556 Prof. M'Intosli's Notes from the 



leaves only a trace^ the powerful blunt hook at the tip alone 

 remaining. The large bifid hook of the inferior part of the 

 setigerous region posteriorly conforms to the type seen in 

 the previous species. 



In this form a trace of a branchia sometimes appears on the 

 11th foot, but as a rule branchiee commence on the 12th foot, 

 and are continued backward, as in the former annelid, almost 

 to the tip of the tail. They form single filaments throughout, 

 and only rarely is an accessory process developed. On the 

 whole they are considerably smaller processes than in the 

 former species. 



Whilst occasionally the tube is formed of fragments of 

 shells, it is often entirely composed of coarse gravel and 

 minute stones. This species is probably the Onuphis hyper- 

 borea of Hansen *. 



In the third form, Onuphis (Paradiopatra) fragosa, 

 Ehlers (?) f, var,, which was dredged by the ''Porcupine' 

 in 1869 in 370 fathoms off the coast of Ireland in sticky 

 mud, the median is sliorter than the two long lateral ten- 

 tacles, and the short anterior lateral have finely tapered tips. 

 All have long ringed ceratophores. The palpi form promi- 

 nent rounded lobes ventrally. The first (peristomial) 

 segment has less breadth than the succeeding, and the 

 short tentacular cirri arise laterally at the anterior border. 

 The maxilhe are strongly curved and sharp in front, and 

 their spathulate posterior appendages have a notch between 

 them. The right great dental plate has nine teeth, and the 

 same number occurs in the left, as well as in the azygos 

 plate. The left anterior curved plate has seven or eight, and 

 the right about nine teeth. The mandibles are small, the 

 edge in front consisting of two small central points with a 

 dark brown band between them and the external flap with 

 its oblique edge. 



The first foot is short and directed slightly forward. The 

 setigerous region has dorsally simple tapering bristles with 

 no evident wing. The ventral forms have tips minutely 

 bifid, so minutely that it is not always easy to observe the 

 real structure in such transparent forms. The wings, more- 

 over, are long and tapered to a fine point. 



The feet diminish in prominence from the 1st to the 5th, 

 and still more thereafter. The dorsal cirrus after the 7th 

 is very small. No branchial process has been observed, in 

 this respect agreeing with Nothria abranchiala of the ' Chal- 



* Norweg. N. Atlantic Exp. 1882, p. 32, pi. iv. figs. 5-13. 



t Florida Amieliden, p. 75, Taf. xx. figs. 7-14, and Taf. xxi. figs. 1-4. 



