THE CYTOLOGY OF THE SEA-SIDE EARWIG, 
ANISOLABIS MARITIMA BON. 
Part I 
SIDNEY I. KORNHAUSER 
^From the Zoological Laboratory of Denison University, and the Biological Labo- 
ratory of the Brooklyn Institute of Arts and Sciences at Cold Spring 
Harbor, Long Island 
WITH THREE PLATES 
CONTENTS 
1. Introduction 234 
2. Historical Review 235 
3. Methods 236 
4. The Gonads 237 
5. The Diploid Chromosomes 238 
6. The Spermatocyte Chromosomes 240 
7. Discussion 244 
8. Summary 245 
9. Bibliography 246 
10. Explanation of Plates 246 
1 . INTRODUCTION 
The forficulid, Anisolabis maritima Bon., which is found under 
the stones and riff-raff at the high-tide mark, is especially beauti- 
ful material for cytological study. The chromosomes are clear 
and distinct; the cytoplasmic structure, nicely demonstrable; 
and good preservation is not difficult. The differentiation of the 
oocyte and nurse cell and their subsequent growth present many 
interesting problems which will be taken up in another paper. 
The origin and distribution of mitochondria in both the sex 
and the embryonic cells may also be studied profitably in this 
species. For the present, the author has confined himself chiefly 
to the chromosome number, and the origin and fate of the sex- 
chromosomes in the male. The work was begun in the summer 
234 
