BY WILLIAM A. HASWELL. 339 



celles de l'ame d'une plume . . . Partout ils sont noyes dans 

 une mucosite parfaiternent transparente." . . . 



In his "Memoire sur la famille des Chlorerniens,"* he had 

 previously expressed the opinion that the granular contents, in 

 the case at least of some of the papillae, were continuous with 

 the epidermis. 



Claparedef gives the most complete account of the papillae. In 

 Stylarioides monilifer he states that their form appears usually 

 cylindrical, but adds that that is due to the encrusting layer of 

 mucus, on the removal of which the papilla appears in the form 

 of a spherical button at the end of a pedicle. Both pedicle and 

 button are formed of two layers, the more external of which is 

 homogeneous and is a continuation of the cuticle, while the other, 

 finely granular, is the subcuticular layer. He had not succeeded 

 by means of any re-agent in discovering any nuclei in the granular 

 layer. The same structures in Trophonia eruca he describes in 

 similar terms. 



In the case of SipJwnostoina diplochditos the same author 

 describes the peduncle of the papillae as formed of a cuticular 

 envelope and an axial granular layer with ill-defined longitudinal 

 fibrillation. In this axial substance, numerous elliptical nuclei, 

 having their long axes parallel with the axis of the peduncle, are 

 brought into view under the action of acetic acid. The base of 

 the club-like enlargement is filled with globular finely granular 

 masses without cellular structure. Further on the central sub- 

 stance re-assumes its ill-defined fibrillar structure, and terminates 

 in several pyriform bodies of a sulphur-yellow colour. He denies 

 the asserted vascularity of the papillae, and sets them down as 

 without doubt tactile organs. 



Grubej comes back to the view of Costa and Leuckart that the 

 papillse are concerned with the secretion of the layer of mucus. 



* 'Ann. Sci. Nat.' 3e sene, tome xn. (1849), p. 277. 

 t " Les Annelides Ch^topodes du Golfe de Naples," p. 357 (1868). 

 % " Bemerkungen iiber die Familie der Chlorhaeminen." * Bericht der 

 Schles. Gesellsch.' 1876, p. 37. 

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