BY E. J. GODDARD. 783 



strongly developed as in A. notabilis. Each latero-ventral 

 bundle contains two setae which differ slightly from each other. 

 Each is sigmoid, but in the one case the S is much more elongate 

 (/), and the extremity faintly bi6d or quite simple; in the other 

 case the curve-contour is more typically S-like, and the extremity 

 shows a distinctly bifid character due to the presence of a small 

 tooth, and the consequent appearance of a notch on the convex 

 side of the free end of the seta. 



Dorsal setae are present in all the segments, except the first 

 two, segments xii. and xiii., and the last few segments, as a single 

 row on each side of the body. They are capilliform, but show a 

 faint sigmoid contour. The portion of each seta within the 

 body- wall is of uniform importance, but beyond this the seta 

 becomes attenuated strongly towards the fine free extremity, and 

 this free portion of the seta shows the sigmoid character feebly. 

 As in the case of the ventral setae, the dorsal setae are most 

 strongly developed in the postclitellar region, and especially so 

 in that portion which is comprised in the posterior half of the 

 body. 



Pores. — The male genital apertures are paired openings 

 situated in the lateral region of the ventral surface of the anterior 

 region of segment xii. The female apertures are paired, and 

 open in the lateral region of the ventral surface of the anterior 

 region of segment xiii., exactly in the middle of the clitellar 

 region. 



No traces of spermathecal apertures are to be seen, this con 

 dition representing the extreme shown by the tendency towards 

 disappearance of traces of the same in A. notabilis. 



Alimentary canal. — The buccal cavity extends upwards and 

 backwards to the middle portion of the body in the posterior 

 region of the buccal segment as a wide passage, sending off 

 backwards a pouch (v-shaped in vertical longitudinal section) 

 into the ventral region of that segment, ventral to the nerve-cord. 

 It is lined-by a nonciliated, flattened, stratified epithelium with 

 spherical nuclei. 



