Kowalevsky or a bug is invaginated into the yolk at the head end, the portion of (1871 and 1887) on the embryology of the water-beetle Hydrophilus the blastoderm necessarily pushed in with it forming the amnion.
Stated that in the Muscidae, while the anterior endoderm-rudiment The embryo is invaginated into the yolk, but the surface edges of arises as Kowalevsky had observed, the posterior part of the " midthe blastoderm do not close over, so that a groove or pore puts gut " has its origin as a direct outgrowth from the proctodaeum.
In interpretations of Kowalevsky and Heider, and so on the whole do Orthoptera and Thysanura, as well as some others of the lower those of F.
In 1865 Kowalevsky discovered that the organs of respiration consist of numerous pairs of gill-slits leading from the digestive canal through the thickness of the body-wall to the exterior.
Fine examples of the spirit of the period as applied to extinct Mammalia are Gaudry's Animaux fossiles et geologie de l'Attique (1862) on the Upper Miocene fauna of Pikermi near Athens, and the remarkable memoirs of Vladimir Onufrievich Kowalevsky (1842-1883), published in 1873.
More or less independently, Huxley, Kowalevsky and Cope restored the stem ancestor of the hoofed animals, or ungulates, a restoration which has been nearly fulfilled by the discovery, in 1873, of the generalized type Phenacodus of northern Wyoming.
Great waves of extinction have followed the long periods of the slow evolution of relatively inadaptive types of tooth and foot structure, as first demonstrated by Waldemar Kowalevsky; thus mammals are repeatedly observed in a cul-de-sac of structure from which there is no escape in an adaptive direction.
The fauna of this sea has been studied by Eichwald, Kowalevsky, Grimm, Dybowski, Kessler and Sars.