POLYCH^TA SEDENTARIA OF THE FIRTH OF FORTH. 669 



Sabella, Lin. 



Ventrical sulcus not continued on to the dorsum of the thoracic region. 

 Collar narrow, divided, with widely separated projecting corners dorsally, and 

 reflected ventral lobes. Fascicles of capillary chsetse commencing on the 

 collar somite, tori uncinigeri on the somite next to the collar. Uncini of the 

 anterior region in double series, of two forms, one avicular the other cuspidate 

 (PL XLIV. fig. 31 d). Branchiae connected only at the base, dorsal appendages 

 none, ocular spots sometimes present. Two tentacles, shorter than, and under- 

 neath the branchiae. 



Sabella pavonia, Sav. 



Sabetta penicillus, Lin., Syst. Nat., xii. p. 1269 (excl. syn. E-oncL, Ellis, et 

 Syst. Nat., x.). 



Amphitrite penicillus, Lam., Hist. Nat. Anim. s. Vert., 1818, v. (excl. syn. 

 Fabr. et Brug.). 



Sabella pavonia, Savigny, Syst. des AnneL Desc. de l'Egypte, 2nd. edit., 1826, 

 xxi.; Malmgren, Nordiska Hafs-Annulater; M'Intosh, Fauna of St 

 Andrews. 



Specific Characters. — Size large, 12 to 15 inches in length. Segments of 

 thoracic region 8 to 12. (In our figure 31 a, PL XLIV, the number shown, 15, 

 is incorrect.) Branchiae 35 to 45 on each side, long, thin flexible; no ocular spots; 

 white, with minute purple spots or bands at equal distances. Two grooved 

 tentacles, £th or somewhat more than ^th the length of the branchiae. 



Habits. — Tube always covered densely with fine black mud, and usually en- 

 closed in a colony of Alcyonium digitatum, which has usually a smooth surface 

 without digitate processes. We obtained it not very frequently from haddock 

 lines worked in about 30 fathoms, off the mouth of the Firth of Forth, the 

 hooks catching easily in the coating of Alcyonium. The coating of Alcyonium 

 shows that the tube projects far from the surface of the sea bottom. 



Figs. 31 b, 31 c, show longer and shorter capillary chaetae from the thoracic 

 region; figs. 31 d, the two forms of uncini. 



Laonome Kroyeri, Malmgren. 

 Laonome Kroyeri, Malmgren, Nordiska Hafs-Annulater, p. 400. 

 One specimen got in dredge on Middle Bank, October 29, 1886. 



Genus Chone, Kroyer. 



Described by Malmgren as follows : — Body somewhat round, sublinear, 

 pointed posteriorly, with the abdominal furrow very conspicuous, and continued 

 on to the dorsum of the anterior part of the body ; anus terminal ; no ventral 

 cleft ; somites divided into two by a transverse furrow. Collar adpressed to the 



