110 Prof. M'lntosh's Notes from the 



comparatively short. The hooks of the fourth segment have 

 shafts whicli are more distinctly curved and tapeied at the 

 base, have lojiger necks, which are broader distally, and 

 more distinct shoulders. The great fang comes off almost 

 at a right angle, the distal outline is nearly a continuous 

 curve, and three teeth are on the crown behind it. More- 

 over, a few have short gular bristles, and no distinct 

 enlargement occurs on the throat at the base of the main 

 fang. The typical hook, for instance, at the eighth segment 

 has a long curved shaft, which is tapered from the shoulder 

 to the base, and dilates from the shoulder to the crown. 

 The main fang has a smooth curve distally and comes off at 

 a right angle to the neck. After a brief interval a tuft of 

 gular bristles springs from the front edge, curves to and 

 rises above the tip of the fang. The neck is striated 

 obliquely, and the shaft longitudinally. The posterior hooks 

 are somewhat smaller, but they retain the chief features 

 above mentioned, the four teeth on the crown behind the 

 great fang being especially distinct. 



From the first to the eighth the bristles and hooks are 

 situated laterally and ventrally toward the anterior part of 

 the segment, but in the ninth it is toward the posterior border 

 of the segment, and the glandular elevation for the hooks is 

 more pronounced. The posterior bristled segments, as 

 mentioned, are somewhat urn-shaped, the narrow end being 

 in front and the broader, with the elevated ridges for the 

 hooks, being posterior. In the posterior segments the 

 hooks slope to the dorsum, and their great fangs point 

 forward. The segments from the ninth to the sixteenth are 

 comparatively long, but the last two are shorter. I'our 

 diminishing unarmed segments follow, each with a lateral 

 glandular elevation, the homologue of the ridge for the 

 hooks. The anal funnel springs from the last and its edge 

 is fringed with a series of long and short cirri, a long one 

 occui'ring in the mid-ventral line, and long and short 

 alternating, but with occasional irregularity. Their number 

 varies from twenty to thirty-eight (Canada), small examples 

 having fewer, as a rule, than the large ; Arwidsson gives 

 the number as twenty and thirty-four, and the long cirri as 

 from nine to twenty-eight in the northern examples. In a 

 large specimen from Gaspe Bay, Canada, there were forty 

 cirri, some, however, being mere points. The cirri generally 

 vary considerably in breadth at the base and in length, those 

 having broad bases being fewer in number. In the centre of 

 the funnel is the anal cone, which in contraction forms a 



