THE NEMATOCYSTS OF EOLIDS 
119 
The morphology of the cerata is so thoroughly understood, 
that there is no need to add anything to the writings of Daven- 
port C93), Hecht ('96), or Krenibzow ('02). The origin of the 
nematocysts, however, is still a subject for debate since many 
Fig. 2 Diagrammatic median longitudinal section through ceras showing com- 
plete cnidophoral system. CNDP., cnidopore; ECT., ectoderm; MUSC, long- 
itudinal and circular muscles; SPH., sphincter. 
biologists remain incredulous despite the published evidence. 
Grosvenor ('03) pointed out that this was the attitude assumed 
by some authorities toward T. Strethill Wright, who in 1858 
read, before the Royal Physical Society of Edinburgh, a paper in 
which he attempted to show that the nematocysts of eolids are 
