48 Prof. M'liitosh's Notes from the 



cirrus. Amongst these are slender, elongate forms which 

 taper to a fine point and do not apjiear to be serrated. It 

 would seem that the habits of this deep-water form differ 

 from those of S. arm'ujer, in wliich the anterior ventral 

 bristles arc much worn. 



The processes of the foot become more distinct and 

 gradually jiass upward (dorsally), and they are joined by the 

 branchia on the 20th foot. About the 30th foot the sediments 

 increase in antero-posterior diameter, and show a deep furrow 

 laterally and dorsally at the segraent-juuction, whilst a 

 prominent flap or ridge on the dorsum slopes l)ackward with 

 tlic various processes, which consist from within outwards 

 of a somewhat short branchia, then of a lanceolate dorsal 

 cirrus with a constriction at the base and the small tuft of 

 long slender bristles, and, lastly, of a larger and a smaller 

 process, the latter probably representing the cirrus — besides 

 a few slender bristles. 



The foot thus differs from the ordinary type {'8. armifjer) 

 in thp less elongate dorsal and ventral cirri. 



Canadian examples are characterized by the small size 

 and filiform condition of the dorsal cirrus, and also by 

 the somewhat reduced size of the ventral processes. In 

 Scolophs anniger procured by the 'A^alorous' in the same 

 expedition the processes are also more elongate. 



A species of Theodisea, viz. T. mammillata, Cla))arcde, 

 has been described by Cunningham and Ramagc * from 

 Granton Quarry in the Forth. The details given of this 

 species do not render its exact structure quite clear, and it 

 certainly differs from the Mediterranean fragment procured 

 l)y the ' Porcupine.' 



Naulonereis quadricuspida, Fabr., was procured in con- 

 siderable abundance between tide-marks at Lochmaddy, 

 North Uist, in 1865. The head forms a round button- 

 shaped process, the peristomial segment being notched at 

 each side. The body is about 3 inches in length, slightly 

 tapered in front, and considerably diminishing towards 

 the tail, which ends in tw'o rounded dorsal papillae and two 

 short ventral cirri. The anterior region has thirteen bristled 

 segments. The branchiae commence on the 6th foot, are of 

 comparatively large size, and continue to the 8th or 1 0th 

 se"'ment from the tip of the tail. At the 10th foot the 

 branchia is flattened and acutely lanceolate, and it is sepa- 

 rated by a space from the dorsal division of the foot, wliich 

 bears a'fan-like tuft of tapering bristles with smooth shafts 



* Trans. R. S. E. vol. xxxiii, p. 0!2. pi. xxxviii. fitr. 8. X- pi. xl. fi<j-. 8. 



