42 Tiof. M/Intosh's Notes from the 



and translucent posteriori^', whilst the muscular fibres 

 increase in bulk and power. A complex reticulation o£ 

 blood-vessels covers the wall o£ the canal anteriorly. 

 Strong fibres from the bod3'-wall cross the canal, but are 

 not attached to it. The intestine is coated throughout Avith 

 the brownish digestive gland, whicli is deeply tinged with 

 yellow pigment. It ceases within a quarter of an inch of 

 the vent. 



Clwne cluneri, Malmgren, the fifteenth, a widely-distri- 

 buted species, extends ficm British waters to Spitzbergen 

 and the Gulf of St. Lawrence, Canada. The cephalic collar 

 forms a considerable web dorso-laterally, passing backward 

 to the line of the second bristle-tuft, and doubling forward 

 along the edge of the dorsal fissure on each side so as to 

 make conspicuous parallel edges to the fissure, as far as the 

 base of the pedicle for the branchiae. The pedicle, after 

 removal of the branchiae, does not project beyond the rim 

 of the collar. The branchiae are distinguished by their 

 comparative length and the long slender terminal processes. 

 The structure of the filaments is typical, and they slightly 

 taper distally, ending in a remarkably long winged process, 

 which tajjcrs to a delicate tip and has a slender continua- 

 tion of the chordoid axis in the centre. The number of 

 filaments ranges from six to twenty-two on each side 

 according to size, the latter being the number in a fine 

 exanij)le from Jan Meyen, kindly sent by Prof. Fauvel, and 

 they are united by membrane throughout the greater part 

 ot their length, the tip being iree. The pinnae aie of con- 

 siderable length, each having the jointed choidoid axis. 

 They continue long till near the basal web of the terminal 

 process, when a few shorter occur. 



The body in all the examples observed is considerably 

 smaller than that of C. fauveli, and is nearly of the same 

 diameter throughout the anterior three-fourths, though a 

 little tapered in front. It then diminishes gently to the 

 tail, which is by no means acute. It is somewhat flattened 

 and grooved anteriorly on the dorsum, and grooved ventrally 

 from the ninth scute backward. A papilla marks the anus 

 at the tip. The number of segments would appear to be 

 about fifty, and they are distinctly marked, with the excep- 

 tion of the minute caudal rings. The anterior bristles are 

 in two groups' — an upper, with longer shafts and tapering 

 winged tips, and a lower, of spatulate form, with a short 

 tapering process at the tip. The tufts are fewer and smaller 

 than in C. fauvel'i. Posteriorly in front of the tail the tips 



