22 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIV. 



22.5 (22-23). The ear in a female in alcohol measures 12.5 mm. from the 

 intertragal notch to the apex. The tail at the base is 3.3 mm. wide and 

 3 mm. deep ; at ro mm. from the tip it is i mm. x i mm. 



Measurements of skull. Adult male and female, respectively: Great- 

 est length 32.7, 29.2; basilar length 28.4, 25; zygomatic breadth 15, 13.8; 

 mastoid breadth 11.4, 10.9; depth of braincase 8.2, 8.1; length of nasals 

 15.1, 14; greatest breadth of nasals 4.3, 4.3; least interorbital breadth 

 7.3, 7.3; length of palate from gnathion 18.3, 16.2; anterior palatal fora- 

 mina 6.3 x 2.5, 5.4 x 2.2; palatal vacuities 6.7 x 3.2, 6 x 3.2; front of 

 upper canine to back of M 4 12.9, 11.5; combined length of four upper 

 molars 5.7, 5.5; combined length of three lateral incisors 3.1, 2.8; length 

 of bone of lower jaw from condyle 20.5, 17.5; angle to coronoid 8, 7.2; 

 depth of jaw at second molar 2.2, 1.7; combined length of four lower 

 molars 6.6, 6.3; exposed length of median lower incisor 6, 5. 



MYOLOGY. 



Plates III-VI. 

 MUSCLES OF THE SKIN. 



Panniculus. Immediately beneath the skin and separable from it 

 only by careful dissecting is a thin, partly membranous and partly 

 muscular layer which may be divided into several rather definite parts 

 but which taken as a whole forms a sac enveloping the entire body and 

 having relatively few and weak ental attachments. On the fore and hind 

 legs it becomes exceedingly thin and cannot be traced beyond the middle 

 of the epipodials. Over the posterior part of the body it is entirely 

 membranous, thicker over the back and sides and very thin over the 

 pectoral muscles. It is attached posteriorly on the biceps femoris length- 

 wise of its caudal fibers; dorsally it becomes slightly muscular and dips 

 beneath the "cruro-coccygeus" to a definite insertion on the dorso- 

 ental surface of the tuberosity of the ischium. 1 It is almost discontin- 

 uous over the pectoral and interscapular regions where it is lost in a thin 

 scarcely perceptible aponeurosis. Over the head it reappears as a thin 

 sheet chiefly membranous except along the under side of the ear and 

 forward on the side of the face to the anterior base of the zygoma where 

 a few muscle fibers run. The principal muscular division proceeding 

 directly from this outer plane, superficial fascia, or panniculus is that 

 which enters the axilla forming the so-called cutaneus maximus. Be- 

 possibly this dorsal part corresponds to the " ischiotergal " slip described by 

 Macalister in Dasypus and by Wilson (1894, p. 6) in Notoryctes. 



