THE ANNALS AND MAGAZINE OF NATURAL HlSTOliY. [SIXTH SERIES.] No. 72. DECEMBER 1893. LX. — A Contribution to the Morphology of the Limbs and Mouth-parts of Crustaceans and Insects. By Dr. H. J. Hansen, of Copenhagen *. It was chiefly in consequence of my work upon the Crustacea belonging to '' Dijmphna-Togtet's zoolog.-botan. UJbytte " of 1884-1885 that I was led to the study of the morphology of the skeleton of this class of animals. Since then I have more than once devoted some time to similar morphological studies of most of the orders of all four classes of the Arthro-poda, and it is my intention to publish a more extensive memoir dealing with a series of such questions in the case of the Insects, Myriopods, and Crustaceans. Many of the figures are already prepared ; other circumstances have, how-ever, induced me to resolve no longer to postpone a provi-sional publication of the greater portion of the most important of my results. I may be permitted to mention that the views to be detailed in tlie following pages have been developed in the course of eight years as a result of the periodical investigations to which I have alluded ; that I have been able to devote considerable time to repeated consideration, to the acquisition of a good supply of material, and to the practice of the necessary dis-section, which is often very difficult owing to the small size of the majority of the objects, in order to make myself familiar * Translated from the ' Zoologischer An!!eip:er,' xvi. Jahrg., no3. 420 and 421 (May 29 and June 12, 1SJ)3), pp. 193-198 and 201-212. Ann. & Mag. N. Hist. Ser. 6. l^ol. xii. 32
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