jgiy-] J. Stephenson : Indian Oligochaeta. 407 



tion ; some of these variations are shown in the figures of sperma- 

 thecae from the dissected specimens (fig. 26) 



The penial and copulatory setae have the shapes previously 

 described. In some of the copulatory setae of segment viii , towards 

 the base what I previously described as a lateral flange cut up 

 into teeth appears rather as a series of distinct spines curved like 

 petals or scales, applied to the surface of the seta (fig. 27). 



Octochaetus castellanus, sp. nov. 



(PI. xvii, fig. 22; pi. xviii, figs. 23, 24). 



"^V. 134/1. Castle Rock, N. Kanara Dist., Bombay Pres. October 

 1916. S. \V. Kemp. A single specimen, in poor condition. 



External characters. — Length 48 mm. ; maximum diameter 2 

 mm. Colour ? Segments roughly 125 ; in some regions the sepa- 

 rate segments are not distinguishable. 

 Prostomium ? 



Dorsal pores perhaps from furrow 5/6. 



The setae are widely paired , aa = i^ ah = be ^ i^cd ; dd = 

 approximately half the circumference. 



The prostatic pores, on segments xvii and xix, are small 

 pits situated, in each segment, on a common elevation with a 

 rounded margin; the pores themselves are medial from the line of 

 setae a. The seminal grooves are bowed outwards, and run on 

 rather broad curved ridges, so that there is a circular depression 

 in the middle of the male area. 



The female aperture is single and midventral, on segment xiv. 

 The spermathecal apertures are perhaps indicated at the site 

 of setae a on segments viii and ix. 



Internal anatomy.— Septa g/ 10 and lo/ii are slightly thick- 

 ened ; all are present after the first few. 



There is a long, soft, and bulged portion of the oesophagus in 

 front of the gizzard ; the gizzard is conspicuous, relatively large, 

 barrel-shaped, situated in segment vii. There is one pair of cal- 

 careous glands in xiv, of moderate size and symmetrical. 



The nephridia cannot be identified on the body- wall ; there 

 are large tufts at the side of the oesophagus, in front of the giz- 

 zard and spermathecae. 



The testes were not identified ; funnels were present, free, in 

 segments x and xi, the largest seeming to be that in the hinder 

 segment on the left side, but 1 would not lay any stress on this 

 slight difference. Seminal vesicles are present in segment xii ; 

 they are deeply lobed, and rather small. 



The prostates are in segments xvii and xix ; they are relatively 

 small, and thrown into several loops ; the duct, thin, semi- 

 transparent, and apparently not muscular, is half as wide as the 

 opaque glandular part, and runs straight inwards. 



The spermathecae (fig. 22) are two pairs of rather small or- 

 gans situated near the middle line. The ampulla is spherical, 

 and the duct, with a rather curved course, is about as long as the 



