On the other hand, I must remark that horizontal sections of the scutes have presented oblique parallel fissures, sometimes crossing one another, which might readily be supposed to correspond with the lines of separation of ossified bundles of connective tissue. * * * * * NOTE.--During a recent visit to Paris, my friend Mr. Busk was kind enough to examine the specimens of recent _Crocodilia_ in the Museum of the Jardin des Plantes, with reference to certain points to which I requested his attention. Mr. Busk informs me that there is no doubt about the transverse direction of the premaxillo-maxillary suture in _Crocodilus rhombifer_; and his statements lead me to entertain no question that _C. bombifrons_ is a synonym of _C. palustris_. In the typical specimens of _C. marginatus_ and _C. suchus_ of Geoffroy St.-Hilaire, the premaxillo-maxillary suture extends back to the level of the seventh tooth. Mr. Busk has furthermore pointed out to me the existence of another American species of Crocodile--_C. Morelettii_, which has been described by M. Auguste Duméril in his "Description des Reptiles nouveaux ou imparfaitement connus," &c., 'Archives du Muséum,' t. vi. 1852. This species inhabits lake Flores, in Yucatan; and it is said by M. Duméril to approach _C. Americanus_, from which it differs in the proportions of the skull and in the characters of the dermal armour. June 21st, 1859. * * * * * On the Habits of the "Aye-Aye" (_Cheiromys madagascariensis_, L., Cuv.). By the Hon. H. SANDWITH, M.D., C.B., Colonial Secretary of the Mauritius. Communicated by Prof. OWEN, F.R.S., V.P.L.S. [Read April 7th, 1859.] "Mauritius, Jan. 27, 1859. "MY DEAR MR. OWEN,--After very great difficulty and much delay, I have at length obtained a fine healthy male adult _Aye-Aye_; and he is now enjoying himself in a large cage which I have had constructed for him. He is a most interesting little animal; and from close observation I have learnt his habits very correctly. On receiving him from Madagascar, I was told that he ate bananas; so of course I fed him on them, but tried him with other fruit. I found he liked dates,--which was a grand discovery, supposing he be sent alive to England. Still I thought that those strong rodent teeth, as large as those of a young Beaver, must have been intended for some other purpose than that of trying to eat his way out of a cage--the only use he seemed to make of them, besides masticating soft fruits. Moreover, he had other peculiarities,--_e.g._, singularly large, naked ears directed forward, as if for offensive rather than defensive purposes; then, again, the second finger of the hands is unlike anything but a monster supernumerary member, it being slender and long, half the thickness of the other fingers, and resembling a piece of bent wire. Excepting the head and this finger, he closely resembles a Lemur.