268 SUBANTARCTIC ISLANDS OP NEW ZEALAND. [OUguchaelu. 



Fam. MEGASCOLECIDAE. 

 Subfaiii. ACANTHODRILINAE. 

 NuTiODRiLUS, Miehaelst'ii, 18'J9. 

 Notiodrilus fallax, sp. iiov. (Plate XI, figs. 16, 17.) 



Tluee individuals. 



Colour. — Dark chocolate-brown (in formol) ; pigment extends over the ventral 

 surface. 



Dimensions. — The largest, which is a good deal contracted, is 175 mm. in 

 length and 1 1 mm. in diameter ; no doubt, in life it would have reached at least 

 200 mm. 



The prostoini((»i is epilobic about half, with a transverse groove, but no marginal 

 extensions backwards. The anterior segments are biannulate, the limits quite dis- 

 tinct ; the post-clitellar segments are triannulate. 



Chaetne. — In the mid-body ab = cd ; be about 1^ a6 ,• dd = Qah ; au = 2 ab — 

 that is, > be. In the precUtellar region ab < cd ; aa = be. 



The elitellum, which is very dark brown in colour, is saddle-shajaed, and ceases 

 at line b ; it covers segments 14-19, the ventral surface of which is pale yellowish. 



Genital Pores, cfec. — The spermatic groove is concave ventrally, and allows 

 both chaetae a and b to be seen in each of the segments 17, 18, and 19. Sjaerma- 

 thecal pores are invisible externally, but lie in the usual position. Nephridiopores, 

 as seen in section, are just below chaeta c. 



Internal Anatom.tj. 



The sefta behind segments 9-12 are very thick, and that of 13 nearly as thick. 



The dorsal vessel is double throughout ; hearts in 10-13. 



The gizzard is large, in the 6th segment ; oesophageal glands in 13 and 1-1. 



Nephridia very small, in a single row ; extend only from b to c ; those of the 

 4th segment are large pepto-nephridia, but whether they open into the gut or not 

 I did not ascertain, as the body is too contracted to allow me to trace them by dis- 

 section. 



The testes and ovaries are on the anterior wall of their segments: sperm-sacs 

 in 9 and 12 ; both are large, saclike, and but feebly racemose ; there are none in 

 the intervening segments. 



Prostates compressed, the tube being a good deal contorted, so as to form a 

 more compact mass than is common in the genus (Plate XI, fig. 17). Each is 

 limited to its own segment ; has a narrow duct, which passes transversely across 

 the body-wall for a distance equal to about half the breadth of the gland, to open 

 to the exterior in the line b. No penial chaetae are recognisable, and no "arcuate" 

 muscles are present in these segments 



Spermathecae. — Two pairs, in the 8th and 9th segments ; each has a couple 

 of glomerulate diverticula opening into the duct, close to the body-wall, on the 

 anterior and posterior aspects respectively (Plate XI, fig. 16). 



Locality. — Snares Island ; in company with N. haplocystis. 



