POLYCH^TA SEDENTARIA OF THE FIRTH OF FORTH. 665 



ScAone maculata (Dalyell). 



TerebeUa maculata, Johnston, Cat. Brit. Mus., p. 240; Dalyell, Pow. 

 Creator, ii. p. 203. 



We have placed this species in Malmgren's genus Scione, because it has 

 16 pairs of setigerous tubercles, and only one pair of branchiae. Our specimens 

 agree closely with Malmgren's Scione lobata, but that in ours there are 

 numerous ocelli behind the tentacles, while Malmgren's generic diagnosis 

 includes the words " oculi nulli." The species agrees with lobata, in having a 

 lateral semicircular lobe projecting on each side from the 3rd somite, the one 

 immediately behind the branchiferous. These lobes are evidently the " pair of 

 short, obtuse, pellucid stumps not distinguished by obvious peculiarities," 

 mentioned by Dalyell. We have no doubt that our specimens are of the 

 species TerebeUa maculata as described by Dalyell, and it is extremely probable 

 that that species is really a synonym of Scione lobata, Malmgren. The chaetae 

 are limbate, with an entire point ; the uncinus has two secondary teeth above 

 the principal one. The tentacula are few in number, and in the living animal 

 spotted. Round the anus are 6 or 7 conical papillae (PI. XLIV. fig. 27). 



Habits. — We dredged several specimens, Nov. 11, 1886, on the E-ost, north 

 of Inchkeith, in 7 or 8 fathoms; bottom, shells, stones, and black muddy sand. 



Genus Thelepus, Malmgren (R Leuckart, 1849). 



The two distinguishing features of this genus, as defined by Malmgren, are 

 the presence of fascicles of capillary setae throughout the whole length of the 

 body, and the presence of numerous filiform branchiae, arising separately in a 

 transverse series on each side, in two of the anterior somites. 



The genus was named by R. Leuckart {Arch. f. Naturges., xv. 1), who 

 founded it on a fragment containing only a few of the posterior segments of a 

 single specimen. Leuckart believed his specimen to form both a new species 

 and a new genus. Malmgren retained the generic name, but identified the 

 characters of the species with those given by previous authors, under other 

 names. 



Thelepus circinnata, Malmgren (Fabr.). 



Amphitrite circinnata, Fabr., Fauna Grcenl., p. 286. 



TerebeUa conchilega, Dalyell, Pow. Creator. 



Thelepus circinnata, Mgn., Nordiska Hafs-Annulater. 



Thelepus circinnatus, M'Intosh, Fauna of St Andrews ; Leslie and Herdman, 



Inv. Fauna of the Firth of Forth. 

 Venusia pmtctata, Johnston, Cat. Brit. Mus. 



Specific Diagnosis. — That of the genus. 



Description. — The filiform branchiae are borne on the first two somites 



