Camekon. — Ne jilirld i II til nf .XFadi'idiilus rosac Bcdthird. 189 



mos* Striking' featuie of these netwoi-ks is the strict ])urallciisiu wlucli obtains 

 throughout between ' artery ' and " vein ' : they are not. indeed, strictly 

 speaking, " networks ' ; each small ' artery " loops round and becomes a 

 small ■' vein.' " In Maoiiilrihis such loo])S ai'e easily recognizalile. 



Though the other parts of the nephiidium have such an elaborate 

 vascular system, with a complete investment of capillaries, yet the bladder 

 has very few vessels. The hrst two nephridia are supplied with blood by 

 a large branch from the extreme anterior end of the lateral vessel : this 

 breaks up on the underside of the nephridia into a number of small 

 branches, which reunite to form the efferent V('ss«^]s, taking back blood 

 to the anterior end of the ventral vessel. 



In all the nephridia examined it was particularly noted that there were 

 no dilatations in the blood-vessels such as are to be seen on the nephridium 

 of Lumhriciis. On the other hand, in Plagiochaefa iiiojifdiia, afterwards 

 examined, tlieae dilatations were numerous and large, though they occurred 

 irregidarly, and were not present in every nephridium. 



List of Monographs referred to [.\ the Text. 



1. Beddard. "On the Specific Characters and Structure of certain New 



Zealand Earthworms."" P.Z.8., 1885, p. 810. 



2. Beddai'd '" On the Structure of a New Genus of Luuibricidae, T/kuhho- 



drihis <jHli.elmi." P.Z.S., 1887, p. 154. 



3. Beddard. "" Contributions to the .Vnatomv of Earthworms: IV.' 



P.Z.S.. 1887, p. 544 {Cn/ptodrihis fletcheil)'. 

 ^. Beddard. '' On certain Points in the Structure of Urochaela, &c., with 



Remarks on the Nephridia of Earthworms."" Quart. Journ. Micro. 



Sci., vol. 29, 1889, p. 235. 

 5. Beddard. "A New Genus of (>li(/oc/i(ief.(i.'' Qiuirt. .lourn. .Micro. Sci., 



vol. 31. 1890, p. 4(}7. 

 <i. Beddard. "' Anal Nephridia in Acaidhodrdus undlipoius." ()uart. 



Journ. Micro. Sci., vol. 31., 1890, p. 479. 



7. Beddard. "' Mojiogi-aph of the Order Olnjochaela." Oxford, 1895. 



8. Benham. "" Studies on Earthworms : I. M inochdefd rappi ." Quart. 



Journ. Micro. Sci., vol. 26, 1886, p. 267. 



9. Benham. '"' An Attempt to Classifv Earthwcnius."' (^)iiait. Journ. 



Micro. Sci., vol. 31, 1890, p. 201. 

 Id. Benham. " The Nephridium of L'nid>n'c'is." (^uai't. Jouin. Micro. 

 Sci., vol. 32, 1891, p. 293. 



11. Benham. " Notes on Two AcantlKJclriloid Earthworms from New Zea- 



land." Quart. Journ. Micro. Sci., vol. 33, 1892. p. 292. 



12. Benham. "" An Account of Araiilliodrihis /d/</iiiosiis." Ti'aiis. N.Z. 



Inst., vol. 23, 1900, p. 122. 



13. Borelli. "' Sul I'apporte fra i nefiidii et le setole nei L<uiibrici ante- 



clitelliana."" Boll. Mus. Zool. Torino, vol. 2, No. 27. 



14. Bourne. 'On certain Points in the Development and .Viiatoniy of 



certain Earthworms." (ibiart. Journ. Micro. Sci.. noI. 36. 1894, ]>. 11. 



15. Bourne. " Moiidiqastcr i/niiH/is." (^)uart. Joui'u. .Vjicro. Sci.. v(»l. 36. 



1894, ]). 307. 



16. Eisen. " Californian Endrdidac." .Mem. Cal. .\.cad. Sci., vol. 2, No. 3. 



1894. p. 21. 



17. Kisen. " Pacific Coast ()li(/(ic/i(it'/(( : \ ." Mem. Cal. Acad. Sci.. vol. 2. 



p. 63. 



