STUDIES ON EARTHWORMS. 223 
duct opens into an oval muscular pouch. No spermathece 
nor ovaries were found. 
Rhinodrilus (R. paradoxus, from Venezuela).—Length 
15 cm., breadth 3 or 4mm. Prostomium elongated to form 
a proboscis 3 to 6mm.long. The clitellum occupies somites 
X1X,xx,xxI. The sete are in four couples,and are ornamented 
with two series of semicircular folds, with a concavity towards 
the free end. The nephridiopores are in a line with the 
lateral or outer couple of setz (the sete 3 and 4). The male 
pores are between somites x1x and xx in a transverse groove 
No spermathece were found. 
Eudrilus.—The clitellum occupies somites x111 to xv, or 
xu to xvii. The sete are in four couples in each somite. 
The nephridiopores are in line with the lateral couple of 
sete. The male pores in line with the ventral (1 and 2) sete 
in xvi. There is a curved chitinous penis in a sac (modified 
penial seta) ; a prostate is present. The female genital organs 
are very peculiar: the ovary is fixed to the oviduct and to the 
spermatheca, according to Perrier’s interpretation of the parts. 
He describes three species, all about the size of the common 
Earthworm : 
Ku. decipiens, from the West Indies. 
Eu. Lacazii, from Martinique. 
Eu. peregrinus, from Rio Janeiro. 
Acanthodrilus.—The clitellum occupies somites xiv to 
xvi1, and completely surrounds the body. The setz are in 
four couples in each somite. The nephridiopores are in 
line with the lateral couple of sete (8, 4). The male pores 
are four in number in somites xvi11 and xx in line with sete 1 
and 2; at each pore is a penis formed of a bundle of setzx in 
asac. The genital organs are not altogether understood, and 
differ in each of the three species. 
Ac. obtusus, from New Caledonia.—Length 66 cm. Penial 
setz are blunt. 
Ac. ungulatus, from New Caledonia.—Length 1 dem. 
Penial sete are recurved. 
Ac. verticillatus, from Madagascar.—Length 350 mm., 
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