128 Transactions. — Zoology. 



Bibliography. 



(1.) Benham : " A Re-examination of Hutton's Types of New 



Zealand Earthworms." Trans. N.Z. Inst., vol. xxxi., 



1898, p. 156. 

 (2.) Hutton : " On the New Zealand Earthworms in the Otago 



Museum." Trans. N.Z. Inst., vol. ix., 1876, p. 351. 

 (3.) Beddard: "On the Specific Characters of certain New 



Zealand Earthworms." Proc. Zool. Soc, 1885, 



p. 813.* 

 (4.) Beddard : " On some New Species of Earthworms from 



Various Parts of the World." Proc. Zool. Soc, 1892, 



p. 668. 

 (5) Michaelsen : " Oligochseten v. den Inseln der Pacific." 



Zool. Jahrbuch, Abth. f. System, &c, vol. 12, 1899, 



p. 234. 



EXPLANATION OP PLATE V. 

 Acanthodrilus uliginosus. 



Fig. 1. Dorsal view of anterior end of the body ; twice natural size. 



Fig. 2. Ventral view of the segments 11 to 22, showing the extent of the 

 °' clitellum, the arrangement of the chset83 (as short lines) and nephri- 

 diopores (as small circles), and of the genital pores ; x 2. 



Fig. 3. Diagrammatic transverse section, showing arrangement of chsetfe, 

 intestine, and the difference between the "dorsal" and "ventral" 

 nephridia. 



Fig. 4. Diagrammatic view of the first twenty-one segments, showing the 

 alimentary system and part of the vascular system, as seen when the 

 body is out through along the dorsal mid-line and the wall pinned 

 aside ; about natural size. 



Fig. 5. Part of the vascular system : the dorsal vessel has been removed 

 ° in five segments to show the " supra-enteric vessel," with which the 

 large " enteric hearts " are connected. The " lateral hearts " in seg- 

 ments 8 and 9 arise from the dorsal vessel, as do aho the two 

 " lateral vessels " in the 9th segment. The supra-enteric vessel is 

 formed by the union of capillaries issuing from the "oesophageal 

 glands." 



Fig. 6. Diagram of one of the ventral nephridia: t, the coiled .tubule; 

 3 /, funnel opening through the septum ; bl, the muscular bladder ; 

 o, its external aperture. 



Fig. 7. Diagrammatio view of the reproductive organs ; about natural 

 size. 



Fig. 8. A spermatheca, seen from the side : s, main copulatory sao ; 

 d, muscular duct ; div, diverticulum. 



Fig. 9. Normal chteta. 



Fig. 10. Copulatory chseta, magnified to exactly the same size as fig. 9. 



* Contains a somewhat detailed account of the anatomy of our worm. 



