SO long ago as 1893, Dr. H. J. Hansen published in the Zoologischer Anzeiger a preliminary paper on the morphology of the limbs and mouth-parts in crustaceans and insects. Many of the views adumbrated ...

IN NATURE (vol. xvii. p. 284) is a notice of a work by Dr. Palmen, of Helsingfors, on the morphology of the tracheal system. From the wording of the notice it appears as if the views of Dr. Palmen as ...

Germano Leão Demolin Leite, Ronnie Von dos Santos Veloso, José Cola Zanuncio, Jatnel Alonso, Paulo Sérgio Fiuza Ferreira, Chrystian Iezid Maia Almeida, Geraldo Wilson Fernandes, José Eduardo Serrão ...

All insects belong to the phylum Arthropoda. But unlike other arthropods—like lobsters, spiders, or millipedes—insects have three pairs of jointed legs, segmented bodies, an exoskeleton, one pair of ...

Transactions of the Kansas Academy of Science (1903-), Vol. 103, No. 1/2 (Apr., 2000), pp. 76-94 (19 pages) Pennsylvanian strata of Kansas have yielded two species of xiphosurids (horseshoe crabs).