Neritina, freshwater, British.
In some cases all the eggs in a capsule develop; in other cases one egg only in a capsule (Neritina), or a small proportion (Purpura, Buccinum), advance in development; the rest are arrested either after the first process of cell-division (cleavage) or before that process.
60), at one time supposed to be the developing anus, but shown by Lankester to be identical with the " shell-gland " discovered by him in other Mollusca (Pisidium, Pleurobranchidium, Neritina, &c.).
- Nervous System of the Pond knob - like particle Snail, Limnaeus stagnalis, as a type of the (Neritina and Palu- short-looped euthyneurous condition.
The fresh-water snails which are not Pulmonates are the Paludinidae, Valvatidae and Ampullaridae, together with Neritina, a genus of the Neritidae.
Neritina has a very small spire, the terminal portion of the shell containing nearly the whole animal.
Post-Pliocene "Aral-Caspian deposits," containing the usual fossils (Hydrobia, Neritina, eight species of Cardium, two of Dreissena, three of Adacna and Lithoglyphus caspius), attain thicknesses varying from 105 ft.
On its shores are tortoises, mud-turtles, crayfish and innumerable sand-hoppers; and at varying depths in the lake several species of Melania, Melanopsis, Neritina, Corbicula and Unio have been found.
Mushketov [1850-1902 ]) Cardium edule, Dreissena polymorpha, Neritina liturata, Adacna vitrea, Hydrobia stagnalis, in the Kara-kum desert, and Lithoglyphus caspius, Hydrobia stagnalis, Anodonta ponderosa and the sponge Metchnikovia tuberculata, in the Kizilkum desert.
As examples of the former may be named- Archaeobdella, Clessinia variabilis, Neritina liturata, Gmelina, Gammarus moeoticus, Pseudocuma pectinate, Paramysis Baeri, Mesomysis Kowalevskyi and M.