292 WILLIAM BLAXLAND BENHAM. 
(5) The very large size, and complicated structure, of the 
nephridia themselves. 
(6) The excessively strong septa of the anterior somites, 
being much thicker than those figured for other large Earth- 
worms. 
(7) The great number and small size of the spermathece. 
(8) The position of the spermathece behind the other genital 
organs, and the presence of more than one pair in a somite. 
(9) The intestinal gland in somite 1x, with a structure simi- 
lar to that of the calciferous cesophageal glands of Lumbricus 
agricola. 
(10) The bifurcation of the dorsal trunk in each of the . 
anterior somites (Iv to virt), and the union of these divisions 
before passing through the anterior septa of these somites. 
(11) The great enlargement and thickening of the wall of 
the dorsal vessel in somite viit. 
(12) The curious structures, with unknown function, in 
somite XII. 
(13) The position of the supra-pharyngeal ganglion in the 
somite I. 
(14) The absence of a sub-neural blood-vessel. 
BIBLIOGRAPHY. 
. Savieny.—‘“‘ Systeme des Annelides,” ‘ Description de Egypte,’ t. xxiii. 
. Duets.—‘ Ann. des sci, nat.,’ series 2, t. viii, p. 15. 
. Von StzsoLtp.—‘ Manuel d’anatomie comparée,’ t. i, pp. 216, 227, &c. 
. D’' Upexem.—“ Developt. du Lombric terrestre” (‘ Mém. cour. mém. 
sav. etrang. Acad. Roy. Sci.,’ &., Bruxelles, t. xxvii, p. 20. 
5. Herine.— Zur anatomie und Physiologie der Generations-Organe der 
Regenwirmer ” (‘ Zeit. fur wiss. Zool.,’ t. viii, 1856, p. 400, pl. xviii). 
6. Fraissr.—‘ Ueber Spermatophoren, &c.” (‘ Arbeit. Zool. Zoot. Instit. 
Wurzburg,’ vol. 5, 1882, p. 343). 
7. BuomrreLp.—“ Develop. Spermatozoa of Lumbricus” (‘ Q. Journ. Micr. 
Sci.,’ xx, 1880, p. 79). 
8. Lzo.— Dissert. inaug. de Struct. Lumbrici terrestris,” 1820. 
9. p’ Uprxem.—* Hist. nat. du Tubifex rivulorum ” (*‘ Mém. cour. mém. sav. 
etrang. Acad. Roy. Sci.,’ &c., Bruxelles, t. xxvi, p. 17). 
mo ~O 
