Gatty Marine hahoraiorij ^ St. Andrews. 



255 



tliere are two much more slender bristles with long, tapering, 

 diaphanous, terminal pieces, apparently larval ventral bristles. 

 The dorsal have the adult structure, being slender, tapering, 

 hair-like, serrated bristles. The dorsal cirrus is much en- 

 larged at the base, but with a slightly tapered tip. Viewed 

 from below the ventral cirrus shows a similar dilatation 

 (ceratophore) at the base and a two-jointed cirrus, a globular 

 papilla occurring some distance inwards. 



Tiie body, which is marked by transverse lines, termiriates 

 posteriorly at this stage in a broad pygidium. The three 

 pairs of scales of a globular outline are borne on pedicles, the 

 outer edge of each having several large truncate papillse 

 which greatly exceed the proportions in the adult. 



In the next stages, found on the same date, the snout is 

 truncated and the caudal process has a dimple in the middle. 

 Then the head becomes defined as an oblong mass, rounded 

 in front, and flanked on each side by the tentacular cirri, which 

 are now directed forward. There are still only four bristled 

 feet. The cilia on the scales are larger, and two short broad 

 caudal cirri have appeared under the pygidium. 



Fijr. 1. 



Anterior end of young Pholoe, X 100. 4tli February, 1899. 



The bottom tow-net again procured, on the 4th February, 

 in 5 fathoms, a young Pholoe having thirteen bristled feet on 

 each side. The head bears in front two closely approximated 

 median eyes (fig. I) and two are more widely situated towards 



