K. J. Bush — Two genera of tubicolous Annelids. 135 



cini irregularly trapisiform with a number of sharp appressed 

 teeth, the last one long, blunt and notched (bifid) on the end, 

 those on the abdomen smaller and thicker, the notch on the 

 end tooth not always discernible. 



Tube conspicuously ornamented or sculptured when mature 

 and perfectly developed, often marred by erosion, more or less 

 spreading along the sides and attached the entire length (rarely 

 lifted), the high median keel often prolonged as a spine-like 

 projection at the aperture. 



PsEUDOVERMILIA OCCIDENTALIS (Mcintosh) Bush. 



Spirobranchus occidentalis Mcintosh, Challenger Eeport, XII, p. 429, pi. 

 lv, fig. 10, pi. xxix a, figs. 31-2, 1885. 



Pseudovermilia occidentalis Bush, this Journal, p. 54, 1907. 



This species, recorded by Mcintosh from off Bermuda in 

 435 fathoms attached to an echinoderm, is also found along 

 the shores of Bermuda on the underside of the hat-coral 

 (Agaricea fragilis) and other hosts. 



It forms highly ornamented tapered tubes, usually isolated, 

 variously curved and twisted, usually attached their entire 

 length, thickened when mature and spreading along the sides 

 with a high, conspicuous, dorsal keel often forming a spine- 

 like projection at the aperture ; conspicuously elevated trans- 

 verse lines radiate from this ridge, arranged at first in herring- 

 bone fashion beyond which they become irregularly curved ; a 

 small rounded thread rendered nodulose by the tran verse 

 ornamentations, separates the two series and a similar but less 

 developed one sometimes appears just below the dorsal keel. 

 This characteristic sculpture is often obliterated by erosion 

 and the young seldom show any trace of the transverse lines, 

 so that as a determining specific factor the tubes are of little 

 use. 



Animal is slender, rounded, the forty (40) or more segments 

 defined only by series of uncini on the abdomen widely sepa- 

 rated along the median portion, becoming crowded posteriorly. 



Branchiae long with very long slender crowded pinnae 

 abruptly decreasing in length, forming a broad truncated tip, 

 6 in each lobe. Operculum with a somewhat thickened 

 slightly concave disc-like dark brownish horn-colored (appear- 

 ing as black) chitinous end, having a long, sharp, thorn-like 

 spine near one side, often irregularly bent. One operculum 

 shows the end in the act of slipping off, revealing another 

 disk beneath. Uncini with about 13 teeth, the last large and 

 notched on the end ; well figured by Mcintosh. 



The genus Spirobranchus to which Mcintosh referred his 

 species differs not only in having a calcareous end on, the 



