222 WILLIAM BLAXLAND BENHAM. 
the clitellum as occupying only one somite, which he calls 
XIII, instead of XIV, XV, XVI. 
We now come to the most important work of late years on 
Earthworms, in which the first attempt is made to consider the 
relations of different forms from an anatomical standpoint. 
It is here that the only rational classification and generic 
grouping of Harthworms is first given. I refer to Edmond 
Perrier’s works. 
In 1872 he published his researches on various Karthworms 
contained in the Paris museum (14). In this paper he de- 
scribes nine new genera, two new species of Lumbricus, and 
several new species of Pericheta. 
The following are the new genera and their chief cha- 
racters : 
Anteus (A. gigas, from Cayenne),—Its.length is 1 met. 16 
cm.,and breadth 38cm. The clitellum occupies somites xv to 
XXIXx, and is not continued across the ventral mid-line. The sete 
are in four couples in each somite. The nephridiopores are 
in a line with the uppermost seta of the lateral couple (i.e. with 
the fourth seta from the ventral mid-line). No sperm ducts 
could be found, but the nephridia in the somites xi to xIx are 
short simple tubes, which Perrier considers as sperm ducts. 
No accessory copulatory organs nor ovaries are found. There 
is a single pair of spermathece in somite vii. The anterior 
septa are very strong, and cover the pharynx, gizzard, and 
seminal reservoirs. 
Titanus (T. brasiliensis, from Brazil).—Length 1 met. 26 
em.,and breadth3cm. The clitellum occupies somites xv to 
xxmu1. The male pores are between somites xvi and XIx, 
and no nephridiopores exist in this somite. The sete are in 
four couples in each somite anteriorly, posteriorly become scat- 
tered, but do not alternate. The nephridiopores are in front 
of the second set, reckoning from the ventral mid-line, whether 
in couples or separate, that is to say, they are in line with the 
outer ventral setae. No nephridiopores exist anterior to somite 
xui. The seminal reservoirs are very long and consist of 
only one pair, extending from somite x1rto xxv. The sperm 
