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Show 24 MR. F. E. BEDDARD ON THE [May 2, I found it impossible to subdivide tlie Adductor mass. The Semimembranosus is divided into two muscles fox' some way in front of its obviously double insertion on to the tibia and the femur. I could not find, however, that this muscle was divided at its origin from the ischium. The Semitendinosus, as in some other, but not in all, Mustelida3, has a very distinct caudal head. There is no Agitator caudaz. The Tenuissimus is plainly present. The Tibialis anticus is single. § Lungs. As Prof. Garrod pointed out in H. subaurantiaca, the lungs in If. personata consist of four lobes on the right side and two or. the left. Prof. Garrod, however, made no observations upon the relative sizes of the several lobes. On the right side the first lobe is rather larger than the second ; the third is the biggest of all and quite twice the size of the first; the fourth or azygos lobe is the smallest of all. The two lobes on the left side are more nearly equal in size, but the second or lower lobe is the larger. § Liver. The liver of this species appears to be much like that of H. subaurantiaca. The enormous right central lobe is deeply* fissured and exposes the gall-bladder on the diaphragmatic side. This lobe is quite twice the size of the left lateral lobe, which is the next largest; this lobe again is larger than the right lateral, which does not s I i o a v any great difference of size from either the left central or the caudate. The Spigelian lobe is minute. § Pancreas. The pancreas of Helictis is almost exactly like that of the Tayra (Galictis), with which Arctoid I have specially compared it. It is not clear from Garrod's description what is the precise form of the gland in the species investigated by himself. In H. personata there is a circular portion of the pancreas running right round the duodenal loop t ; this ends in a straight piece running parallel with the spleen. The chief difference which Helictis shows from Galictis is in the mesenterial attachment of the straight part of the pancreas. In Galictis a transparent mesentery, apparently anangious, is attached to the whole length of the straight region of the pancreas, and is inserted 011 to the mesocolon along a line which commences in front of and ends behind the left kidney. * But not quite so deep]}' as in Galictis. f As in many Carnivora, cf. e.g. Owen's Comp. Anat. vol. iii. p. 496. |