1889. ] OLIGOCHZLOUS FAUNA OF NEW ZEALAND. 379 
Dorsal blood-vessel completely double. 
Alimentary tract. The gizzard occupies segments vi. & vii. 
Calciferous glands appear as a dilatation of the walls of the cesopha- 
gus in segments xiv. & xv. 
Intersegmental septa dividing segments vii.-xii. specially thickened. 
Seminal sacs in segments ix., x., xi., xii.; those of the last two 
segments are racemose in appearance. 
Nephridia diffuse, with numerous external pores. 
Spermatheca furnished with a variable number of small diver- 
ticula. 
6. ACANTHODRILUS ROS, N. sp. 
Prostomium completely dividing the buccal segment. 
Sete strictly paired, the pairs, at least in the posterior region of the 
body, being equidistant. 
Clitellum extending over segments xiv.—xix. 
Dorsal pores present in the posterior segments of body. 
Dorsal blood-vessel double, but the two tubes unite at the point 
where they perforate the septa. 
Intersegmental septa not specially thickened in the anterior 
segments. 
Nephridia one pair to each segment, alternating in position, some- 
times opening by dorsal, sometimes by ventral pair of sete. 
Spermathece with a long muscular diverticulum, bearing at its 
extremity a cluster of small pouches. 
Genus Dreinopriuus, F. E. B. 
Deinodrilus, F. E. Beddard, Quart. Journ. Micr. Sci. vol. xxix. 
p- 105. 
Earthworms with 12 sete in each segment, arranged at approxi- 
mately equidistant intervals. Prostomium not completely dividing 
buccal lobe. Clitellum occupies 3 segments (xiv.—xvi.) as in Pericheta. 
Nephridia diffuse, opening on to exterior by numerous pores in each 
segment. Reproductive organs as in Acanthodrilus, i.e. two pairs of 
tubular atria opening on to segments xvii. and xix. Vasa deferentia 
open on segment xviii. Dorsal blood-vessel completely doable. 
7. DEINODRILUS BENHAMI, F. E. B. 
Deinodrilus benhami, F. E, Beddard, Quart. Journ. Micr. Sci. 
vol. xxix. p. 105. 
Genus Pertcuarta, Schmarda. 
Pericheta, Schmarda, Neue wirbellose Thiere, Bd. ii. p. 13. 
Megascolex, Horst, Notes from Leyd. Mus. vol. v. p. 182. 
Pericheta, Perrier, Nouv. Arch. Mus. t. viii. p. 96. 
As the arrangement of the species of this very large genus is under- 
going revision, I abstain from attempting a generic definition. The 
species described below perhaps merits generic separation, as it differs 
from most other species in such important points as the possession of 
tubular atria and paired nephridia. 
