PLATE 2. 



Zaglossus hruijnii. 



Fig. 4.— Muscles of the right hind leg, ventral aspect, af, adductor femoris, from two heads; al, 

 adductor longus; fld, flexor longus digitorum; g, gracilis (cut); gas, gastrocnemius; pec, 

 pectineus; j>la, plantaris; r/, rectus femoris; sa, sartorius; sm, semimembranosus; so, soleus; 

 St, semitendinosus; va, vastus medialis. X 0.6. 



Fig. 5.— Caecum. X 0.6. 



Fig. 6. — Spleen, ventral aspect. X 0.6. 



Fig. 7.— Larynx, lungs, and heart, ventral aspect, c, cricoid; ce, ceratohyal; 6, basihyal; I, thyroid; 

 ih, thyrohyal. The heart is turned forward, expo.'^ing the azygos lobe of the lungs. X 0.6. 



Fig. 8.— Side view of the skull of an immature Proechidna, showing somewhat diagrammatically the 

 sutures, bo, basioccipital; eo, exoccipital; /, frontal; if, interfrontal; ip, interparietal; j, 

 jugal, greatly expanded, covering part of parietal and squamosal: m, maxillary; n, nasal; 

 p. parietal neariy covered by jugal, its outline shown by broken line; pm, premaxillary; «, 

 squamosal, partly covered by jugal; so, supraoccipital; t, temporal canal. X 0.6. 



Fig. 9. — Larynx in side view. X 0.6. 



