. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. EHIZOMYS. 317 The scapula of and of JR. badius are essentially like that of Siphneus, and when they are described as only more elongated and broader across the neck of the bone than in ordinary rats, some idea of their form will have been conveyed. The acromio-scapular notch is not so deep as in the rat, and the acromion is more forwardly projected than in that animal an
. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. EHIZOMYS. 317 The scapula of and of JR. badius are essentially like that of Siphneus, and when they are described as only more elongated and broader across the neck of the bone than in ordinary rats, some idea of their form will have been conveyed. The acromio-scapular notch is not so deep as in the rat, and the acromion is more forwardly projected than in that animal and has great expansion. The OS innominatum conforms to the Arvicoline type, but the thyroid foramen is much longer than in Siphieiis, and the pubic and ischial bones are weaker and less expanded, the former being reduced to a narrow rod. There are also certain remarkable differences between the pelves of these two forms. In M. badius the thyroid foramen is quite as small as in Siphneus, and the symphysis pubis, which is rather deep in H. pruinosus, is the very opposite in the former species. In both, anchylosis has taken place through the intervention of a triangular epiphysis, but, even with the aid of this, the symphysis is not so deep as in Mus decumanus. The sexual characters of the pelves of these species are very well defined, the transverse breadth of the symphysis being much greater in the female than in the male. The skull has been described by Temminck, and its general characters indicated by A. , so that nothing remains to be said under this head, except that the periotic buUse are well developed on the posterior aspect of the skull, behind the auditory osseous tube. Three prominent transverse grooves occur on the anterior portion of the palate, immediately before the molars, and are succeeded by four much more obscure furrows between the teeth. In a young example of R. pruinosus, Blyth, the incisor teeth are well exposed, but none of the upper or under mola
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