AUTOLYTUS PPOLIFER. 



223 



bundles of bristles— the superior capillary, the inferior articulated. Unfortunately the 

 bristles are imperfect, only a shaft (Plate LXXTX, fig. 3) having been obtained. The 

 peculiar nature of the dilatation, together with the shape of the foot, would seem to point 

 to its connection with Autolytus rather than either jEusyllis or other form. 



Autolytus ? Female Bud. 



A form captured by the tow-net in the Firth of Clyde differs from the ordinary 

 female Autolytus carrying ova in several particulars, and I am indebted to Professor Graham 

 Kerr, of Glasgow, for bringing it under my notice just as this part is passing through 

 the press. The sole example (Fig. 57) is stained and mounted on a slide, so that only an 

 imperfect description can at present be given. It appears to be fully a quarter of an inch 

 in length, and is readily discriminated by the absence of the single ventral egg-capsule, 

 the ova being borne in eight conspicuous globular or pear-shaped sacs. 



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Fig. 57. — Autolytus (female bud) with, pyriform lateral sacs containing ova. 



The head resembles that of an Autoly ius -bud, with a long median and two somewhat- 

 shorter lateral tentacles, a large rounded dorsal and a larger ovoid ventral eye occur 

 on each side. Each appears to be furnished with a lens. Then follows the buccal 

 segment with two tentacular cirri on each side, the base of the ceratophore being 

 opaque, but apparently without differentiation into a rudimentary ovigerous sac, yet 

 the preparation left uncertainty on this point. The second segment bears a group of 

 typical compound bristles, though the minute bifid terminal pieces are absent, and 

 behind the foot a rounded swelling resembling an egg. A similar condition exists in 

 the third, fourth, and fifth feet, only these have longer dorsal cirri in the preparation. 

 The sixth has the same arrangement on one side, but on the other an egg lies in front 

 of the foot in the ccelom. The seventh has similar bristles, but on one side a large 

 ovisac. The eighth foot has a lanceolate flap and a tuft of long tapering swimming- 

 bristles, and the setigerous region with the compound bristles is larger and truncated 

 distally. Altogether about fourteen segments (i.e., to the twenty-first) bear the long 

 swimming-bristles, whilst the caudal region has about twenty-six segments, the body 



