226 ANNALS OF SCOTTISH NATURAL HISTORY 



The second, third, and fourth pairs are somewhat similar to 

 those of that species (Fig. 8). In the fifth pair the inner 

 portion of the basal joints is only slightly produced ; the 

 posterior free margin, which is irregularly angular, bears four 

 setae the two exterior setae are close together, but the other 

 two, which are moderately stout, are somewhat distant from 

 each other as well as from the two exterior setae ; the second- 

 ary branches are subquadrangular, they are longer than broad, 

 and are each furnished with five setae ranged around the 

 distal end the middle seta is much shorter than the others 

 (Fig. 9). Caudal stylets short, about equal in length to the 

 last abdominal segment, and each furnished at the apex with 

 a long slender seta interiorly and two small setae at the outer 

 angle, while intermediate between these is a broad spine-like 

 appendage. This appendage, seen from the dorsal aspect, has 

 its two margins apparently nearly parallel for rather more 

 than half its length ; they then taper towards the end, where 

 the appendage terminates in a slender hair. This tapering 

 portion is plumose on both sides, but the feathering shows 

 most prominent on the inner edge. The middle portion of 

 each long seta also appears to be plumose (Fig. I o). Ovisacs 

 two, moderately large. 



Habitat. Ayr Bay, Firth of Clyde, not very rare. 



Remarks. Perhaps the most obvious character of this 

 small but distinct and interesting species, and one which 

 requires no dissection to render evident, is that of the 

 curious broad spine-like appendages of the caudal stylets. 

 The peculiar character of these appendages distinguish this 

 species at a glance from any other member of the genus. 

 The species is named in compliment to Herr Dr. W. 

 Giesbrecht, of the Naples Zoological Station. 



DELAVALIA ^EMULA, T. Scott. 



This species was described in the " Eleventh Annual 

 Report of the Fishery Board for Scotland " (part iii. p. 204, 

 Plate IV., Figs. 36-47, 1893), from specimens obtained in 

 Largo Bay, Firth of Forth, and till this year this was the 

 only station for the species known to us ; we are now, 

 however, able to record its occurrence in the Clyde estuary, 



