54. STRETHILL WRIGHT, ON THE EOLID®. 
was brought home from Morison’s Haven, on a shell covered 
with Hydractinia, taken from a rock-pool, in which was a 
profuse growth of Campanularia Johnstoni. The papille of 
this Eolis contained the two kinds of thread-cells which are 
found on Hydractinia, together with the large thread-cells 
which occur within the reproductive capsules of C. Johnstoni. 
2nd. An Eolis coronata was taken at Queensferry, on a 
massive specimen of Coryne eximia, which was very 
abundant there. The thread-cells of C. eximia were very 
distinctive, being very large, oval, and containing a four- 
barbed dart. The thread-cells of the Eolis and Coryne were 
carefully compared together, and were found to be identical. 
3rd. Dr. M‘Bain and Dr. Wright found an Eolis Drummondii 
on a fine specimen of Tubularia indivisa. They first carefully 
examined the thread-cells of the Tubularia, and found four 
kinds, two (large and small) of a nearly globular shape, each 
containing a four-barbed dart, and two (large and small) of 
an almond shape, the larger one containing a thread fur- 
nished with a lengthened brush of recurved barbs. They 
then examined the papille of the Eolis, and found the ovate 
sacs filled with an indiscriminate mixture of all the four kinds 
of thread-cells found on Zubularia indivisa. 4th. Dr. M‘Bain 
and Dr. Wright found aspecimen of Kolis Landsburgii on 
Eudendrium rameum. Eudendrium rameum was furnished, as 
to the bodies of its polyps, with very large, bean-shaped thread- 
cells, in which an unbarbed style could be detected, while the 
_tentacles of the polyps were covered with exceedingly minute 
cells. They compared the thread-cells of the Eudendrium 
with those found in the sac of Eolis, and found both kinds 
identical. Lastly, Dr. Wright had kept the specimen of 
Eolis Drummondii above mentioned fasting for a long time, 
aud then introduced it to a large specimen of Coryne 
eximia fresh from the sea. The next morning every polyp 
of the zoophyte had vanished, and the ovate sacs of the Eolis 
were packed with the distinctive thread-cells of the Coryne, 
mixed with a few thread-cells of 7. indivisa, the remains of 
its former feast. He also found the thread-cells of C. ex- 
imia in the alimentary canal. It was at one time supposed 
that thread-cells, or Cnidz as Mr. Gosse had named them, 
were only to be found in the Hydroid and Helianthoid polyps 
and the Medusz ; Professor Allman afterwards discovered them 
in a species of Loxodes, a protozoan animalcule ; and Dr. 
Wright had the good fortune to find them on the tentacles of 
an Annelid, Spio seticornis, and also on the tentacles of 
Cydippe, one of the Ctenophora. Since then he had observed 
them on the very minute tentacles of Alcinde, another of the 
