BRITISH NEMERTEANS, AND SOME NEW BRITISH ANNELIDS. 409 



in the stomachs of cod captured off St Andrews Bay, and a few specimens also 

 occur at low water under stones. In the scale of the living animal a series of 

 radiating lines are observed to stretch outwards from the point of attachment. 

 The dorsal tuft of bristles is not conspicuous, and consists of a series of delicate 

 translucent bristles, with faint serrations at the tip. The bristles of the ventral 

 bundle are characteristic (Plate XV. fig. 6, 6 a, 6 b), being pale, elongated, and 

 flattened out at the tip in varying degrees. The claw at the extremity of the 

 broad examples is short and strong, while the inferior division is slender. The 

 oblique transverse lines from the rows of spines are also very distinctly marked. 

 Sthenelais dendrolepis, Clap.* was dredged in 90 fathoms, off North Unst, 

 Shetland, by Mr Jeffreys. — It has rather the aspect of S. boa, Johnston, than 

 Sigalion mathildce, Aud. and Ed., but it can at once be observed that its bristles 

 are more elongated than in either of these species. The form of the anterior 

 scales also approaches that in S. boa, being somewhat quadrate, with one end 

 rounded ; but instead of having the simple papillae which characterise the margin 

 of the scales in the latter, the new species has peculiar pinnate processes (Plate 

 XII. fig. 12) ; the whole having a tree-like figure, while the shape of the pinnae 

 and the contour of the process in general readily distinguish it again from the 

 pinnate appendages on the scales of S. mathildce. The process in the latter has 

 a less robust form, its pinnae are hyaline cylindrical processes ; whereas in the 

 present species they are lanceolate and granular lamellae, with a narrowed 

 papillary tip. The specific differences are likewise very apparent in the form of 

 the feet and their appendages, the superior lobe being somewhat leaf-shaped or 

 ovate, with a simple terminal process superiorly, and shorter than mS. mathildce; 

 the inferior lobe again has the spine-papilla much more prominent than in the 

 last-mentioned species. While the bristles of S. mathildce are proportionally 

 more slender than inS. boa, here they exceed both in length, especially as regards 

 the terminal process. There is a general resemblance in all the three species as 

 regards the superior fascicle, but the inferior groups differ very characteristically. 

 In the new species the superior bristles of the series with the jointed tips (which 

 adjoin the short tapering-spiked forms) have the terminal portion of the shaft 

 covered with whorls of somewhat sparse spikes (Plate XV. fig. 5), which (spikes) 

 are much more numerous than in either of the others before mentioned ; while 

 the stouter series next these (Plate XV. fig. 4) have the same portion of the shaft 

 closely and transversely rowed with minute spikes. The spikes on the terminal 

 portion of the shaft of the inferior bristles are likewise more distinct, and the 

 terminal clawed portion longer. 



* Les Annelides Chetopodes du Golfe de Naples, p. 99, pi. iv. fig. 4, and pi. v. fig. 1. I had 

 described this new species under the name of S. bushii, but the unavoidable delay in the publication 

 of the present paper gives M. Claparede's title the priority, if, as I am inclined to think, it refers 

 to the same species. 



VOL. XXV. PART II. 5 M . 



