1904.] MAKIXE FAUXA OF ZANZIBAR. 311 



Puiigutiayii were found inhabiting tubes made of comparatively 

 lai-ge fragments of shell and pebbles attached lengthwise to the 

 underside of a stone. This mode of tube-building is common 

 among e. g. the Terebellidfe*", but forms a contrast to tlie more 

 or less free tubes of most tubicolous Eunicidffi. The appai-ent 

 absence of tubes in the case of di'edged specimens is not surprising 

 in view of its lack in such a worm as Omiphis holohranchiata. 



The ground-colour of the body is greenish, like that of verdigiis, 

 in tint, mottled with light brown. The tentacles, nuchal and 

 doi-sal cirri are annulated, the foi-mer being quite moniliform and 

 the constrictions are emphasised by lines of chocolate-red. The 

 large gills are blood-red. 



These specimens cori-espond in all details with the single example 

 dredged by the 'Challenger' in 18 fathoms off the Cape of Good 

 Hope, except that at first it seemed that the latter had fewei' teeth 

 on its jaw-plates and differed in the distribution of its gills. These 

 differences are, however, accounted for by an examinatioii of the 

 variation of the specimens before us. 



The formula foi- the teeth given by the ' Challenger ' Report, 

 viz. 5 — 6: 5 + 6 — 9, is different to that of the majority of these 

 specimens, which vary a,bout 6 — 7: 6 + 8 — 12, but is very near that 

 of one specimen, 5 — 6: 5 + 8 — 10. The largest number of teeth 

 found on the great dental plates is seven on each. 



In these specimens the gills begin on the third foot, with one 

 exception, where the first branchiferous is the fourth foot. In that 

 of the ' Challenger' they begin on the fifth or sixth. However, a 

 state approximate to this latter is foiuid in three of the six speci- 

 mens, whose fii'st two, three, or four gills are very short simple 

 filaments, mere vestiges of those found on the corresponding feet 

 in the remaining three specimens. The last gill-bearing foot is- 

 usually about the forty-fifth, but may be between the twenty- 

 ninth and fifty-fifth in specimens of approximately the same size. 

 The maximum number of filaments found is twelve, and the gills 

 may or may not meet over the back. 



Prof. Mcintosh's figures of the Cape specimen correspond 

 exactly with the parts they represent in these specimens also. As 

 he notes, the tentacles should be longer, as in E. antennata. AlsO' 

 the trifid ends of the acicular setpe are normally covered by a guard 

 in the usual way. 



A resume of the remaining difterences between this species and 

 the two succeeding may be useful to future workers. 



The form of the body is as in E. antennata, and though some- 

 what flatter anteriorly, is equally highly arched dorsally behind. 

 The prostomium and its appendages form another likeness, but the 

 tentacles ai-e more distinctly moniliform than in the majority of 

 specimens of E. antennata. The sti-ength and size of the dental 

 apparatus, the shape of its plates (especially the lower or mandibular) 

 and the numbers of the teeth they bear, are so closely alike in this 



* It is possible of com'se that tbe worms were inhabiting the tube of a Terebellicl 

 temporarib^ but not likely that two sixcli tubes should have been left vacant and 

 occupied hy the same ?pecies of Eunicid at the same time and place. 



