680 
DAVID H. TENNENT 
BIBLIOGRAPHY 
Steinbruck, H. 1902 Ueber die Bastardbildung bei Strongylocentrotus lividus 
(cT) und Sphaerechinus granulans (?). Archiv f. Entw.-Mech., 
Bd. 14. 
Tennent, D. H. 1910 The dominance of maternal or of paternal characters in 
echinoderm hybrids. Archiv f. Entw.-Mech., Bd. 29. 
Vernon, H. M. 1895 The effect of environment on the development of echino- 
derm larvae. Phil. Trans. Royal Society of London. Series B., 
vol. 186, part 2. 
1898 The relations between the hybrid and parent forms of enchinoid 
larvae. Phil. Trans. Royal Society of London. Series B, vol. 190. 
1900 Cross-fertilization among echinoids. Archiv f. Entw.-Mech,, 
Bd. 9. 
GRAPllIC REPRESENTATION OF VARIATION 
For each of the Series I-V and for the combined Series I-V the classes and 
frequency of the right oral and the right anal lengths are shown by the method 
of rectangles. 
