Gaily Marine Laloratory, Si. Andrew^. ID 



anteriorly, and the bristles arc directed outward and back- 

 ward. Kacli consists of a flattened brush, with the ed^es 

 dorsal and ventral, of pale golden bristles, the tips of which 

 arc in two scries, a lonp;er and a shorter. Each bristle 

 slightly dilates above its pale bidb to near the origiu of the 

 winj^s, when it tapers to a fine point. Tiie winjjs are of 

 moderate breadth, and cease before reaching the delicately- 

 tapered tip. The bristles of the shorter series have the 

 same structure, but their shafts are more slender. They 

 extend about as far as llie commencement of the wings of 

 the longer series. No noteworthy difl'ercncc between the 

 first and the last tuft occurs. 



The rows of hooks commence at tlie second bristle-tuft, 

 and are long in front, diminishing in length backward to 

 the ninth or tenth, and again increasing at the fourteenth 

 setigerous process — that is, behind the median frill, which 

 succeeds the scutes, — only a brief space separating the long 

 rows in the mid-ventral line, and the same condition is found 

 at the fifteenth. At the sixteenth and seventeenth setigerous 

 processes the rows are shorter, as also is the raid-ventral 

 space between them. The uncinigerous lamellae which 

 succeed are almost ventral in position, being separated only 

 by the narrow ventral surface (Montagu\s dorsum), and tlicy 

 continue to the posterior end (absent in the example). 

 Douijle rows of hooks occur from the seventh to the sixteenth. 



The hooks have a long anterior border, with four or five 

 teeth in diminishing series above the great fang, making 

 five or six in all, and there is no process on the edge of the 

 base beneath the main fang. The posterior outline is boldly 

 convex (opposite the teeth), curving inward to a notch which 

 separates the irregularly convex base. Several strite pass 

 obliquely from the upper teeth to the posterior border. The 

 posterior hooks are somewhat less, and the curves of the 

 posterior outline and base slightly vary. The foregoing 

 hooks (PI. II. fig. 5) dift'cr from those of the Mediterranean 

 species (PI. II. fig. G), which have a process on the edge of 

 the base beneath tlic main fang, and the curvatures also differ. 

 If this form represents Savigny's L. medusa, then the British 

 species should be called />. fjiyantea, Montagu. 



In the ubiquitous Xicolea venuslula, Montagu, the tenth 

 species, the cephalic collar forms a small rim dorsally, and 

 behind it is a row of distinct eye-spots. The antenor border 

 makes a spout-shaped aperture by forming an arch over the 

 mouth, which, seen from the dorsum, narrows a little in 

 front, whilst in lateral view it slopes from above downward 



0* 



