364 Mr. H. J. Carter on Spongilla. 
had occasionally the two remarkable [ear-like] processes 
better seen in no. 3 [Pl. XVI. fig. 8, c, where both “a” and 
“2%” are figured together]. ‘This’ form [viz. with the ear-like 
processes] I have so often seen that, if it is not constant, it is 
very frequent.” Hence at that early period I had not only 
noticed the ‘ ear-like processes,” which were subsequently 
identified with the “ profile” outlines of the “collar,” but the 
cilium of the same form of sponge-cell which I afterwards 
found to take in particles of food (indigo), and finally called 
‘¢ spongozoon,”’ in connexion with a much smaller spherical 
cell that in the previous -year, viz. 1854 (‘ Annals,’ vol. xiv. 
p. 334, pl. xi. figs. 1-6), I had taken for the zoosperm of 
Spongilla; and although some little time afterwards I thought 
otherwise, still I now see, from its comparative smallness and 
the subsequent representations of others, that I was probably 
right in my original conjecture. Fortunately figures were 
published in the ‘ Annals’ about the same time these facts 
were noticed ; and therefore what has just been stated cannot 
be considered a mere afterthought of the present day. 
Lastly, I have to allude to a figure in my “ journal ” on 
the 29th March, 1857, which I have always regretted that I 
did not represent with the description of the “ isolated ovi- 
bearing sponge-cell”’ in the ‘‘ Ultimate Structure of Spongilla” 
(‘ Annals,’ July 1857, vol. xx. p. 26), and which in the course 
of development becomes the ampullaceous sac *, since, besides 
being isolated in the watch-glass wherein a young Spongilla 
after having been fed with carmine had been torn to pieces, it 
may present a vibratory movement of the cilia inside, while 
the continuity of its capsule outside is indicated by its having 
refused throughout to admit any of the colouring-matter 
(Pl. XVI. fig. 7); thus, mstead.of the ampullaceous sac, 
it now appears to me to have resembled the “‘ Spermaballen ” 
first pointed out in Spongilla by Lieberkiihn in 1856 (op. ett. 
Heft v. Taf. xviii. fig. 10), then by F. E. Schulze in Hali- 
sarca lobularts in 1877 (Zeitschrift f. wiss. Zool. Bd. xxviii. 
Taf. iii. fig. 18), and lately by Metschnikoff in 1879, in Halv- 
sarca Dujardin (ib. Bd. xxxii. Taf. xx. fig. 2). The sub- 
joined note in my “journal” on the last occasion that I saw 
this cell is dated 31st March, 1859, and runs as follows :— 
‘In the last examination an isolated sponge-cell was seen 
* The so-called “ ovi-bearing sponge-cells” in this paper are the spheri- 
cal cells of the statoblast, which contain the germs (formerly viewed by 
myself as ova, and hence the appellation). On the contents of the stato- 
blast issuing under germination, these “spherical cells” and their contained 
germs appear bodily to become the ampullaceous sacs in the young Spon- 
gula, and, in some if not in all instances, to end in becoming respectively 
developed into new statoblasts. 
