24 Prof. M'lntosh's Xufc-ii from Hip 



papilla. The bristles of the fiatteiud eaudal iep;ion, agjain, 

 while retaining the form of a pencil, have the tips of the 

 majority gjreatly elongated, so that this region of the body 

 is specially liirsutc. No wings are visible in these much 

 elongated forms, but in the shorter forms these are well 

 marked and have serrated edges. The anterior hooks, 

 which commence on the second bristled segment, are situ- 

 ated on long low flaps, eight in number, which stretch from 

 the setigerous process almost to the ventral scute iu each 

 segment. They are in a single row, and are characterized 

 bv their somewhat long necks, from Mhich the main fang 

 arises at less than a right angle, and has eight or nine small 

 teeth above it. The prow is rounded and prominent, but 

 the base is short, for it abruptly tapers to a blunt point 

 posteriorly. A series of bold strife occupy the central 

 region from the crown to the base, into which they curve. 

 De St. Joseph found no less than one hundred and eight to 

 one hundred and forty hooks in a single row in the anterior 

 region. Each hook is accompanied by a short bristle with a 

 thick shaft, a slight narrowing of the neck, then an enlarge- 

 ment of the base of the flattened tapered tip, which is bent 

 backward at an angle, and according to position is either 

 symmetrical or asyjumetrical. The posterior hooks do not 

 differ except in the length of neck and smaller size, and in 

 the presence of short striae on the neck at the base of the 

 great fang. These may indicate a stage in the development 

 of hook-like points on the region. l)e St. Joseph states that 

 these have smaller and shorter bases, and he gives the 

 nunil)cr8 in several examples. 



About two-thirds of the large tube is composed of a fairly 

 firm, yet elastic secretion with little mud, and occasionally 

 a shell is attached. The basal region, which appears to be 

 fixed, is coated with greyish mud. 



A young example occurred in the fissure of the rock a 

 few inches from the adult. When alive, it appeared to he 

 about half an inch in length. The anterior region has seven 

 setigerous and six uncinigei'ous processes^ whilst the pos- 

 terior consisted of about thirty-nine segments, the tip of 

 tiie tail apparently being incomplete. Nine scutes are in 

 front of th(;se split hy the mid-ventral line, instead of eleven 

 in the adult, showing that, whilst the two behind the an- 

 terior region are constant, the rest increase with age. The 

 ce[)halie lamellae and folds are similar. The branchial fila- 

 ments are respectively eleven and twelve, and they have the 

 beautiful white tints of the adult, and the same basal web. 

 The " ocular " pigment-spots in the preparation, however. 



