout, and the pinnae rather short, whereas the filaments 

 of S. crassicornis are longer and more slender, and so with 

 the pinnae. The terminal processes are also longer and 

 more slender. The rich coloration of the branchiae in both 

 species is noteworthy — Sars * describing those of S. crassi- 

 cornis as banded with white and red, or often wholly red, 

 and having four or five intensely red oval spots equally 

 distant. 



Chone normani^, sp. n., was dredged by Canon Norman 

 off Finmark, and is distinguished by the great length of the 

 branchiae, which are not much shorter than the body, the 

 terminal pi'ocesses especially being greatly developed, so that 

 each resembles a linear lanceolate leaf (PL III. fig. 14) 

 with a slender midrib. The filaments bear very slender 

 pinnae which are of considerable length, and the edge of 

 each is also webbed for a considerable distance, the mem- 

 brane connecting the filaments with each other occurring 

 only below it. The body is about an inch in length, very 

 little tapered in front, but diminishing gradually to the 

 tail, rounded generally, though slightly flattened ventrally 



* Nyt. Mag. 6 Bd. p. 202 (1851). 



t Named after Canon Norman, who, for many years, has so richly 

 added to the fauna of the British and neighbouring seas, and to whose 

 courtesy with specimens I have long been indebted. 



Ann. (& Mag. N. Hist. Ser. 8. Vol. xvii. 5 



