A Key to the Skulls of North American Mammals by THIES MONTE L

By THIES MONTE L

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1'1.. ,· : •" ... , ,,,. -· . •. ,·· '. I 1 . ~~ f \ \ • '" • ........ . , , " .. .. I . t ·-- .. -·• ' I '.. • I ... , ... ~ . ·'' .... t... ~ ~r , -; . •. -· •.! ' .. ,, "'... ,. . , "' ~ ... ~ ""o I ' J.. _N.. ~ , ·· ... _ , ••... ,... '.... c. . \ 1' Fig. 83. Diphylla Greatest length of skull 23mm Fig. 84. _, ....... , n ·-·--- ~ Fig. 85. Macrotus Greatest length of skull 22mm Fig. 86. Leptonycteris Greatest length of skull 27mm 51 molars well developed; rostrum short and wide; zygomata complete ...........................................................................

57 56. -Upper incisors pointing downward .............................................. Phenacomys (Fig. 59) -Upper incisors recurved and pointing posteriorly ........................... Arborimus (Fig. 60) 57. -Molars rooted; posterior border of palate a thin-edged straight shelf, continuous from side to side between posterior molars; bullae without internal bony trabeculae ............................................................................................. My odes (Fig. _~ Fig. 55. Ondatra Greatest length of skull 65mm Fig.

Oryctolagus* (Fig. 69) -lnterparietal triangular in outline ..................................................... Sylvilagus (Fig. 70) Fig. 66. Ochotona Greatest length of skull 40mm 43 > Fig. 67. Lepus Greatest length of skull 95mm Fig. 68. Brachylagus Greatest length of skull 50mm Fig. 69. Oryctolagus* Greatest length of skull 80mm Fig. 70. Sylvilagus Greatest length of skull 70mm 44 SORICOMORPHA 1. -Zygomatic arches complete; front pair of upper teeth moderately enlarged and projecting downward or only slightly forward, their longitudinal and lateral diameters appro){imately eciual; teeth white ...........................................................

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