282 
XIX. THE SUPPOSED DESCEN 
Interrelationships and lines of descent as suggested by a number o 
noted on each scheme. * Denotes that the diagram is the present writ 
FISHES, LIVING AND FOSSIL 
hee a 
s Bite 
4 re 
x 
yy 
Br 
Towes (’91)* 
(On Urino Genital System) 
- 
Maeckel ('98)* 
(On Anatomy) 
W.N. Parker (’92)* 
(On General Anatomy) 
Ancestral Stem 
of Amphibians 
and Fishes 
Burckhardt (’92) 
(On Central Nervous System) 
ae —— Petromyzon 
Teleost 
Smith Woodward ('92)* 
(On Palaeontology) 
Retzius (°98) 
(Nervous System and End Organs) 
