TITLES, BIOLOGY. Tan. 3 
Salensky, W. Beitrage zur Entwickelungsgeschichte der Synascidien. 
ii. IJeber die Entwickelung von Vidcmnum nivcum . in. Allgemciner 
Theil. Mt. Stat. Neapel, xi, pp. 488-G30, 4 pis. 
Schneider, R. Die neuesten Beobachtungen fiber natiirlicbe Eisen- 
resorption in thierisohen Zellkernen. Op. cit. xii, pp. 208-216, pi. viii. 
Seeliger, O. Tunicata (Mantelthiere), in Bronn’s Klassen und Ord- 
nungen. Bd. iii, Suppl. Lief. 4-5. Leipzig. 
. Die “Segmentation” des Ruderschwanzes der Appendicularien. 
Zusammenfassende Uebersicht. Zool. Ceutralbl. ii, pp. 609-614. 
. Die Pyrosomen der Plankton-Expedition. Ergeb. Plankton- 
Exped. ii, E b., 95 pp,, yii pis. 
Sluiter, C. Pii. Tunioaten. In Semon, Zool. Forsch. i. Australien, 
&c. Jena. Deuksch. viii, 163-186, taf. vi-x. 
Winiwarter, H. v. Note sur la glande annexe du tube digestif des 
Ascidies simples. Arch. Biol, xiv, pp. 261-273, pi. xi. 
II. BIOLOGY. 
ANATOMY, EMBRYOLOGY, PHYSIOLOGY, and GENERAL. 
a. General. 
Seeliger gives, in his Plankton report, what is practically a mono- 
graph or revision of the Pyrosomidaz. He deals both with the structure 
and the systematic of the group, and recognises in all 6 species, 2 of which 
are new. 
Sluiter, in the introduction to his account of the Tunicata collcctod 
in Australian Seas by Prof. Semon, discusses the various proposed classi- 
fications of the Tunicata. He adheres to the old established division of 
the group into 1, Larvacea\ 2, Thaliacea ; and 3, Ascidiacea ; but 
establishes 3 new suborders as divisions of the Ascidiacea. They are 
a, Ascidiacea socialia ; B, Asc. mcrosomata ; and c, Asc. simplicia. His 
chief point is that the Polystyelidaz and the Botryllidce should be detached 
from the compound Ascidians, and linked to the simple. 
Caullery gives a number of general observations on the structure 
and life of compound Ascidians of the English Channel. He deals with 
such subjects as seasonal changes and the effects of mutilation. 
Caullery, in another paper, discusses the structure and systematic 
position of Savigny’s genus Sigillina , and places it with Polyclinopsis in a 
new family, the Polyclinopsidoz. 
Schneider discusses the presence of iron in the nuclei of various 
tissues of Clavclina rissodna ; Mt. Stat. Neapel, xii, p. 211, pi. viii, fig. 1. 
