POLYCH^TA SEDENTARIA OF THE FIRTH OF FORTH. 673 



Filigrana implexa, Berkeley. 



Filograna implexa, Berkeley, Zool. Journ., v. p. 427; Sars, Faun. Litt. 



Norv., i. p. 86; Malmgren, Annulata Polych.; M'Intosh, Fauna of 



St Andrews. 

 Protula Dysteri, Huxley, Anatomy of Invertebrates, 1871. 



A large mass of the tubes of this species was obtained from Newhaven 

 fishermen ; it was brought up on haddock lines, some distance outside the 

 May. We dredged a number of masses of the tubes, with the worm living 

 within them, on the Host, November 1, 1886. 



Johnston mentions no specimens of Huxley's Protula Dysteri, the descrip- 

 tion of which he quotes, and there is nothing in that description to differentiate 

 the worm from Filograna implexa, of which Johnston gives the characters from 

 his own examination of specimens from Devonshire. Our identification of the 

 two names is made on the authority of Professor M'Intosh. Our figure of the 

 larva was taken from some which were found among living specimens of the 

 worm (PI. XLV. fig. 35). 



Genus Pomatocerus (Phil.). 



Branchiae with many branches in each tuft ; opercular tentacle thick, with 

 two processes near the upper end. Tube entirely adherent, white, with a 

 distinct keel on its upper surface, and a spine over the aperture. 



Pomatocerus triqueter, L. Morch. 



Serpula triquetra, Sars, Reise, 1849; Danielssen, Reise, 1857. 

 Pomatocerus triqueter, Morch, Revisio critica Serpulidarum Natur. Ticlskr., 



3 R. 1 B., 1863; Malmgren, Ann. Polych.; M'Intosh, Fauna of St 



Andrews. 

 Vermilia triquetral, Philippi, in Ann. and Mag. Nat. Hist., xiv. 156, pi. iii. 



f. F.; Grube, Fam. Annel., 92. 

 Serpula conica, Johnston, Cat. of Worms in British Museum. 



Very abundant everywhere, attached to rocks, stones, and shells. 



Colour deep rich blue on the thorax, abdomen red in the females, and 

 whitish in the males when sexually mature ; branchiae barred, and spotted with 

 deep brown, blue, orange, white, and sometimes red. The distribution of the 

 colour is subject to considerable variation. Capillary setae in thorax curved, 

 limbed, and finely pointed ; those of the abdomen with the limb immensly 

 expanded on one side, and serrated ; uncini with ten points, and the manubrium 

 all but obsolete (PI. XLV. fig. 36). 



