Miscellaneous. 207 
We have had two specimens of this variety in the British Museum 
since 1859; and more lately, Mr. Jamrach has sent me five or six 
specimens, of different sizes, to examine, which he had received from 
North Australia. Some of the specimens are larger and rather more 
ventricose than any of the typical form that I have seen. The two 
specimens of this variety in the Museum have the suture rather im- 
pressed ; but I believe this is only an accidental circumstance. 
3. A. T. Broderipi. The shell solid, and like No. 1; but the 
streaks are very narrow, linear, and more or less acutely sinuated, 
sometimes anastomosing and forming a network. 
There are two specimens of this variety in the Museum—one from 
Mr. Broderip’s collection. 
4. 4. T. Damonii. Shell with close angular intersecting lines, 
forming crowded triangular spots on the surface ; the sutural callo- 
sity very dark. 
~ This shell, which was sent to the British Museum by Mr. Damon, 
is marked much like Oliva terturata. It differs from Amoria 
reticulata, with which it has been confounded, in the shell being less 
ventricose. 
5. A. T. Cumingii. Like the former; but the netted lines are 
much firmer, and there are two spiral series of small irregular spots. 
A small specimen in the British Museum collection, the most 
beautiful variety of the series, received, in 1859, with 4. 7. Jamrachii, 
as Voluta pertusa. 
6. Ad. T. maculata. Shell pale brown, with two spiral series of 
iarge squarish dark spots, and a series of large irregular spots near 
the suture. (Voluta maculata, Swainson, Zool. Illust. t. — -) 
7. A. T. pallida, Shell pale brown, nearly uniform in colour, but 
sometimes marked with more or less distinct brown spiral bands, or 
with transverse stripes or very obscure netted lines. (Voluta pallida, 
Gray.) 
I am aware that some conchologists may be inclined to regard 
these varieties as species, though I have seen specimens which seem 
to unite all of them into one series: I have therefore chosen for 
them names by which they may be so designated. 
On the Motory Phenomena of the Sponges. 
By N. Lirserkinn. 
Of the movements hitherto observed in Sponges, some are con- 
cerned with portions of the skin and efferent tubes, and others with 
isolated cells. 
During the contraction of the efferent tubes, the wall of these 
organs becomes thickened by shortening, and its surface becomes 
mamillated, allowing us to recognize the limits of cells which were 
previously indistinct. The movements of the integument consist in 
an approximation or separation of the parenchyma of the body, and 
also in the opening and closing of the pores of ingestion. The iso- 
lated cells are capable of changing their form, so as to present, for 
example, alternately a spherical and a stellate appearance. Hitherto 
no one has observed any displacement of cells ; but movements of this 
