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22 GASTEROPODHES. 
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largest Testacea. The Nautiline exists among its spawn. Possibly the 
Nautiline may belong to many of the Limacine species, and the univalve 
Testacea, as well as to the Doris. 
A few facts may be stated without attempting to solve the ob- 
securities. 
Spots of spawn are found on marine vegetables, such as the Lami- 
nari@ on the shore, within low-water mark. One, from an unknown 
parent, appeared in July, of small dimensions, and resembled a thick drop 
of yellow colour, almost hemispherical, with a depression in the centre. 
Possibly the true figure might have been a short bent cylinder, with the 
ends in contact, or nearly so, thus forming a circular ring —Plate XLVI. 
fig. 1. Such spots consist of numerous minute white ova. When dis- 
solving, on the Ist of August, a corresponding multitude of minute white 
specks, proving to be Nautilines, swam actively through the water ; while 
others remained motionless at the bottom.—Fig. 2. The drop little 
exceeded a line in diameter, and it may have been the spawn of some 
Doris or of a testaceous animal. 
Among the varieties of appearances disclosed by the spawn of the 
humbler animals of this tribe are the Nautilines, at rest or in motion. 
The specks, in an ovoidal mass of spawn, somewhat more ample than that 
from the Doris sanguifer, performed a revolution while confined within 
the capsule, as each was confined by its own integument. The cilia were 
quite visible while still enclosed there-—Fig. 3. When released from 
their prison by maturity, it was to display all the peculiarities of the 
Nautiline—Fig. 4. They rose in multitudes from below, and formed a 
scum on the surface of the water, from which they were incapable of de- 
scending until precipitated by the vessel being shaken. Did we know the 
sources of that which we consider spawn to have been derived, our inquiries 
would. be greatly facilitated ; we could seek for corroboration, or weigh 
the causes of disappomtment. Researches after marine products are so 
vague and difficult, and so often unsatisfactory, that all illustrations are 
most desirable. The two figures, 3 and 4, represent Nautilines from an 
ovoidal mass of spawn, from an unknown parent. In the former they 
are still confined, each within its own integument ; in the latter they are 
