198 Dr. W. C. M^Intosli on the 



Fam. 10. SyUidsB. 



Genus AuTOLYTUS, Grube. 



Autolytus proUfer^ O. F. Miiller ; Mgrn. op. cit. p. 32. 



; uncommon nea 

 ranging to deep water. 



Not uncommon near low-water mark under stones, and 



Autolytus [Procercea) pictus^ Ehlers, Die Borstenwurmer, 



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, CErst. {Sphcerosylh's) . 



Exogone naidina, CErst. (?), Archiv f. Naturg. xi. 1845, 



p. 20, Taf. 2. 

 Occasionally under stones in rock-pools. 



Genus Syllis, Savigny. 

 SylUs armillaris^ O. F. Miiller ; Mgrn. op. cit. p. 42. 



Frequent between tide-marks under stones and in the 

 laminarian region. 



Genus " loiDA," Johnst. 



'■'■loida macroplitlialma^'' 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 pelagica, L. ; Mgrn. op. cit. p. 47. 

 Everywhere abundant from high -water mark to the coralline 

 ground, and in the stomachs of many fishes. 



