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
Hyas coarctatus of the walking legs is often more or less furry. "H. coarctatus" is found at both hard, stony, sandy and soft bottoms from 1 to 500 meters depth, though most often above 50 meters. "H. araneus" inhabits shallower depths. "H. coarctatus" is widely distributed in the North-East Atlantic and adjacent seas. The northern border is around the north and west coas5w of Spitsbergen and Barents Sea, in the south it is found down to the north-east coast of France, and in the east to the Western Baltic Sea, the Belt Sea and the Öresund. Hyas coarctatus Hyas coarctatus is a