Galhj y[anne Laloratori/, St. Andrews. 109 



lateral flaps of tlie rim, which extend backward to the notch. 

 Behind tlic notch the rim in some is consi(lcral)ly less 

 developed, forminj;; a slij^htly raised smooth marjjin which 

 in lateral view is at a lower level. The keel varies a little 

 in different examples, but it is generally narrow and arises 

 almost at the posterior rim, bending (For it is curved in the 

 middle) forward to the central median process, which is 

 sliji;htly under the keel, and in one a little papilla occurred 

 at the base of the process. Tlic nuchal grooves commence 

 posteriorly almost in a line with the lateral notches, slightly 

 approach each other in their passage forward to terminate in 

 the furrows at the side of the central process. No eyes 

 were observed in the preparations. The mouth opens as a 

 transverse slit on the ventral surface a short distance behind 

 the median frontal process, the prominent posterior lij) being 

 marked by a regular series of longitudinal strife. 



The body, which extends to 1013-110 mm. and is 3-5 mm. 

 in diameter, is distinguished by the enlarged cephalic end, 

 the constricted anterior region, and the conspicuous and 

 somewhat urn-shaped segments posteriorly, terminating in 

 the characteristic funnel, with its somewhat alternate 

 arrangement of long and short cirri. The ventral streak 

 is in the form of a ridge which extends from a little behind 

 the mouth to the })osterior end. The combined pro- aiul 

 peristomial region is often reticulated after the niMnner of 

 crocodile skin, and this condition occasionalh^ occurs dorsally 

 on the anterior border of the first bristled segment, which 

 bears on each side a vertically elongated tuft of bristles, and 

 after an interval ventrally a short row of hooks. The 

 bristles agree with those of the following segments — having 

 long stout shafts, tapered tips, which have distinct wings, and 

 end in slender extremities with minute spikes at the sides. 

 These are readily seen at the end of the wings, but in the 

 filamentous continuations are less easily noticed. 



The spines of the first segment are large and strong, with 

 nearly straight striated shafts, which slightly increase to the 

 shoulder, the neck being short and a little constricted in the 

 middle, dilating distally in lateral view, and each has a great 

 fang with a sinuous distal edge, the angle with the neck 

 being greater than a right angle. Four hooks occur in 

 lateral view behind the great fang. The neck is longi- 

 tudinally striated at its distal end, and has a projection (in 

 front) below the great fang, but though short strise exist on 

 each side of the base of the fang no gular bristles are present. 

 The same description applies to the hooks of the second 

 and third bristled segments, the rows of which are also 



