120 Prof. M'lntosh's Notes from the 



The body is one o£ the largest in the group, measuring 

 about 250mm., broader in front, nearly cylindrical throughout 

 the greater part of its extent, and only tapering a little 

 toward the posterior end. In spirit the peristomium is 

 marked by transverse wrinkles, the most posterior of ■ohich 

 pass to the ventral surface and form a depressed band or 

 groove a slioi't distance behind the mouth. On the ventral 

 surface a deep groove commences behind the transverse line 

 just indicated, and is continued to the posterior end, where 

 it ceases at the terminal cup. This groove is bounded by 

 the rounded and prominent elevations of the ventral longi- 

 tudinal muscles, Avhich are likewise marked off on each side 

 dorsally by a longitudinal groove, which is a continuation of 

 the depression running backward from the median cephalic 

 region. The hrst three segments bear simple bristles which 

 form a short vertical tuft above and slightly in front of the 

 simple spines in these segments. The spines (PI. III. fig. 9) 

 are ])owerful, simple, and nearly straight structures, and 

 usually occur singly, though two may be found in the middle 

 segment, whilst in another example the first and second on 

 one side may be double, the rest single. The tips of the 

 spines ai'e often truncated from abrasion, as in the figure. 

 These three segments are differentiated by the fact that the 

 anterior edge ensheaths that in front, tliough this condition 

 is rudimentary in the first. A glandular area surrounds the 

 bristle-tuft and spine (the representatives of the foot), and 

 they lie in the middle of each segment. The fourth bristled 

 segment is about the same length as the foregoing, and its 

 glandular anterior edge likewise ensheaths the segment in 

 front. It presents a dorsal bristle- tuft in the line of the 

 lateral groove and the spines in front, and a prominent 

 crescentic pad bearing hooks which have long, slightly 

 curvedj and striated shafts gently tapering from the shoulder 

 to the base, whilst the posterior edge or neck above tlie 

 shoulder is concave and the anterior slightly convex, the 

 throat being devoid of hairs. The great fang leaves the 

 neck at more than a right angle, and two curved teeth occur 

 on the crown, Avhich has below it a posterior convexity boldly 

 striated internally. When viewed antero-posteriorly the 

 distal part is narrowed above the shoulder, slightly increases 

 in diameter at the striated region beyond, whilst the crown 

 beyond the main fang is a short blunt cone. The axis is 

 straight in such a view. These bristles and hooks occur a 

 little in front of the middle of the segment, the lower border 

 of the unciuigerous row touching the ventral edge. The 

 fifth bristled segment is somewhat longer than the fourth. 



