224, WILLIAM BLAXLAND BENHAM. 
breadth 8 mm. Penial setz are serrated. No clitellum was 
found. 
Digaster, from Australia.—Only one species is described— 
D.lumbricoides. The clitellum occupies somites xiv, xv, 
xvi. The male pores are in somite xvi. The sete are in 
four couples. The nephridiopores are in line with the outer 
of the ventral couple of sete. There are two gizzards; one in 
somite v, the second in somite vit. 
Perionyx.—The only species is P. excavatus, from 
Cochin China. The length is 120 mm., breadth 4mm. The 
clitellum occupies somites XIII, XIv, xv, xvI, xvul. The 
sete 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 xvit1. The spermathecal pores are 
close to one another on the ventral surface of the anterior 
edge of somites vir and 1x. There are no intestinal czxca. 
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 setze are in four couples 
in each somite. The nephridiopores are in front of the 
lateral couple. There are four male pores; two between 
somites vil and vili in line with sete 1 and 2, and two 
between somites x and x1 dorsad of these sete. There is one 
gizzard in somite vi, and a second extends through somites 
x11t to xx1z 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 XII, XIII, XIV, XV. 
Urocheta.—tThis 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 Lumbricine at 
the end of the paper. Only one species is known—Urocheta 
hystrix, which has been found in Martinique, Gloria, Java, 
