Habits and structure of Cotylaspis insignis Leıpy. 935 
vessel, two branches from this one anterior and one posterior into 
which all the larger capillary vessels discharge, minute non-ciliated 
capillaries terminated by ciliated flame-cells. 
4. Concretionary structures are not found in any part of the 
excretory system. 
5. The cuticle at the body openings is infolded and as it passes 
to communicate with the epithelium of the organs presents 
transitions in position form and the degenerated condition of nuclei 
that indicate its origin in accordance with the opinion of MonTı- 
CELLI and others as a modified ectoderm in which the cells have 
fused and degenerated. 
6. There is a single testis, the oviduct resembles that of 
Aspidogaster near the ovary in having the same “tuba fallopii“ 
described by VoELZkow and STAFFORD, there is no distinct 
ootype or shell gland, no “Laurer canal”. The embryos are few 
and large, they are not developed in the uterus, but are discharged 
from the uterus before they have begun to segment. 
7. A young specimen found differs from the adult in having 
a simple ventral sucker, no eyes, no marginal organs, two entirely 
distinct excretory systems and wholly separate pores, in not having 
the reproductive system at all developed. 
> 
Hamline University, Saint Paul, Minnesota. 
July 11th, 1904. 
