416 ONITPHIS FRAGOSA. 



small, forming at the tenth foot a short subulate process. Besides the spines only short 

 simple bristles, with tapering winged tips, are present. The dorsal bristles are more 

 elongate at the twentieth foot, and beneath are two strong bifid hooks. Tube of greyish 

 sticky mud. Branchias absent. Tube either of pure secretion like a quill or secretion 

 strengthened with gravel and shell-sand. 



Synonyms. 



1887. Diopatra {Paradiopatra) fragosa, Elders. Florida Annel., p. 75, Taf. xx, f. 7—14; Taf. xxi, 



f. 1—4. 

 1903. OnupUs „ „ Mcintosh. Ann. Nat. Hist., ser. 1, vol. xi, p. 556. 



Dredged in 370 fathoms in the ' Porcupine ' Expedition of 1869 in sticky mud off 

 the coast of Ireland. 



Norway (A. M. Norman) ; off the coast of Florida (Ehlers). 



Head (Plate LXIV, fig. 3) comparatively small, with slender tentacles of moderate 

 length, the median being shorter than the adjoining lateral, whilst the shorter anterior 

 lateral have finely tapered tips. No eyes are visible in the preparations. The frontal 

 tentacles are ovoid with narrow pedicles. The palpi form prominent rounded lobes on 

 the ventral surface^ All the tentacles have long ringed cirrophores. 



Body somewhat rounded in front, flattened throughout the rest of its extent. The 

 first segment has less breadth than the succeeding, and carries laterally, at the anterior 

 border, the tentacular cirri, which are subulate and comparatively short. The general 

 colour of the proboscis (Plate LXIV, fig. 3 a) is yellowish, with dark touches here and 

 there. The maxillas are acute and strongly curved anteriorly. A dark band lies 

 between them and the posterior appendages, which are outlined in blackish-brown, and 

 spathulate, a median notch occurring posteriorly. The right great dental plate has nine 

 teeth; the left has nine. The azygos plate on the left has nine. The left anterior 

 curved plate has about eight ; the right nine or ten. The mandibles are small, 

 terminating in front in two rather narrow central tips with a band of dark brown 

 pigment externally between them and the expanded and sloped external blade. 



The first foot (Plate LXXV, fig. 9) is short and is directed slightly forward, the 

 dorsal and ventral cirri and the terminal papilla being of moderate length. It bears 

 ventrally a series of translucent bristles (Plate LXXXIV, fig. 6), the curved tips of which 

 are minutely bifid, with long, pointed wings extending beyond, whilst at the junction of 

 the tip with the shaft is a pseudo- articulation, as in allied forms, though this is not shown 

 by Ehlers. Dorsally are a few simple tapering bristles (often only one) in which no wing 

 is evident. 



The feet diminish in prominence from the first to the fifth, and thereafter they still 

 further decrease so that they* are by no means conspicuous. So far as can be observed 

 no branchial process is present, even the dorsal cirrus, after the first six or seven, 

 becoming very small. 



The tenth foot has a short flatly conical setigerous region, which has, besides the 

 spines, only short bristles with tapering winged tips. The ventral cirrus is now adnate, 

 forming a rounded swelling beneath. The dorsal cirrus is a short subulate process. 



