292 GASTEROPODES. 
The other specimen, also consisting of a surprising quantity, and of 
much the same character, was deposited on the exterior of an old oyster- 
shell. It was little inferior in extent, and consisted of many convolu- 
tions, in more picturesque form, and formed a beautiful aggregate of 
frills——Plate XLIII. fig. 3. But I could not ascertain whether the parent. 
was the Doris argo or the Doris verrucosa, though some inclined to ascribe 
it to the latter. This beautiful specimen occurred likewise in the month 
of February. 
The margin of all this kind of spawn is thick, transparent, and dis- 
tinct ; nothing is lodged in it. The ova are contained amidst the albu- 
minous matter, lower in the ribband. 
In some parts of the former, the young were far advanced, when it 
resembled the texture of the finest lace.—Plate XLIII. fig. 4. 
More than one ovum had a place in the thickness of the spawn; all 
were arranged in lines and curvatures, but without any regularity there 
or in their dimensions. 
The contents of the ribband are sometimes very distinct.—Plate 
XLIIIT. figs. 5, 6. Also, where the young are seen in the ovum, it some- 
times appears to contain two. Yet this may be a deception, if a single 
embryo naturally belongs to the animal, as is probable ; for the separa- 
tion of the two integuments may be imperceptible. 
In the second deposit above mentioned (fig. 3.), as it advanced gra- 
dually to maturity, the Nautilines became more and more distinct. They 
were better seen than in any preceding spawn; and here was an instance 
of two in some, and three in others, occupying single ova. 
A portion of this being cut off with scissors, it was subjected to the 
microscope. A singular scene was disclosed. The most mature part 
consisted of perfectly transparent capsules, quite spherical, all apparently 
connected, because deposited amidst albuminous matter. The whole 
appeared merely white specks to the naked eye. 
A spherical integument evidently formed each capsule, including 
two or three Nautilines, which were in the greatest activity ; a few had 
only one, and a solitary capsule contained four. Their form was clearly 
defined ; their activity very great within, equally as after liberation. 
