BIOLOGY. 
Verm. 23 
genesis of Ascaris megalocephala bivalens; Sebaschnikoff. — G rowth of 
ovum in the Chcetognatha; Aida (2). 
Chemical composition of nucleolus in Nephthys and Spiophanes ; 
Michel (4). 
The origin of the centrosomes and first segmentation spindle in Myzo- 
stoma ; Kostanecki (1). — Maturation, fertilisation and early cleavage in 
Myzostoma ; Wheeler. 
Fertilisation of egg in Ascaris megalocephala ; Carnoy & Lebrun, 
Erlanger (1), Kostanecki (2) and Kostanecki & Siedlecki: of 
Rhabditis ; Erlanger (2). — Maturation of egg, fertilisation and segmenta- 
tion in Poly clads — the first polar body being very largo and penetrated 
by a spermatozoon as well as the egg-cell, after each giving off' their 
second polar body, thus giving rise to two fertilised eggs and two gastrulce 
in about half the number of eggs of six large specimens of Prosthecereus 
vittatus; Francotte. — M aturation and fertilisation of egg in this same 
species ; Klinckowstrom. 
Development and Life-History. 
Development of Spirorbis borealis ; Schiveley. 
Early development in marine annelids, influence of heat and light on 
cleavage; Mead. — C ytogeny of 4 marine annelids with equal cleavage; 
Treadwell. — C leavage of Arenicola cristata and the mosaic theory; 
Child (1) & (2). — Pseudopodial filaments of cleavage cells in Serpida; 
Andrews. 
Embryology of Cestodes; Braun (3) pp. 1461-1534. — Variations in 
the development of the 6-hooked embryo in Cysticercus T. microstomce; 
v. Linstow, Arch. mikr. Anat. xlviii, p. 109. — Post-embryonic develop- 
ment of Aspidogaster ; Stafford. 
Development of Tetrastemma vermiculus , Qfg; Lebedinsky (1): and 
other nemertines ; Lebedinsky (2). 
Share taken by the different germinal layers in the formation of organs 
in the asexually- produced Clicetog aster ; Bock. 
Embryonic development of Ascaris megalocephala ; zur Strassen. 
Life-history of Anchylostomum duodenale ; Looss : of Gordiidue ; Came- 
rano (4). [See also under Reproduction.] 
Regeneration. 
In earthworms, shewing that there is an anterior limit at which repro- 
duction of a new tail does not take place; Hescheler (1), Morgan, 
Michel (1) p. 336. — Regenerative power shewn to be much less limited in 
some species and to be the greater the smaller the piece regenerated from, 
and the nearer it is to the middle region of the body ; Korschelt. — R e- 
generation after transplantation in earthworms; Joest. 
In Polychcetes: in Nephthys ; Hescheler (1): in Typosyllis, Phyllodoce , 
Spiophanes, Cirratulus; Michel (1) pp. 313, 315, 385. 
Histological processes in the regeneration of chsetopods: origin of the 
new cerebral ganglion and commissures and of the stomodooum ; Hes- 
cheler (2): of Stomodoeum in Lumbriculus ; v. Wagner. — E ctodermic 
origin of caudal bud maintained; Michel (3), and (in Naids) Hepke. — 
Persistence of aperture of posterior section as the anus in earthworms and 
marine worms; Michel (2). [See also under Reproduction (asexual) 
p. 22.] 
Regeneration in Nemertines (Linens); Brown, A. 
Reproduction of the whole animal from very minute pieces in Planarians ; 
Randolph. — R egeneration of pharynx in Triclads ; Jander. 
A probable case of Heteromorphosis in a Cirratulid; M^snil & 
Caullery (1). 
