W. C. M'INTOSH ON BRITISH ANNELIDA. 387 



area. The aspect of the dorsum is greenish brown. The tentacle is madder brown. 

 The fifteen pairs of scales have brownish pigment toward the inner edge; and in 

 the centre of each is often a yellowish speck, best marked posteriorly. The cirri 

 are very finely tapered. The dorsal branch of the foot bears a series of bristles with 

 very distinct spinous rows (PI. LXX. fig. 1), with a short tip, the ventral edge show- 

 ing a difi'erentiation as in the figure, which represents one of the stouter examples ; 

 the more slender forms have the spinous rows even more widely separated. The ventral 

 division has superiorly bristles with long bifid tips (PI. LXX. fig. 2), the latter, as usual, 

 becoming shorter and stouter in the inferior series (as in fig. 3 — from the middle of the 

 tuft). A few at the ventral edge have simple tips, without the secondary process. In a 

 large example from Herm the tubercles on the scales are most conspicuous clavate organs, 

 very much more developed than Malmgren shows ; they are pyriform, with tubercles 

 on the summit. A large specimen, again, dredged by Dr. Gwyn Jeffreys off Valentia 

 had no tubercles on the scales. There is, indeed, considerable variation ; for some of 

 those from Herm have shorter cilia on the scales with more distinctly globular heads, 

 and the dorsal bristles are smaller. The entire animal has a rougher aspect than 

 H. wiiricata, and is much more lively and active, as well as more irritable, frequently 

 breaking in pieces if molested. It is a graceful species from its taper form and the 

 long caudal styles. The Polyno'e reticulata of Claparede' is in all probability this 

 form ; and the Polyno'e spinifera of Ehlers is closely allied, 



L^NiLLA SETOsissiMA,' Savigny^ This would appear to the Polyno'e longisetis of 

 Grube' (and, as such, mentioned in the Trans. R. Soc. Edin. vol. xxv. pt. ii. p. 408, 

 pi. 15. fig. 3), the Harmotho'e malmgreni, E. R. Lankester, and the Loenilla glabra, 

 Malmgren*. The P. Icevigata of Claparede^ is probably the same form. It occurs 

 generally round the British shores. The ventral bristles are suflaeiently characteristic 

 when contrasted with those of H. imlricata. The dorsal are also much longer, have 

 closer rows of spines, and a difierently formed smooth tip. Savigny indicates most of 

 the characters, slich as the much larger anterior eyes and the light golden bristles ; 

 and M. de Quatrefages makes the diagnosis more evident by finding bifid inferior 

 bristles in a large specimen. 



Antinoe finmaechica, Mgrn. Dredged off the west coast of Ireland in the ' Porcupine ' 

 Expedition of 1869. 



Hermadion absimile, n. s. First found at St. Andrews, afterwards on the west coast 

 of Ireland, south of England, and off the Spanish coast in the ' Porcupine ' Expedition. 



' Supplement, Annel. Chet. Nap. p. 10, pi. 1. f. 1. ^ Syst. des Annelides, p. 25. 

 ' Arohiv f. Naturges. xxix. p. 37, taf. 4. f. 1, 1863. 



* Aanulat. Polyehst. &c. p. 12. » Supplem. kunil. Chet. p. 14, pi. 1. f. 3. 



VOL. IX. — PART VII. January, 1876. 3 G 



