Those which give the antero-posterior diameter or maximum length of the head (from the glabella to the most prominent point of the occiput, as on the cranium) and the transverse maximum diameter, are the first to note.
K L/), or to its partial height from the glabella to the alveolar border of the upper jaw-bone (Fig.
The human skull was small and under-developed, no sutures showing; the forehead extremely low and slanting, almost flattened, with the superciliary region and glabella very prominent.
The glabella was probably prominent and the margins on each side are large and rough and extend outwards to the supraorbital notches.
The base, facial bones and part of the left brow ridge and glabella are gone.
At the left of the glabella there are two large exopodites, the anterior of which lies over and partially conceals the other.
The glabella is about one third the total width, nearly parallel-sided, somewhat pointed at the front.
Unfortunately, the connection with the mouth is not shown, and the form of the hypostoma indicates that the section cut the glabella diagonally, either in the anterior or posterior part, probably the latter.
Its presence or absence may not have any great significance, but when the glabella extends to the frontal margin, it certainly suggests a more anterior position of certain organs.
A number of specimens of this species have been found which show a straight cylindrical tube or its filling, extending from the glabella back nearly to the posterior end of the pygidium.
Sections through the tubercles of the glabella of Ceraurus show all of them hollow, with very thin upper covering or none at all, and their structure is not unlike that of the tubercle of Cryptolithus.
The abdominal sheath extends only along the posterior region of the glabella and the anterior part of the thorax, and probably served to protect the soft organs from the strain of the heavy muscles.
The original canal evidently filled nearly the whole of the dorsal part of the glabella in this particular region.
The strongest, firmest, best-protected place in the whole body of the trilobite is the cavity between the vaulted glabella and the hypostoma.
The single section through the glabella (specimen 97) is of course important and fortunately well preserved (fig.
A section across the cephalon of Ceraurus pleurexanthemus at the horizon of the eyes shows the sides of the hypostoma fitting closely against the sides of the glabella (Walcott's pl.
If a line joining theglabella and the occipital protuberance (a, b, Fig.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "glabella" in a variety of sentences. We hope that you will now be able to make sentences using this word.
