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Outside this there is an anvil-shaped lacrymal, Pluvialine in form, but answering to that of the larger types; its lower crus rests upon the outstretched antorbital plate (Plate XXIV. The nasal processes of the premaxillaries were laid upon and wedged in between the upper plate of the nasals {npx, n). 1-5, for views of the skull of Vanellm cristatus, useful for the whole comparison between the Larine and Pluvialine skulls.) The solid part of the premaxillaries is short.

The nasal cartilages (the fore part of which had been removed in the specimen figured) are all cartilaginous, with the exception of the back wall or pars plana (^J/»), which is made bony by a centre of its own. The upper turbinal coil (aliethmoid) divides the groove for the olfactory nerve from that for the trabecular or naso-orbital. A section further back, through the eyes, pituitary space, and lower jaw.

The prootics tilt themselves back to such a degree that the great anterior semicircular canal is thrown, at its junction vrith the posterior canal, into the fore edge of the super- occipital (figs. If this figure (2) be compared with the rest, it vrill be seen how neat is the carpentry by which the great ethmo -trabecular plate rests in the grooved upper surface of the parasphenoidal rostrum {pas). The feeble maxillary (mx) is left in situ, and its maxillo-palatine plate (mxp) is seen rising obliquely and leaf-like, on each side of the cranio-facial notch ; inside of it is the forked and notched double vomer (v) ; the rest of the face has been removed. Os quadratum and stapes of adult Jackdaw {Corvus monedula).

They are scooped laterally for the brain, and have a lunate notch in front, which by a similar notch in the alisphenoid (als) becomes the foramen ovale (5). In front of the former plate there is a large open gap before we reach the short, solid, hooked end of the premaxillary (pa;).

There it stands as a fixture ; but this plate, the great meso-ethmoid, is almost sawn through from below in front of the rostrum, and its under beam is the light and loosely braced vomer. Behind, we see what has been already described in the second stage (compare figs. On the external Anatom,y of Tanais vittatus, occurring with Limnoria and Chelura terebrans in excavated Bier-wood.



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