32 Prof. M'Intosh's Notes from the 



trends dorsally. The cervical process is suiallcr tlian tlie 

 second, and bears a series of bristles with more sienditr 

 winged tips than the snccecding. A typical tuft in the 

 anterior region presents dorsal bristles with more elongated 

 striated shafts and short, tapering, winged tips. The shaft 

 slightly ta[)ers toward the wings ajid again toward the root. 

 Those at the edge of the series have somewhat broader wings, 

 which are striated and serrated on the edges. A shorter 

 series of bristles occurs at the base, the tips just projecting 

 beyond the skin and having the same gradation as observed 

 in the longer forms. The posterior bristles form a small 

 tuft and are characterized by the great elongation of the tip, 

 especially of the more slender forms, the wings in the pre- 

 paration being scarcely visible. One or two bristles at the 

 ventral edge have the wings considerably widened at the base, 

 but the tips are attenuate. On examining the anterior tufts 

 of bristles with a lens, the sharpest curve formed by the 

 setigerous process is posterior and the concavities are dorsal. 

 They are considerably stronger than the succeeding tufts. 

 The ninth is less powerful and the dorsal bristles are 

 proportionally longer. In transverse section they agree 

 generally with the condition observed in Chone vifundibuli- 

 forinis. 



The first bristle-tuft has no hooks on its ventral border, 

 but the next seven have long ventral rows slightly diminishing 

 in length from before backward, and the hooks occur in a 

 single row. The ninth, which begins the posterior series, is 

 dorsal, and is one-third less in brcadtli than the eighth. 

 Throughout the entire series of rows the hooks maintain 

 the same microscopic characters. The anterior hooks are 

 avicular, have the posterior outline convex and the anterior 

 concave, the great fang leaving the throat at a little less than 

 a right angle, and a series of small teeth occur on the crown 

 above it. The anterior outline, whilst concave at the neck, 

 becomes boldly convex at the prow, which is smoothly 

 rounded anteriorly and inferiorly — ending in a strap-like 

 l)asal process which is usually bent a little downward 

 i)osteriorly. The hooks diminish in size po:iteriorly, and the 

 basal process is shorter. 



In connection with this s|)ecies, it is curious that Sir J. G. 

 T)alyell(lS5o),in watching ihe development and reproduction 

 of Tost parts, made the following remarkable statement: — 

 " Here we seem to reach a postulate, demanding the in- 

 definite — the universal — diffusion of germs ready for develop- 

 ment wherever the obstacles to it cease, or of some creature- 

 power efiectiug a secretion of such matter as may produce 



