,>10 Prof. M'Intosh's Notes from the 



The bristles of tlie two series agree in structure, though it 

 must be stated that the long example from the ' Knight 

 Errant ' has dorsal and ventral bristles of a more slender 

 character than the northern, and they are paler, and further 

 that the papilla are longer and more slender both dorsal ly 

 and ventrally. In this specimen also from the ' Knight 

 Errant' a parasitic Infusorial form allied to Carchesium 

 projects from the anterior pit. 



6. On the foregoing Families dredged in the Gulf of 

 St. Lawrence, Canada, by Dr. Whiteaves. 



An example of the Sphaerodoridae, viz. an Ephesia, offers 

 certain differences from the ordinary British and northern 

 form (not the southern), in so far as it presents a distinctly 

 articulated tip to its bristles, which, besides, have an enlarged 

 end of the shaft with an oblique continuation, as in the 

 Syllidae, the terminal piece, which tapers to a sharp point, 

 being frequently lost. It thus presents a close resemblance 

 to Ephesia antarctica *, Mel., from the Antarctic Circle, as 

 first procured by the 'Challenger,' and more recently, described 

 by Prof. Ehlerst, by the German exploring-ship ' Valdivia,' 

 though the bristle shows no spikes on the bevelled margin of 

 the end of the shaft — a condition, however, which is very 

 easily altered by friction. 



The Chlorsemidae are well represented by good examples 

 of Stylarioides plumosa, 0. F. M., one of which had a para- 

 sitic crustacean attached to a branchia, the elongated body 

 like an ovisac projecting nearly as far as the tips of the 

 branchiae. A variety dredged in considerable numbers in 

 125 fathoms off Cape Rosier Lighthouse has a comparatively 

 smooth surface, for the papillae are very minute and few or 

 no foreign particles are adherent. This form has normal 

 bristles and hooks, whereas another variety with the roughly 

 papillose dorsal and ventral surfaces has longer and more 

 slender ventral crotchets, whilst the dorsal bristles are also 

 somewhat longer, and in this respect it agrees with a similar 

 variety procured by H.M.S. ' Valorous/ Whether the soft 

 reddish mud of the region favours this tendency to a smoother 

 surface of the first-mentioned is unknown, but the condition 

 is noteworthy. In one instance the body is quite pale 

 throughout and has no trace of the fine reddish mud. Brada 



* Annel. ' Challenger,' p. 361, pi. xliv. fig. 5, and pi. xxii. a. figs. 22 

 &23. 



t ' Die bodenassigen Anneliden, &c.' p. 107, tab. xiv. fig9. 7-13 (1908). 



