290 BUSH 



They are more or less sigmoid, either isolated or in masses, usually 

 attached their entire length but when too crowded lifting themselves 

 outward, forming a free end. Their surface is roughened by unequal 

 concentric growth lines and they are opaque except for a very small 

 semitransparent portion which in dried specimens is usually about the 

 middle, revealing the position of the minute yellow animal. 



Length varying from 5—8 mm. ; diameter about 4- mm. 



These tubes were supposed to belong to some species of Filograna ; 

 the animals, however, after treatment with potash solution, were 

 found to differ from those of that genus in possessing an operculum. 

 This is remarkable for the form, size, and arrangement of the spine- 

 like processes covering the thin chitinous disk which protects its end. 

 They are long, blunt, light horn-color, differ greatly in size and form, 

 and appear to be arranged in three alternating series forming a rosette ; 

 those of the outer and middle series being very irregular in outline, 

 differing greatly in number and position of the irregularities ; those 

 of the inner series more nvunerous (about 24) , smaller, simple, tapered 

 and obliquely truncated. 



No setae were found on the collar, w^hich is apparently without inci- 

 sions or clefts, shallow across the back, deep along the sides and in 

 front with angular dorso-lateral corners. 



Thoracic segments defined only by the 5 or 6 series of uncini and 

 small fascicles of setse. Abdomen with uncini only, apparently 

 arranged in a single series, along the median area. The surface on 

 the opposite portion of the body covered with long unequal ribbon- 

 like processes resembling in form the spine-like ones on the opercular 

 plate. 



Length of the largest perfect animal |^ mm. 



Genus Josephella Caullery and Mesnil (? ). (See p. 226.) 

 Tubes similar to those given above as belonging to Rhodopsis 

 pusilhis from Bermuda were found on JSIargaritifera from Beirut, 

 Syria, but the animal is very dissimilar, being elongated with a simple 

 operculum on which the chitinous plate has a deep erect transparent 

 rim strengthened on its upper surface by long, tapered spine-like pro- 

 cesses often with secondary spinules. There are 5 thoracic fascicles 

 of tapered setae and 4 series of uncini ; on the following segments the 

 tori with a few uncini and one very slender tapered seta are well sepa- 

 rated along the middle region of the body, but more crowded posteri- 

 orly ; the caudal portion was not found. The setae below the collar 

 fascicle are bent at the base of the blade and the uncini have a com- 



