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Show 1881.] MR. BARTLETT ON THE HABITS OF THE DARTER. 247 rP Dimensions. millim. Total length (the tip of the tail is broken off) 310 From tip of snout to ear-opening 43 ,, ,, „ fore limb 53 „ ,, ,, vent 135 Length of fore limb 72 »» >» third finder 17 •a „ „ fourth finger 19 „ hind limb 95 „ third toe 19 „ fourth toe 28 >5 », This species is allied to E. heterolepis, E. microlepis, and E. pra?- stabilis, but differs from all three in the higher dorsal crest, from E. heterolepis in the scales of the body, which are smaller (about 42 vertically in the present species, and 29 in E. heterolepis) and not intermixed with conical ones, and in the absence of a second lateral series of large scales; from E. microlepis in the larger, slightly or not keeled dorsal scales ; from E. pra?stabilis in the shape of the dorsal scales, and especially in the strongly keeled pectoral and ventral ones. EXPLANATION OF PLATE XXVI. Fig. 1, Enyalius oshauyhnessyi. 1 a, scutellation of the side of ditto. Fig. 2. Scutellation of the side of E. microlepis. 6. Remarks Jupon the Habits of the Darter {Plotus an-hingd). By A. D. B A R T L E T T , Superintendent of the Society's Gardens. [Eeceived Jan. 6, 1881.] At a meeting of this Society in 1869 (see P.Z.S. 1869, p. 142) I read a paper upon the habits of the Hornbills, and called attention to the fact that, from time to time, these birds cast up a substance that is found upon examination to be the epithelial lining of the gizzard. I now bring before the Society a notice of another instance of this remarkable habit, in a very different group of birds. A Darter {Plotus anhinga), the bird I now speak of, was received on the 18th of July 1880, and since that time has appeared to be in perfect health, and has fed regularly. It has thrown up the lining of its stomach on three or four occasions during this period; but unfortunately the keeper, not being aware of the interest that would be attached to the circumstance, and not knowing the nature of the substance, carelessly threw the castings away. I happened, however, to be present when the last sac was thrown up, and secured it for examination, and have handed it over to our Prosector, M r . Forbes, for that purpose, This remarbable fact being now known to occur in two widely |