Lj/cbris margarildcea. 

 42 



231 



o, L. margariUicea, natural size; 6, the head, magnified ; c, a view of the proboscis from below ;< 

 dy the feet, with the filaments and bristles. ; 



which are articulated two longish papillae : and beneath these,' 

 and exterior to them, there are two much larger papillary! 

 processes, terminated with a small knob-like point, which is 

 entirely retractile within the lower portion. On each side of 

 the head, originating from a common swollen base, there are 

 four setaceous tentacula of unequal lengths. The moiith is 

 somewhat inferior, wide and terminal, furnished with, a short 

 thick proboscis, divided into two portions by a circular fold, 

 and capable of being extruded at pleasure : its point is armed 

 with two curved serrated horny mandibles ; and around these 

 there are placed, on as many swellings, six distinct patches of 

 small black horny prickles, the side patches larger than the 

 others ; two still smaller patches, on mammillary swellings, are 

 situated just under the projecting lobe of the head ; while, at 

 the very base of the proboscis, we find a band of similar 

 prickles, some larger than others, arranged in several irre- 

 gular series. The whole surface of the proboscis is marked 

 with pale longitudinal lines (muscles?), frequently anasto- 

 mosing. The segment immediately behind the head is footless, 

 and scored with faint whitish lines, or sometimes spotted ; and 

 oblique lines of the same kind may be seen, with a magnifier, 

 on the sides of the other segments. These are very numerous, 

 shorter than their breadth, smooth, and furnished with papil- 

 lary feet, filaments, and setae. The feet of the first two 

 segments consist of only two fleshy papillse, but all the rest 

 have three arranged transversely : the papillae are short, 

 obtuse, and equal ; and, at the base of the superior one, as 

 well as under the inferior one, there is a tentacular non- 

 retractile filament; while a small brush of setae issues from the 

 inner side, and near the root of each. These brushes are 

 made up of a single strong black bristle and a considerable 

 number of slender straight hairs, and can be pushed out or 

 withdrawn at will. The tail is terminated with two short 

 filaments. 



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