| OCR Text |
Show 1882.] ANATOMY OF ERETHIZON DORSATUS. 279 central is larger than the left lateral; and that the Spigelian lobe larger both relatively and absolutely, and is also distinctly notched ; and that the caudate lobe is larger and more slender. H o w far these m a y be individual peculiarities I a m of course unable to say. The spleen was very different in form from that of Hystrix javanica. In the latter it is much elongated, while in Erethizon it is oval in shape and somewhat flattened. Its length is 3"*3, its breadth 2". The lungs consist of three lobes on the right side and two on the left, whereof the upper left lobe is divided by two deep notches. Fig. 8. The brachial plexus of Erethizon dorsatus. I-VII, cervical vertebra?; 1, 2, 3, 4, the first four ribs; cir, circumflex nerve ; Ex. cut, external cutaneous; In.c, internal cutaneous ; M, median, M.sp musculo-spiral; Cl, ulnar. The heart is very rounded at its apex. The aorta gives off a large innominate artery, from which the right subclavian and the two common carotids arise. The left subclavian is given off separately. |
