. Biology of the Heteromyidae. Heteromyidae. Fig. 4A.—The epitympanum of P. longimem- bris DML 4591. Black arrowhead = layer of tra- becular air cells with cavity anteriorly. B. The middle ear of Hetewmys desmarestianus USNM 319464. E = epitympanum (note the air cells below E where the superior wall of the auditory canal has been removed), H = hypotympanum opened ventrally, S = squamosal, white dots = suture between squamosal and temporal, white arrow = auditory canal (the arrowhead lies near the medial end of the canal) large white arrow- head == mastoid cavity and trabecular air cells, small
. Biology of the Heteromyidae. Heteromyidae. Fig. 4A.—The epitympanum of P. longimem- bris DML 4591. Black arrowhead = layer of tra- becular air cells with cavity anteriorly. B. The middle ear of Hetewmys desmarestianus USNM 319464. E = epitympanum (note the air cells below E where the superior wall of the auditory canal has been removed), H = hypotympanum opened ventrally, S = squamosal, white dots = suture between squamosal and temporal, white arrow = auditory canal (the arrowhead lies near the medial end of the canal) large white arrow- head == mastoid cavity and trabecular air cells, small white arrowheads (two rows) = double lay- ered outer wall of mastoid, white bar lower right = 1 Fig. 5. —Middle ear dissection of Liomys ir- roratus USNM 41943. A. Dorsal view of epi- tympanum with heads of malleus and incus in cavity and air cells posteriorly. B. Ventral view of hypotympanum showing layer of trabecular bone. C. Posterior view of mastoid. O = occip- ital, OS = articular site of occipital and sphenoid, oc = occipital condyle, a = anterior, p = poste- rior, large white arrow = trabecular layer of hy- potympanum, small white arrowheads = lip of external auditory meatus, large black arrowhead = head of malleus in epitympanum, small black arrowheads = occipital-mastoid suture, large white dot = mastoid cavity and air cells, white bar in lower right = 1 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brown, James H; Genoways, Hugh H. [Stillwater, Okla. ?] : American Society of Mammalogists
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