JOURNAL OF THE PROCEEDINGS OF THE LINNEAN SOCIETY. ZOOLOGY. VOL. IV. LONDON: LONGMAN, GREEN, LONGMANS AND ROBERTS, AND WILLIAMS AND NORGATE. 1860. PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. LIST OF PAPERS. Page GARNER, ROBERT, Esq., F.L.S. On the Shell-bearing Mollusca, particularly with regard to Structure and Form 35 HANLEY, SYLVANUS, Esq., F.L.S. On the Linnean Manuscript of the 'Museum Ulricæ' 43 HUXLEY, Prof. T. H., F.R.S., F.L.S., F.G.S., Professor of Natural History, Government School of Mines. On the Dermal Armour of _Jacare_ and _Caiman_, with Notes on the Specific and Generic Characters of recent _Crocodilia_ 1 SALTER, S. J. A., Esq., M.B., F.L.S., F.G.S. On the Moulting of the Common Lobster (_Homarus vulgaris_) and Shore Crab (_Carcinus mænas_) 30 SANDWITH, Hon. H., M.D., C.B., Colonial Secretary of the Mauritius. On the Habits of the "Aye-Aye" (_Cheiromys madagascariensis_, L., Cuv.) 28 WALKER, FRANCIS, Esq., F.L.S. Catalogue of the Dipterous Insects collected at Makessar, in Celebes, by Mr. A. R. Wallace, with Descriptions of New Species 90 WALLACE, A. R., Esq. On the Zoological Geography of the Malay Archipelago 172 INDEX 185 JOURNAL OF THE PROCEEDINGS OF THE LINNEAN SOCIETY OF LONDON. On the dermal armour of _Jacare_ and _Caiman_, with notes on the Specific and Generic Characters of recent _Crocodilia_. By T. H. HUXLEY, Esq., F.R.S., F.L.S., Prof. of Nat. History, Gov. School of Mines. [Read Feb. 17th, 1859.] In the course of a recent investigation into the nature of the singular extinct reptile, _Stagonolepis_, I was led to inquire somewhat minutely into the character of the exoskeleton, or dermal armour, of the existing _Crocodilia_. To my surprise, I found that very little detailed information on the subject was to be obtained from the standard repertories of Comparative Anatomy, or even from the special monographs on Crocodilian structure and classification; but I was still more astonished to discover, among whole genera of recent _Crocodilia_, an exoskeleton possessed of characters such as have been universally supposed to be peculiar to long extinct forms of the order, and whose existence in any recent species has hitherto, so far as I can ascertain, been completely overlooked.