August Johann Rösel von Rosenhof the fathers of German entomology. The fourth part is practically a monograph of the spider Araneus diadematus. The description of the animal is illustrated by six plates which show the differences in variation of the colouring of the species. They show also internal dissections. Rosenhof was interested in the production of silk but he confused the anus with the opening of silk-producing glands. He published, between 1753 and 1758, "Historia naturalis Ranarum nostratium" devoted to frogs. The quality of the work, in particular of its illustrations, make it one of the most beautiful devoted to these animals. He presented the
European nightcrawler and are pale yellow at first, becoming more brownish as the worms inside become mature. These cocoons are clearly visible to the naked eye. European nightcrawler The European nightcrawler, Eisenia hortensis or "Dendrobaena veneta", is a medium-small earthworm averaging about 1.5 grams each when fully grown. Generally blueish, pink-grey (cf. Latin "veneta" meaning "sea-blue") in color with a banded or striped appearance, the tips of their tails are often cream or pale yellow. When the species has not been feeding, it is pale pink. These worms are usually found in deep woodland litter and garden soils that are rich in