BY E. J. GODDARD. 847 



elongate and narrow, the curves being much less marked than in 

 the case of the shorter seta; there is no trace of a nodulus; the 

 extremity is simple. This form of seta measures 0*195 mm. 

 Towards the posterior extremity the setae are much more pro- 

 minent than in the region anterior to the last dozen or so 

 segments. In shape, size, and the character of the free extremity 

 these setae approximate very closely to those of P. mauiensis. 



Digestive system. — The pharynx extends back as far as the 

 posterior extremity of segment v. It is lined by a ciliated 

 epithelium of tall columnar cells, outside which lies a loosely 

 arranged mass of longitudinal muscle-fibres. The intestine is 

 loaded with a mass of gritty material. Chloragogen cells make 

 their appearance in the posterior region of segment vii., but are 

 not pronouncedly developed anterior to segment viii., the region 

 of the canal between segments v. and vii. representing the oeso- 

 phagus. In segments vi.-viii., there is a paired mass of cells 

 which take a deep staiu with haematoxylin. These cells are 

 piriform in shape, the attenuated portion of each cell being 

 directed ventrally so that the duct-like portions of the various 

 cells tend to converge. Each cell has a nucleus of a spherical 

 shape, with a deeply stained nucleolus. The character of these 

 cells as regards shape, their large size, and the intensity of their 

 staining affinity certainly suggests that they are glandular in 

 function. No nephridia are to be made out in the three segments 

 containing these glandular structures, so that it would seem that 

 they are to be regarded as modified nephridia. In section a 

 very noticeable feature is an arborescent appearance about the 

 nephridia, the sections of the cells forming the boundaries of the 

 intracellular portion of the nephridium appearing to be arranged 

 alternately on either side of a central stem arranged dorso- 

 ventrally, after the fashion of branches from the main stem of a 

 tree. A similar arrangement is very noticeable in connection 

 with the glandular structures described above, and which are to 

 be regarded as peptonephridia, or nephridia which have under- 

 gone great enlargement and modification so as to act as salivary 



