4,74. FRANK E. BEDDARD. 
I may also take this opportunity of remarking that there is 
a subneural blood-vessel in Thamnodrilus. 
Summary. 
The more important new facts contained in the present paper 
are the following : 
(1) Description of Acanthodrilus antarcticus, A. 
Rose, A. Dalei, nn. spp. 
(2) The ciliation of the spermathecal appendix iu A. Rose. 
(3) The presence in Eudrilus of two pairs of ovaries, con- 
nected by oviducts with a single aperture on each side; the 
oviducts are continuous with the ovaries. 
(4) The description of Pericheta intermedia, n. sp., 
which differs from most species of Perichzta in having a 
single pair of nephridia in each segment, and in having a 
tubular atrium like that of Acanthodrilus. 
(5) The presence of functional egg-sacs in the same species, 
in which the ova undergo their development surrounded by a 
follicular epithelium and with a mass of germinal cells attached 
to one pole, as in certain “ Limicole,” &c. 
(6) The presence of a peripheral nerve plexus in Pericheta, 
specially developed in the neighbourhood of the sete. 
(7) The presence of a subintestinal blood-vessel in Acan- 
thodrilus. 
(8) The presence of a subneural blood-vessel in Peri- 
cheeta. 
(9) Description of the minute structure of the spermathece 
and the spermathecal appendices in Pericheta and Acan- 
thodrilus; spermatozoa are only found in the appendices, 
the epithelium of which has largely undergone degeneration 
into a viscous substance, in which the spermatozoa are 
embedded. 
(10) Description of some epidermic glands in Pericheta, 
which are possibly equivalent to the capsulogenous glands of 
Lumbricus. 
(11) Description of certain organs in Pericheta and Acan- 
