GENERATIVE ORGANS OF SOME CARTILAGINOUS FISHES. 493 
large egg. Its membranes had been broken; but from what remained, it might 
be inferred to be of its full, or nearly full size, and ready, or nearly so, to be de- 
tached, and to pass into the infundibulum. Many small ova were contained in 
the ovaries. Both embryos were very small, with short branchial filaments. 
Some small tortuous vessels, conveying fluid blood, were seen on the inner surface 
of the uterine cavities. 
On the 13th September another specimen was obtained. In each uterine 
cavity were two ova, with an embryo attached to each. One egg weighed 44 oz. 
and 40 grs.; the embryo 28 grs. An egg from the other cavity weighed 4 oz. 
5drs.; the embryo 26 grs.: the other egg 43 oz. 40 grs.; its embryo 30 ers. This 
embryo was 2} inches in length. Its branchize were beginning to be covered; its 
branchial filaments were red, and very short. No yolk-substance was found in 
its intestine. 
On the 30th September, a specimen then procured contained an unusual 
number of ova, four in one cavity, three in the other. The eggs weighed, with 
their embryos attached, and the latter, after their separation, gave the following 
results :— 
Eggs and Embryo. Embryo. 
Oz. ~~ Dr. Dr. Gr. 
1 3 5 1 46 
2 3 5 1 57 
3 BE RNGe Tt OMG 
4 pdb lay ew 7 
1 dio a6k Pride 
2 3 34 1 50 
3 3 6 1 55 
Four of the embryos were females, three were males. In most of them the 
branchize were no longer naked, and the branchial filaments had disappeared. 
Put into fresh water, some of them showed signs of life—a movement of their 
gills was perceived. The internal yolk-membrane was stronger than that of any 
of the preceding at an earlier stage, allowing the egg to be lifted without break- 
ing, the thickness increasing towards the end. The internal membrane was 
beautifully vascular. There appeared to be two orders of vessels, their branches 
anastomosing, one conveying a brighter blood than the other; the vessels convey- 
ing the former smaller than those conveying the latter. The intestine of two 
embryos was examined; a little greenish matter, but no yolk, was found in it; 
yet, using the blowpipe, air passed pretty freely into it through the vitello-intes- 
tinal canal. The gills were similar to the preceding. The brain was distinctly 
formed; the kidneys were comparatively large; all the fins were distinct. The 
quantity of fluid in the uterine cavity was considerable. 
In a specimen procured on the 2d November, an embryo was found in each 
uterine cavity. The ovum of one was broken ; the other, which was entire, 
