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MIS; 
George Engelm/ 
530 
THE SCI! 
The second group comprise the true 
genera, vespertilio, phyllostoma, nycte 
In general, the skeleton of the 1 
head is somewhat elongated (the longest in the 
the temporal bone containing the organ of hear 
canine and incisor teeth, the latter varying in m 
upper and from two to six in the lower jaw. The 
six in each jaw. The vertebra of the neck are vei 
loins simple, almost without spinous processes and 
The sacrum is very long and narrow. The tail, when present is short 
to extend the inter femoral membrane and direct the flight The ribs 
bone' are long, the upper portion of the latter greatly expanded lateral 
firm support to the strong collar bones. It has a raised ridge or keel i 
same as in birds. The shoulder blade is highly developed the arm b< 
lengthened and very slender. The fore arm consists of the usual two 
the ulna is quite rudimentary, being also united to the radius The 
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