562 PROCEEDINGS OF THE AMERICAN ACADEMY. 



nerve fibres are connected either directly or indirectly — through the in- 

 tervention of a peripheral nerve plexus — with the eighteen longitudinal 

 nerves of the proboscis. 



6. There are two basal nuclei that belong to cells which probably 

 have the function of cover cells. 



It remains to be said that there enter each papilla besides nerve fibres, 

 connective-tissue fibres. These latter are found in close connection with 

 a finely granular substance, of which there is a particularly dense and 

 deeply staining layer immediately under the cuticula. Standing out in 

 contrast to the deeply stained granular or fibrous surrounding substance 

 are the clear, generally rounded vacuoles. 



If there is any differentiation in function between papillae, it is not 

 correlated with any pronounced difference in structure. 



Bibliography. 

 Ehlers, E. 



'64-68. Die Borstenwiirmer (Annelida chaetopoda) nach systemati- 

 schen und anatouiischeu Uutersuchungen dargestellt. Leipzig, xx + 748 

 pp., 24 Taf. 



Rath, O. vom 



'95. Zur Conservirungstechnik. Anat. Anzeiger, Bd. 11, No. 9, pp. 280- 



288. 



