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Show 1875.] MR. A. H. GARROD ON HALMATURUS LUCTUOSUS. 57 form of a formula. Employing the divisions, so evidently natural, proposed by Prof. Flower, I commence by writing down the name of the largest lobe, after which the others in the order of their bulk, with symbols between each to indicate their relative size. Taking the liver-formula of Dorcopsis luctuosa as an example, it may be thus written, L.L. 2>C. |>R.C. i>Sp.>R.L. 2>L.C; and it reads as follows :-The left lateral lobe (L.L.) is the largest; it is twice the size of the caudate ( C ) , which is half as large again as the right central (R.C.), which is half as large again as the Spigelian (Sp.), which is larger (very little) than the right lateral (R.L.), which is twice the size of the left central (L.C.). The similarly constructed formula of Macropus melanops is L.L. = C. 2>R.C. |>R.L. £>Sp. 3>L.C, and of Halmaturus derbianus L.L. If >C=R.C. |>Sp. i>R.L. 2>L.C.: they show hew great a similarity there is between the different members of the family Macropidce. The gall-bladder is situated in the deep cystic fossa; and the umbilical fissure is not deep. The Spigelian lobe has its apex directed vertebrally and resting on the left lateral lobe, as in Macropus; no secondary lobules are connected with it. There is a peculiarity in the liver of the specimen of Dorcopsis luctuosa under consideration, which may be individual, or it may be characteristic of the species, genus, or subfamily; at all events, I have not seen it in any other mammalian animal. Looking at the diaphragmatic surface of any multilobate liver, the lateral margins of the mass formed by the right and left central lobes are always seen to overlap, to a greater or less extent, the lateral lobes in an imbricate manner. Similarly the right lateral lobe overlaps or covers the caudate. In the livers of Macropus and Halmaturus which I have by me, this conformation is strictly maintained. But in Dorcopsis luctuosa the caudate lobe overlaps the right lateral lobe (instead of being situated on its abdominal surface), in such a way that the last-named lobe is only seen between the right free edge of the right central lobe and the left free edge of the caudate. This condition is not brought about by any post mortem change in the position of the lobes, because the right lateral fissure is not so deep as to separate them at their vertebral extremity. The uterus is perfectly Macropine, as are the vaginae. No direct communication could be found between the uterine pouch of the vaginae and the common vaginal canal. A gland, as usual, about the size of an almond, with a slender duct, opens on each side of the narrow cavity included between the sphincter ani and the external common sphincter. In conclusion, the comparison of the various organs and structures |
