Tympanic bullae are always present and generally large; in some genera, as in the gerbils (Gerbillinae) and jerboas (Jaculidae), there are supplemental mastoid bullae which form great hemispherical bony swellings at the back of the skull (fig. [Please select]
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Greatest length (front base of incisors to end of crest), 18; mastoid breadth, 8. [Please select]
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This specimen is typical of _convexus_ except for the lesser inflation of the mastoid bullae and tympanic bullae. [Please select]
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Both have an arched skull, inflated mastoid and tympanic bullae, short nasals, and a short rostrum. [Please select]
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--One of the most important muscles of the region of the neck in man is the sterno-cleido mastoid. [Please select]
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The sterno-cleido mastoid, whose inferior attachments we mentioned above, cannot have a clavicular portion. [Please select]
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