278 NOTOMASTITS LATERIOEITS. 



base on each side are two groups of brownish grains (eyes ?) marking the nuchal organs. 

 The second or buccal segment is biannulate, devoid of bristles, and the mouth opens on its 

 ventral surface as a proportionally large aperture. 



The body is from 6 to 10 in. in length, a little tapered in front of the large anterior 

 region, remaining of nearly equal diameter for a considerable distance, and then tapering 

 gradually to the tail, which ends in a slightly upturned vent with two papillse beneath. It 

 is more or less rounded throughout, dorsally, slightly flattened ventrally, and behind the 

 rounded anterior region the latter surface is marked by a central band with aline at each 

 side, though posteriorly it becomes less distinct, being merged in the ventral groove of that 

 region. 



The anterior region consists of the buccal and eleven bristled segments, each of which 

 is two-ringed, and more or less tessellated on the surface. The succeeding region differs in 

 appearance, having, as a rule, longer segments, with prominent tori for the hooks. Anteriorly 

 each segment shows a double median dorsal elevation, and two long lateral ridges which pass 

 to the ventral surface. Posteriorly again, the four tori are more nearly equal in size, and 

 more widely separated, two being dorsal and two ventrolateral in position, the two 

 median elevations of the dorsum having disappeared, and toward the tip of the tail the 

 four prominent tori give the body a quadrangular aspect on section. 



Colour of the anterior region deep reddish, then reddish-brown and pale greyish 

 posteriorly. Sometimes blotched with pale lateral areas (reproductive elements?) and 

 with large white bodies (cells) in the perivisceral cavity. 



The anterior segments have a deep transverse furrow, which divides them into two 

 halves. Laterally this furrow bends backward at each bristle-tuft, making, as it were, a 

 small setigerous lobe or process, the bristles issuing quite at its posterior border. The 

 two dorsal tufts are wholly dorsal and thus much nearer each other than the ventral. 

 The bristles (Plate CVII, fig. 9) have simple straight shafts, which begin to taper at the 

 slight bend marking the commencement of the somewhat narrow wing. Though the tip 

 is acute, yet the whole bristle is elastic and strong. De St. Joseph states that their bases 

 rest on a large gland. 



At the twelfth bristled segment a double process carrying hooks appears in the mid- 

 dorsal line, and this continues to the twentieth of the region without much change. 

 Thereafter the two processes have a tendency to disappear, so that at the thirtieth no 

 trace occurs, the arrangement resolving itself posteriorly into a dorsal and a ventral pair 

 of tori, the former rounded and short, the latter more elongated. As a consequence a 

 somewhat quadrangular aspect is given to this region of the body. 



The medium dorsal tori and the dorsal and ventral tori, from the commencement of the 

 second region of the body to the posterior end, are furnished with minute, elongated winged 

 hooks of the same structure (Plate CVII, figs. 9 a and 9 b), viz. a long, slender shaft, slightly 

 narrowed at its commencement, and again toward the neck, the tip ending in a small 

 sharp, main fang, whilst the crown has two spikes above it. De St. Joseph states that there 

 are from thirty-six to forty crotchets in the median dorsal series — some pointing to the 

 right, others to the left, by which he means the double nature of the tori as already 

 mentioned. Moreover, he describes and figures the spike next the great fang as having 

 four points in a transverse row. There is certainly complexity. 



