OCR Text |
Show 1879.] MR. OTTLEY ON THE EYE-MUSCLES OF MAMMALS. 121 Sternum oval, pointed behind, and similar in colour to the cephalothorax. Ijegs pale dull yellowish, the femora being dark brown, and the tibiae, metatarsi, and tarsi marked with brown, giving them a somewhat annulated appearance; beneath the terminal claws is a small claw-tuft. The palpi are short, and of a more uniform pale-yellowish colour, clothed with, among others, some pale scale-like hairs above ; while the digital joints have numerous longer, blackish ones beneath. Abdomen short-oval, and of dark maroon-brown colour, thinly clothed with short, pale grey, or whitish, rather shining, somewhat squamose hairs; an indistinct pale stripe runs obliquely from just beneath each side of the fore extremity to, or towards, the spinners; the central longitudinal line is broadly blackish, but not very distinctly defined; and there are, on its hinder part, some very indistinct paler, sharply angular lines in a longitudinal series; on the underside is a broad, longitudinal, central blackish band, somewhat narrowing to the spinners. Hab. Blumenau, Sta. Catherina, Brazil. On the leaves of various herbaceous plants, in little three-entranced, white, silken nests. 4. O n the Attachment of the Eye-Muscles in M a m m a l s. - I . Quadrumana. By W . O T T L E Y , M.B., F.R.C.S., Demonstrator of Anatomy at University College, London. [Received January 1, 1879.] • During the last six months I have been enabled, by the kind permission of M r . Garrod, to examine the attachment of the eye-muscles to the sclerotic in a large number of the Mammalia. In some orders m y observations have been as yet too few to enable me to generalize from them; but in the Quadrumana, where there has been a larger amount of material at m y disposal, the variations in these muscles appear to be sufficiently well marked and characteristic to deserve a short record. As a preliminary, I may state that, from the observations of Profs. Donders, Helmholtz, and others, it has been established that in m an the six muscles are combined in the following manner : - In turning the eye up, the superior rectus and inferior oblique act; in turning it down, the inferior rectus and superior oblique; directly inwards, the internal rectus; directly outwards, the external rectus. In any intermediate position three muscles are used, thus:- In turning the eye up and in, the superior and internal recti and inferior oblique; in turning it up and out, the superior and external recti and the inferior oblique ; and so for the other movements. |