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Updated: June 1, 2025
The caddis-worms kill the ova by making a small hole in them and sucking some of the contents out; from this hole some more of the contents escapes, and as it comes into contact with the water becomes opaque. Caddis-worms are the larvæ of an order of four-winged flies commonly known as sedges, caddis-flies, or water-moths.
Fishes, kidneys of, represented by Corpora Wolffiana in the human embryo; male, hatching ova in their mouths; receptacles for ova possessed by; relative size of the sexes in; fresh-water, of the tropics; protective resemblances in; change of colour in; nest-building; spawning of; sounds produced by; continued growth of. Flamingo, age of mature plumage.
The bulk of the entire organ consists of connective tissue, in which lie imbedded the Graafian follicles or ovisacs, in which the ova are contained. These follicles or ovisacs are minute cells which are packed immediately beneath the surface, where they occur in all stages of development.
Lyons says that it is one of the most loathsome diseases that comes under the observation of medical men. He describes the disease as "essentially a scrofulous inflammation of the Schneiderian membrane, ... which finally attacks the bones." Flies deposit their ova in the nasal discharges, and from their infection maggots eventually arise.
While it is probable that a variable number of the immature ova undergo partial development before puberty, yet the advent of sexual maturity at that time marks the establishment of the regular development of the Graafian follicles and their contained ova, accompanied by the attendant phenomena of menstruation.
On the other hand, he could not afford to come to Hobart Town from England at his own expense, as he has not the means. Would the colony, if other attempts failed, be willing to pay Birch's passage out and home if he failed also, and would he receive the L500 if he succeeded? By success I mean that he would either bring live fish or ova that would hatch into live fish.
In order of time, fish would naturally come later than the lower invertebrata; both as being less likely to have their ova transported across the waste of waters, and as requiring for their subsistence a pre-existing Fauna of some development. They might be expected to make their appearance along with the predaceous crustaceans; as they do in the uppermost Silurian rocks.
Instead of saying that the zygote composed of ovum and spermatozoon is incapable of giving rise in the male to ova, or in the female to sperms, we should hold that the gametocytes ultimately give rise to ova or to sperms according to the metabolic processes set up and maintained in them through their successive cell-divisions under the influence of the double or single X chromosome.
"It is worthy of remark that in the month of May a very great number of large larvae exist under the mucous membrane at the root of the tongue and posterior part of the nares and pharynx. The Indians consider them to belong to the same species with the oestrus that deposits its ova under the skin: to us the larvae of the former appeared more flattened than those of the latter.
Other birds, usually found on or near the water, are also likely to do much harm to the ova and young fish. Almost every creature which is found near the water seems to have a great liking for the ova of fishes. All the wading and swimming birds are to be dreaded by the fish culturist. They will, all of them, eat ova in enormous quantities, and many of them will also eat the little fish.
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