POLYCMTA, OLIGOCH/ETA. 
Verm. 29 
from the peritoneal covering of the nephridia. Kleinenberg missed the 
ncphridia altogether, and mistook their external pores for the openings 
of invaginations to form the testis and ovary. 
Malaquin (l) distinguishes between asexual multiplication by simple 
fission and by budding. By the first method, several segments of the 
stock-individual are involved in the formation of new individuals, while 
by the second, only the anal segment is so involved, the remainder of the 
new individual budding out from the prseanal segment of the stock. In 
some species of Autolytus the first method occurs, in others both occur, 
thus giving rise to multiple stolons, while in Myrianida only the second 
method — budding — occurs. 
Wistinghausen describes the segmentation and formation of the 
germinal layers in Nereis dumerilii. He has also come to certain con- 
clusions as to the relations between the Nereis and Heteronereis forms, 
which differ somewhat from those of Claparede. The young N. dumerilii 
oithor becomes sexually mature as Nereis , when it has reached a length of 
15-30 m.m., or it changes itself into the small Ileteronereis , which then 
becomes mature. The eggs of the ripe N. dumerilii contaiu a quantity 
of yolk, are laid in tubes and develop directly. The small Heteronweis 
occurs pelagically in large numbers in the spring, and the eggs are laid in 
gelatinous masses at the surface of the water. They contain only a small 
amount of yolk, and develop indirectly, i.e., with metamorphosis (Trocho- 
phore). For certain unknown reasons some Nereis forms, after having 
reached the above-mentioned length, at which many of them become 
mature, do not develop sexual organs, but grow still longer up to about 
65 m.m., and eventually become metamorphosed into the large Hetei'o- 
nereis , which then becomes mature. The eggs of the latter contain some 
yolk, and are laid in tubes. Their development is unknown. The large 
Heteronereis never occurs pelagically. 
OLIGOCELETA. 
New Genera, Species and Varieties (including their 
Anatomy). 
Allolobophora leoni, jassyensis, p. 15, antipce , p. 16, Roumania, lissa- 
ensis , p. 18,. Mediterranean Region, Michaelsen (1); A. madeirensi*, 
Madeira, id. (3) p. 206 ; A.japonica , Japan, id. (4), preliminary diagnosis 
in footnote : n. spp. 
Benhamia bolavi , Hamburg, id. (1), pp. 9-14 ; B. tenuis , West Africa, 
id. (1), p. 21 ; B. intermedia , Togo Land, id. (3) : n. spp. 
Dichogaster hupferi , West Africa, id. (2) p. 66 ; D. mimus, Accra, id. 
(3), p. 212 : n. spp. 
JEiuinia, n. g., for E. equatorialis ) n. sp., Equat. Africa ; Benham (2). 
EudHloides titanotus , Zanzibar, Michaelsen, (2) p. 10, n. sp. 
Eudrilus jullieni , Horst (5) ; E. pallidus i Accra, Michaelsen, (3) 
pp. 216-219 : n. spp. 
