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Show 676 PROF. G. B. HOWES ON THE PECTORAL [Dec. 2, (also synovial) upon the excavated anterior border of the mesopterygium (ms.). The posterior plate (np.) is, for the most part, in well-defined articulation, by means of an efficient synovial capsule, with the postero-lateral moiety (" glenoid commissure " of Parker x) of the All natural size. References.-g.s., shoulder-girdle ; ms., mesopterygium; mt., metapterygium ; np., neopterygium ; pp. propterygium. The black areas denote synovial cavities. 1 Bay Soc. Monograph on Shoulder-girdle and Sternum, p. 8. 2 I have found from experience that sections, such as those here figured give more satisfactory results than do mere macerated preparations. In "the latter, as in ordinary directions, the presence of occasional superficial furrows, at the points of fusion of rajs or segments or of the disposition of nerves, tendons, &c, and the appearances produced by the remains or cut ed°-es of inter-muscular septa, are apt to be seriously misleading. Haswell speaks (Proc. Linn. Soc. N. S. W . vol. ix. part. i. p. 35) of the propterygium of Trygon pastinaca as having in articulation with its distal extremity "a stout ray with which are connected a number of fin - rays" Gegenbaur makes no mention of this, and, as I have looked for it carefully but in vain m the five individuals of the species which I have dissected, I think it probable that Haswell m a y have been misled in the manner indicated, or that his " stout ray was but a fusion of rays such as m a y occur at any point in any fin. |
