Internal Anatomy (Plate 119, fig. 2)

Septa viii/ix, ix/x, x/xi, xi/xii, xii/xiii and xiii/xiv are thickened and muscular.

Alimentary Canal. A small, globular, muscular pharynx, covered dorsally by salivary glands, occupies the first four segments. The gizzard has thick, strongly muscular walls and lies in v. The oesophagus extends from vi to xvii and lacks oesophageal glands. The intestine commences in xviii, is thin walled, and has a typhlosole.

Vascular System. The dorsal blood vessel is paired throughout its length and the two vessels do not fuse at the intersegmental septa. There are four pairs of dilated hearts, a pair each in x, xi, xii and xiii.

Reproductive System. There are two pairs of polylobate testes, a pair in × and a pair in xi, and a single pair of polylobate ovaries in xiii. There are two pairs of spermathecae, a pair in viii and a pair in ix. Each spermatheca is in the form of a small ovoidal sac opening by a duct to the exterior. A number of small diverticula form a semicircle around the anterior and lateral aspects of the duct. (Plate 118, fig. 3.) There are two pairs of simple tubular convoluted prostates, a pair in xvii and a pair in xix. There are no penial chaetae. A single pair of racemose vesiculae seminales is present in xi.

Micronephridia are present in each segment except the first.

Dinodrilus montanus n.sp. (Plate 119, figs. 1–3)

This species was discovered in Rimutaka sandy loam in a remnant of beech forest quarter of a mile north along the ridge of the Rimutaka Range from the highest point on the Wellington-Featherston road. Only two specimens were obtained. It is pink in colour, with a reddish streak running along the mid-dorsal line from the posterior border of the clitellum to the anus. The clitellum is darker in colour than the remainder of the body and completely surrounds segments xiii–xvi.