W. C. MSINTOSH ON BRITISH ANNELIDA. 391 
rows of spines at the tip of the shaft, visible, however, only at the edge. The terminal 
portion consists of two divisions—a long basal, and a terminal portion only about one 
fifth the length of the basal. The claw at the tip is distinct and much curved; and 
the secondary process beneath is apparently separate, just touching the former at the 
tip. The next, inferior group of bristles are less robust, but have only two divisions in 
the terminal portion. The more slender ventral series, again, have three divisions in the 
distal region (Pl. LXX. fig. 17, which represents one of the larger forms). The bristles 
throughout are tinged of a light brownish hue. The ventral cirrus is slender and does 
not reach the tip of the fleshy part of the foot. There is a series of globular warts or 
papille along the ventral margin of the foot, and apparently three ciliated processes 
beneath the branchiz on the dorsum. 
Sigaion Buskul, M‘I. In the ‘Transactions’ of the Royal Society of Edinburgh I° 
was inclined to unite this form with the Sthenelais dendrolepis of Claparéde; but a 
more careful consideration of all the facts has caused me to revert to the name originally 
given. ‘The species is of some size, and stouter than S. mathilde. 
The head is pale, no eye-specks being visible in the preparation. The scales ante- 
teriorly are somewhat quadrate, with the inner edge rounded. Remarkable pinnate 
processes (Trans. R. S. E. vol. xxv. pl. 12. f. 12) occur on the outer edge (Pl. LXX. 
fig. 14), and are quite visible under a lens. Instead of the hyaline cylindrical pro- 
cesses of S. mathilde, this form has lanceolate and granular pinne with narrow tips. 
They likewise differ from the arborescent papilla of Claparéde’s S. dendrolepis. 
The superior Jobe of the foot (which is somewhat spathulate in lateral views) has 
very long and, superiorly, boldly serrated bristles, the inferior (in ordinary views) being 
much shorter and more delicate. ‘The former show a bare portion of the shaft at the 
base. The superior series of the ventral lobe are simple serrated bristles with a fine tip. 
Those next resemble that figured in the Trans. R. S. E. pl. 15. fig. 5, though in some 
cases there are eighteen rows of spines, which, as shown in the figure, and as noticed 
by Claparéde, are arranged in a spiral or whorled manner, some much resembling the 
stalk of Equisetum. The jointed tips of these have from five to ten divisions, and finely 
tapered and minutely bifid extremities. Below these are a few represented by fig. 4 in the 
same plate, the terminal process consisting of about eleven segments, and being rather 
distinctly bifid at the tip. Others have more delicate shafts with a few serrations at the 
end, and a shorter terminal portion of six or seven segments. One or two below the 
papille for the spine have stout shafts only faintly crenated at the distal end, and a 
terminal process of one or two segments with a characteristic claw. The inferior 
bristles have slender shafts with two or three serrations at the end, and terminal 
processes of eight or nine divisions ending in rather deeply bifid tips. ‘The inferior 
cirrus is slender and long, reaching beyond the tip of the foot. Three ciliated pads 
occur on the curve below the branchial process. Anteriorly a single papilla, as a rule, 
