. Ibis . unchanged, and the same may be said of thept. spinalis, pt. humeralis *, pt. femoralis, and pt. pt. colli lateralis is as distinct as before, whilst thetrichoptiles of the pt. ventrails have not increased in have, however, now appeared on the tliroat and oneach side of the upper part of the breast numerous papillaearranged in distinct chevrons; protruding from some ofthese papillae may be seen the minute tips of the futurefeathers. Pt. alaris (fig. 3, p. 659).—As the fore-limb has now con-siderably increased in size, it is now possible to makeout quite clearl
. Ibis . unchanged, and the same may be said of thept. spinalis, pt. humeralis *, pt. femoralis, and pt. pt. colli lateralis is as distinct as before, whilst thetrichoptiles of the pt. ventrails have not increased in have, however, now appeared on the tliroat and oneach side of the upper part of the breast numerous papillaearranged in distinct chevrons; protruding from some ofthese papillae may be seen the minute tips of the futurefeathers. Pt. alaris (fig. 3, p. 659).—As the fore-limb has now con-siderably increased in size, it is now possible to makeout quite clearly the different members of this tractand their relations one to the other; and as the tri-choptiles are no more numerous than in Stage 1, thisdescription will apply equally to this stage and to that. * The gap between the pt. humeralis and pt. femoralis is somewhatgreater than in Stage 1, but this is owing to increase in the size of thebodv. Embryos and Nestlings of Centropus 3. 659 Dorsal aspect of the right wing of the nestling Centropus siiieJisis,Stage 2, to show the positions of the developing coverts and wing is eutaxic. Ex2ilanatiun of the lettering,t. mar. = tectrices min. = ,, = „ = ,, sp. = ala c. = carpal r. = „ = = cuhitals or d. = metacarpo-digitals or 2. 3-10 = 3-12 = cubitals 1-12. 7 = 7th major covert. The following somewhat tabular statement will, whentaken in conjunction with the diagram, best represent thearrangement of the tract :— Outer Aspect. Matius. Primaries. 10. The 4th to the 7tli are the largest. Tect. majores. 10. Tect. medise. 4 only—viz., the 3rd to the 6th of the series. These are not present in Stage 1. Tect. minores. i T, . • , As vet unrepresented. Ject. marginales. | ■ ^ 660 Mr. R. Shelfbrd o/i the Pterylosis of the Carpal retnex S^- covert are present: the form
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectbirds, bookyear1859
