Gatly Marine L'.i/)orat'ji\f/, S(. Andrews. 40 



tints tlie prominent parts of the lips, wliicli form a curved 

 frilled band on each side of the mouth. The biauchiae are 

 four on each side, attached to the dorsum of the third seg- 

 ment, and two somewhat in front of the otiier two. 'J'hey 

 are proportionally small tapering organs and quite smootli. 

 It has laterally a process of the peristomial segment, which 

 also boMuds it behind. Ventrally is the mouth, which has a 

 fleshy lip on each side, whilst anteriorly the dorsal surface 

 of these bears the tentacles, which vary much in length 

 in ditl'erent examples, apparently from their condition 

 as regards reproduction. The base is the thickest part of 

 each, and it is smooth at first, then the organ tapers to 

 the free end, which is in the preparations somewhat clavate 

 and more finely granular than the rest. The processes or 

 "cilia" gradually increase in length, forming conspicuous 

 organs till within a short distance of the ti[), which is free 

 from them. Each is a translucent process of hypoderm 

 with a central axis or rod, the outline presenting a slight 

 enlargement at the base and again at the tip, especially in 

 those toward the distal end of the series. The translucent 

 hypoderm of these processes is grannhir and slightly streaked 

 at the enlarged terminal part, which also occasionally shoM's 

 ] alpocils in the preparations, but whether due to the action 

 of the preservative fluid or otherwise is unkjiown. The 

 axial fibre is structureless and is brittle. 



The function of these peculiarly armed tentacles appears to 

 be of a special character, as the central axis in each " cilium " 

 shows, riie body is elongated, very little narrowed in front, 

 but considerably tapered postoiorly, where it ends in a tail, 

 having two cirri of moderate length placed ventrally on each 

 side of an anus, which in some presents a slightly crenate 

 margin. The dorsum is smoothly rounded throughout, and 

 the ventral surface is also convex anteriorly, whilst the 

 boldly marked glandular thickening of the segments gives 

 a character to the region, which is nearly co-extensive with 

 the bristled segments, and thereafter a median groove passes 

 backward to the tail. The thickened ventral surfaces of the 

 anterior segments show a slight differentiation of the median 

 line, which, in contraction, is curved backward and by-and- 

 by is somewhat elevated, and thus is in contrast with the 

 fully extended example. 



The antci'ior region has fourteen pairs of setigerous pro- 

 cesses, the first of which is dorsal in position, being situated 

 just external to the branchiae of its side, and the next three 

 gradually slope to the side along which the rest lie., ilach 

 tuft consists of a series of longer translucent bristles, having 



Ann. (k }fag. X. Hist. Ser. y. Vol. xv. 4 



