ZOD 
Pr BIOLOGICAL JOURNAL. 
Pei IL: OCTOBER, 1802. No. 3. 
BALANOGLOSSUS AS ONE OF THE GENERALIZED 
TYPES IN ZOOLOGY.* 
With Plate xxii. 
BY WILLIAM E. RITTER. 
‘During the summer of 1890, it was my good fortune to be able 
to spend the vacation studying in Alexander Agassiz’s Marin 
Laboratory at Newport, R. I. While there I became greatly in. 
erested in Balanoglossus and its larva, and collected considerable 
material for its study, and the original drawings here presented 
vere made at that time. a 
I take this opportunity to call the attention of our Pacific Coast 
zoologists to this remarkable animal more particularly than the zo- 
ogical text-books and the special papers treating of it would b 
ely to do, the desire being to hasten the bringing of the « creatu ; 
ight if it exist on these shores. At the same time, however, | 
1 add a few observations and reflections of my own, that may n 
e altogether without interest to those who have made a detailed 
tudy of the animal. Since Kowalevski! published the results | 
is investigations on the development of the simple Ascidians 
866, and there pointed out their relationship to the Vertebrates, 
no animal has been brought into court that has given such weighty 
estimony against the reality of a definite and hard fixed line sepz 
ng Vertebrates from Invertebrates, such as was supposed b 
zoologists, as has this same wormlike Balanoglossus. 
redit as seid first ih goes the true enatute of the an 
