Tan. i 
VI. TUNICATA. 
BY 
Professor W. A. Herdman, D.Sc., F.R.S. 
CONTENTS. 
Introduction . . 
I. Titles . . . . 
II. Biology . . . 
a. Anatomy 
n. Embryology 
c. Geographical 
III. Systematic 
Page 
1 
..... 2 
O 
3 
..... 4 
Distribution 0 
7 
INTRODUCTION. 
The most important papers of the year are certainly those upon develop- 
ment — both blastogenesis and embryogenesis — and not the least import- 
ant of these come from America. We owe to Castle a most detailed 
and careful account of the cell-lineage and early stages in the embryology 
of a Simple Ascidian ( Ciona ), while Ritter gives us his promised memoir 
on budding in Compound Ascidians ( Peropliora and Goodsiria). Hjort 
has also a memoir on the general subject of budding in these forms ; 
while Seeliger, Korotneff, Heider, and others, have papers on the 
development of various species of Salpa. 
Kiaer gives a useful revision of the Norwegian and Arctic Simple 
Ascidians. He discusses the tangled synonymy of several puzzling 
species, including Styela rusiica , L., in regard to which there has been 
much difference of opinion. He describes 4 new species and 36 pre- 
viously known. 
1896. [vol. XXXUT.] 
c 13 
