IJEPOirr ox THK OLir.OCH.ETA BENHAM. 20/ 



.Viiteri(n-lv tliere are three oi- fuur chietie in eacli dorsal 

 bundle, of which one or two are caj)iIliforms. After the clitelluni, 

 only crochets are px-esent, and usually two per bundle. 



The ventral cluette are crochets to the number of two or three 

 in each bundle. They are slenfler and short, measuring ()()S nun.' 

 the upper (distal) tooth is nearly twice the length of the jjroxiinal, 

 and is much slenderer (PI. xlvi., fig. 7). 



The arrangement of the chivtie is as follows : — ■ 



Segment ... ii. iii. iv. v. \ i. vii. viii. ix. x. xi. xii. 

 Crochets ... 222:12:12 2222 

 Capilliforms 2 1 2 l) 1 1 1 10 



On the segment xi. the ventral cluet^e are characteristically 

 arranged in a bunch — the bases divergent, the tips all close to- 

 gether, projecting through a pore on a small papilla (PL 

 xlvi., tig. 11) — this bunch of four to six chjeta:-, instead 

 of being arranged transversely to the axis of the body, 

 is sagittal,'^ and hence consjjicuous in an entire specimen. 

 The copulatory ch;et;e, are thus arranged in a reverse way 

 from the normal ventrals, but in form, the iiidi\idual 

 copulatory cluetie are crochets, nearly twice the length of 

 the ventrals, measuring 0-15 mm. The bases of these are 

 surrounded by a group of muscles, but there is no special gland. 



The ClUeUum covers the segment h x., xi., xii. Tlie male pore 

 is on xi., just outside of and anterior to the copulatoiy ch;etje. 

 In section, a furrow is seen to run backwards from the pore to the 

 level of the cluet;e, possibly indicating that in copulation such a 

 furrow is formed for the transference of the spermatzoa from the 

 male pore to the spermatheca of another worm, and corresjwnds 

 to the "spermatic groove " in Acanthodriline Earthworms. 



The spermathecal pore is situated near the anterior margin of 

 .segment x., and occupies an unusual position, in that it lies near 

 the lateral line of the body, al)Out midway between the dorsal and 

 ventniJ cha4al rows (PL xhi., tig. 10). 



Internal Anatomy : — 



ReprodKctiv'^ Sijsfpm. — The testes, ovaries, etc., occupy the 

 usual segments. The sperm sac is median, and extends through 

 segments xi. to xvL, while the four preceding segments, vii. to x., 



* 1 t'liul the i/opulatun c-lia'tif of Taiipodrilus simplex, Benliain, to have 

 tliis (lispositiuii, wliicli is a])])aivntly shown in Stoic's fimiiT of B. 

 fjifiodrilt's) coccinea. 



