494 PROCEEDIXGS OF THE ACADEMY OF [ J Illy , 



segments; the setse three or four (3 or 4) in a fascicle rather stiff, very 

 long, regularly tapered from an angular base with conspicuously 

 serrate edge; along the caudal region replaced by long hair-like ones. 



As far as Schmarda's description and figures of Protula longiseta 

 from the coral reefs of Jamaica shows, this species agrees fairly well. 

 The Bermuda form, however, cannot be placed in the genus P. sygmo- 

 <branchus. in which Schmarda's species has been placed, as the type 

 (P. protensus Gm.) as given by Claparede, 1870, has small branchial 

 Jobes with numerous branchiae in a circle, seven (7) thoracic segments, 

 but with the collar entire and the uncini very distinctive, somewhat 

 resembling those of Protula. No genus is known that can include this 

 Bermuda form, therefore the new name Subprotula is proposed with 

 the specific name longiseta, avoiding multiplicity of names if it prove 

 to be the same as Schmarda's species. 



A fragment of a tube about 2.5 mm. in diameter is of especial interest 

 in having a tough, horn-colored, semitransparent, chitinous lining; 

 the calcareous covering is thick, its surface nearly smooth, without 

 markings of any kind, even lines of growth. The animal, about 20 mm. 

 in length, is destitute of an operculum, a very small protuberance on 

 outside of the base of one of the branchial lobes showing point of 

 attachment. The branchial lobes small, stem-like; the branchiae 

 (16 on each side) much curled and twisted in preservation are arranged 

 in a semicircle. Thoracic membrane well developed, forms a deep 

 rolling collar, apparently 3-lobed (mutilated), extends backward as a 

 free lateral border to the 5th fascicle of seta\; no posterior border. 

 Seven (7) fascicle of seta? and six (6) tori on thorax; the latter in 

 rseparate rectangular membranous areas successively increasing in 

 :*>ize. Setse numerous, very long and slender, none showing broadened 

 conspicuously serrate ends. Uncini much striated, approaching 

 Protula in form, but with coarser teeth (about 16 in largest), the last 

 moderately long and square-cut. 



The conspicuously developed chitinous lining of this tube is remark- 

 able. The character of the animal agree closely with S. longiseta, with 

 the exception of the small protuberance noted on the base of one of 

 the branchial lobes. This may possibly be an abnormality and not the 

 point of attachment of a lost operculum. 



"l assimilis (Mcintosh, as Placostegus) . 



This species is recorded by Mcintosh from off Bermuda, in 435 

 fathoms. 



The tube is glassy, ornamented wuth a dorsal, or median, and two 

 Ilateral ridges, which terminate at the aperture in tooth-like projections. 



