Studies on Earthworms. - Journal of Cell Science

224 WILLIAM BLAXLAND BENHAM.
breadth 8 mm. Penial setas are serrated. No clitellum was
found.
Disaster, from Australia.—Only one species is described—
D. lumbricoides. The clitellum occupies somites xiv, xv,
xvi. The male pores are in somite xvm. The setse are in
four couples. The nephridiopores are in line with the outer
of the ventral couple of setse. There are two gizzards; one in
somite v, the second in somite vn.
Perionyx.—The only species is P. excavatus, from
Cochin China. The length is 120 mm., breadth 4 mm. The
clitellum occupies somites XIII, xiv, xv, xvi, xvn. The
setae are about 30 to each somite, and form a ring all round.
The nepridiopores are not visible, though nephridia are
present. The male pores are close together in a median
ventral fossa in somite XVIII. The spermathecal pores are
close to one another on the ventral surface of the anterior
edge of somites vm and ix. There are no intestinal caeca.
The ovaries are not pedunculated.
Moniligaster.—A single species, M. Deshayesii, from
Ceylon is described. Length 150 mm., breadth 6 mm. The
clitellum is absent altogether. The setse are in four couples
in each somite. The nephridiopores are in front of the
lateral couple. There are four male pores; two between
somites vn and vm in line with setse 1 and 2, and two
between somites X and xi dorsad of these setae. There is one
gizzard in somite vi, and a second extends through somites
XIII to xxii constricted into four nearly equal portions. The
genital organs are very complicated. The anterior and posterior
seminal reservoirs differ from one another. The ovary is very
exceptional in that it is a long sac, lying above, and on each
side of the alimentary tract, in somites xn, XIII, xiv, xv.
Urochseia.—This is described in the same memoir as the
preceding genera, and also in a separate memoir (28), where
Perrier gives a very minute description of it, as well as an
exhaustive bibliography of the literature of the Lumbricinse at
ths end of the paper. Only one species is known—Urochasta
hystrix, which has been found in Martinique, Gloria, Java,