198 Dr. W. C. M'Intosh on the 



Fam. 10. Syllidae. 



Genus Autolytus, Grube. 



Autolytus prolifer, O. F. Miiller ; Mgrn. op. cit. p. 32. 



Not uncommon near low-water mark under stones, and 

 ranging to deep water. 



Autolytus [Procercea) pictus, Ehlers, Die Borstenwiirmer, 

 i. p. 256, pi. 11. f. 8-17. 



Occasionally under stones in tide-pools. This form also 

 appears to show alternation of generations. 



Genus Eusyllis, Mgrn. 



Eusyllis tubifex, Gosse (?) ; M'Intosh, Trans. Roy. Soc. Edinb. 



vol. xxv. 2. p. 414. 



Abundant on laminarian blades cast ashore by storms. 



Genus ExOGONE, G3rst. ( Splicer osy His) . 



Exogone naidma, (Erst. (?), Archiv f. Naturg. xi. 1845, 



p. 20, Taf. 2. 



Occasionally under stones in rock-pools. 



Genus Syllis, Savigny. 

 Syllis armillaris, O. F. Miiller ; Mgrn. op. cit. p. 42. 



Frequent between tide-marks under stones and in the 

 laminarian region. 



Genus " Ioida," Johnst. 



"Ioida macrophthalma" Johnst. Cat. Brit. Mus. p. 197, 



pi. 14 a. f. 5. 



Occasionally between tide-marks. This is the sexual bud 

 of a Syllis. Four or five of the segments anteriorly are devoid 

 of the long bristles. 



Fam. 11. Nereidae. 



Genus Nereis, L. 

 Nereis pelayica, L. ; Mgrn. op. cit. p. 47. 



Everywhere abundant from high -water mark to the coralline 

 ground, and in the stomachs of many fishes. 



