tian capsule, it falls into the lower or oviduct portion of the sac, 
238 -. Composition of Begs. 
rosea; 17th, Syringa fragrans; 2lst Locust tree; 25th, Karly 
strawberry ripe; 27th, Autwerp raspberry in bloom; 28th, Bulb- 
ous Tris; 30th, Syringa Philadelphica; 31st, Roses generally in 
bloom. 
June 29th, Catalpa in bloom. 
Art. XXV.— On the Composition of Eggs in the animal series ; 
by A. Vavencrennes and F'rimy.—Parrt II.* 
WE referred in our first article, to the observations made pre- 
viously on birds’ eggs. Taking these eggs for criterions, we 
exhibited the results of our researches on those of cartilaginous 
fishes of the family of Squalide (Sharks,) and of those of the 
Raiidz (Rays). We remarked that the white shows hardly any 
traces of albumen, and that the yellow contains a substance insol- 
uble in water, suspended in the liquid in small tables, of forms 
varying according to the species; we explained its characteristics 
and its composition, and we called it Ichthin. We continue the 
explanation of our researches on the eggs of animals, completing 
what we have to say of other kinds of fish. 
Of the Eggs of the Csseous Fishes. 
The larger number of osseous fishes are oviparous. The ovary 
and the oviduct are in one large common sac, rounded toward 
the top, narrowed toward the bottom, and enveloped in a fold of 
the peritoneum, which the anatomist can separate from the real 
membrane of the passage of the ovario-oviduct, these two oblong 
pockets are reunited a little before their exit, behind the rectum. 
h organ is suspended above from the intestines by a ligament- 
ary fold of the peritoneum. The lower portion of the abdoml- 
nal region of this sac is smooth and without any fold of the mem- 
brane. On the upper or dorsal part, there are numerous scales, 
or lobes on which there are developed, in their own capsules, the 
thousands of ovulz afterwards to be laid. These ovarian folds 
are divided and subdivided into secondary, tertiary, and quater 
nary lobes of forms differing with the species. They float 10 
tufts and bunches, and in developing themselves, become those 
familiarly known masses of eggs. When the ovula is ripe, (to 
ake use of the technical word,) it detaches itself from its ova 
* From the Journal de Pharmacie, é&c., June, 1854, p. 415. 
