W. C. M'INTOSH 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 (PI. LXX. fig. 17, which represents one of the larger forms). The bristles 

 throughout are tinged of a light brownish hue. The ventral cii-rus is slender and does 

 not reach the tip of the fleshy part of the foot. There is a series of globular warts or 

 papillae along the ventral margin of the foot, and apparently three ciliated processes 

 beneath the branchiae on the dorsum. 



SiGALioN BUSKii, M'l. In the ' Transactions ' of the Royal Society of Edinburgh I " 

 was inclined to unite this form with the Sthenelais dendrolejiis of Claparede ; 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. mathildw. 



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. pi. 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. matliildce, this form has lanceolate and granular pinnae with narrow tips. 

 They likewise differ from the arborescent papillae of Claparede's S. dendrolepis. 



The superior lobe 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. pi. 15. fig. 5, though in some 

 cases there are eighteen rows of spines, which, as shown in the figure, and as noticed 

 by Claparede, 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 

 papillae 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. Throe ciliated pads 

 occur on the curve below the branchial process. Anteriorly a single papilla, as a rule. 



