NOTES ON LARV/E OF POLYGORDIUS APPEND1CULATUS I2/ 



There is no doubt but what the diatom method is a most useful 

 one in rearing well-developed larvae taken from the tow. 



In Fig. 2 is shown the anal segment of a Polygordius, i 5 mm. 

 in length, raised by the diatom method. The characteristic anal 



FIG. 2. Anal segment of a specimen of P. appendiculaiits, X '35- 



filaments in this specimen are almost three times the length of 

 the anal segment, as in P. appendiculatus as figured and described 

 by Fraipont. 



Sections of the anal filaments show that they are ectoderma. 

 outgrowths surrounded by a cuticle which is continuous with that 

 of the rest of the worm. They are without lumens and the cells 

 seem to be like those of the ectoderm of other parts of the 

 body of the worm. It is possible that the organs have a sensory 

 function, although they are not at all active and are not ciliated. 

 The ring of glandular papillae" present in the larva persists in the 

 adult. In the oldest specimen that the writer has, the superior 

 anal lip is not as distinctly divided into lobes as Fraipont figures, 

 but there is some indication of differentiation into lobes. 



Fif.S 



FIG. 



Cephalic segment of the same specimen as that of Fig. 2, X *35- 



The cephalic tentacles (Fig. 3) are seen to be without setae and 

 longer than in other species, as is the case in P. appendiculatus 



