Gatty Marine Lahoratory, St. Andrews. 85 



After the cirrus the edge slopes backward to form the 

 pillars at the sides of the mouth. 



The veil is more restricted thau in any of the allied forms, 

 and its outline is fan-sha[)ed, the anterior edge having ten 

 or eleven rather lai^e tapered papillse or limbriae, the etlges 

 a few others as they pass to the anterior region of the mouth. 



The tentacles arise on each side immediately behind the 

 veil, and form a considerable lateral group on each side. 

 They have the usual shape, and the extremities in the pre- 

 parations, as in life, are often clavate. Numerous smaller 

 forms occur posteriorly, and all are attached to a surface 

 continuous with and forming part of the veil, and thus are 

 in front of the mouth dorsally. The small lateral fold of the 

 veil to a certain extent forms a guard antero-laterally. A 

 broad fillet occurs on each side of the mouth posteriorly, and 

 a median fold completes it behind. 



Tlie second cirrus arises laterally a little behind the margin 

 of the crown, and is a long subulate tapering organ. A 

 ridge passes ventrally from it on each side, meeting its fellow 

 in the middle line behind the mouth, and may be taken to 

 represent a segment. The next two are branchial segments, 

 each having the typical branchia of the group, viz. a series 

 of flat lamellae largest internally and diminishing externally, 

 attached to the basal and posterior stem. The second is 

 smaller, but of similar structure. These two segments are 

 glandular ventrally, and in the centre of each is a median 

 fold or boss. 



The next region of the body, which is smoothly rounded 

 dorsally, flattened and grooved ventrally, consists of three 

 bristled segments devoid of hooks. The first two are highly 

 glandular ventrally from side to side, and with the median 

 fold, whilst the third is apparently only partly so, being con- 

 tinued ventrally as a transversely folded baud with a slight 

 median differentiation. The bristles in these are typical, 

 viz., strong bristles with tapering tips, which show traces 

 of wings, and those with the spear-head dilatation and the 

 long hair-like tips, the ed^e being serrateil. 



The succee ling region of the body still remains smoothly 

 rounded dorsally, but ventrally it has throughout the five 

 or six anterior segments a fusiform area in the centre — 

 apparently a special glandular region. At each side ventrally 

 in a line with the lamellae is a short glandular patch, which 

 diminishes as the segments go backward. The ventral sur- 

 face generally is flattened and grooved posteriorly. This 

 region has fourteen pairs of dorsal bristle-bundles attached 

 to the dorsal edges of the lamcllte bearing the rows of hooks. 



