166 Prof. M'Intosh's Notes from the 



vascularity (Watson), and the anterior ones almost meet ra 

 the central line ventrally, and reach as far as the bristles 

 dorsally, so that they form the greater part of a ring. 



The tube, which may vary from 3-10 cm. and 2 mm. or more 

 in diameter, as a rule consists of a thick internal lining of 

 secretion which in the middle presents a circular lumen in 

 section, and of two conical, elastic, membranous ends — eacli 

 with a minute aperture. The body of the tube is densely 

 covered with fragments of shell more or less set on edge, and 

 in the preparations generally sloped obliquely toward the 

 anterior end of the tube. The method by which the annelid 

 accomplishes this is graphically described by Arnold Watson. 



3. On Myriochcle heeri fyc. dredged in the Gulf of 

 St. Lawrence, Canada, by Dr. Whiteaves. 



Dredged abundantly in the Gulf of St. Lawrence, Canada, 

 Stations No. 9, 35, 36, 37, and 42, 1873. 



The tube in some is nearly 4 inches in length, the anterior 

 third being spindle-shaped and prolonged posteriorly into a 

 narrow process, thus differing from the tube of Owenia. It 

 is composed of sand-grains incorporated in a very tough 

 secretion externally, and internally of layers of secretion, 

 and to it the animal in the preserved condition clings so 

 firmly that it is difficult to secure more than a fragment. 

 The anterior end forms a conical process with a small 

 aperture at the tip, but only the extreme tip is free from 

 sand-grains. Posteriorly the long narrow tube ends in an 

 aperture, and whilst the greater part of it is covered with 

 the sand-grains in tough secretion, the terminal region, 

 which is almost filiform, is coated with soft sandy mud, which 

 often forms a mass at the tip. The external coating is com- 

 posed of firmly agglutinated mud in which large sand-grains 

 are imbedded, and occasionally a few tufts of Gemeltaria are 

 attached near the anterior end, the larvse having settled and 

 grown thereon. In many the wrinkles and the grains are 

 transversely arranged on the anterior or larger portion of 

 the tube, the long slender posterior end not showing this 

 eondition. In those with shorter tubes the sand-grains, on 

 the other hand, go to the posterior end. 



A few tubes are formed of white sand-grains with black 

 interspersed. 



Tubes from Norway apparently belonging to this species 

 were bristled with sponge-spicules. 



The head and the buccal segment are often somewhat en- 



