PLATE 2. 
Zaglossus bruijnii. 
Fig. 4.— Muscles of the right hind leg, ventral aspect. af, adductor femoris, from two heads; al, 
adductor longus; jid, flexor longus digitorum; g, gracilis (cut); gas, gastrocnemius; pec, 
pectineus; pla, plantaris; rf, 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, ericoid; ce, ceratohyal; b, basihyal; t, thyroid; 
th, thyrohyal. The heart is turned forward, exposing 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. 60, basioccipital; eo, exoccipital; f, frontal; 7f, interfrontal; ip, interparietal; j, 
jugal, greatly expanded, covering part of parietal and squamosal; m, maxillary; n, nasal; 
p, parietal nearly covered by jugal, its outline shown by broken line; pm, premaxillary; s, 
squamosal, partly covered by jugal; so, supraoccipital; ¢, temporal canal. X 0.6. 
Fig. 9.— Larynx in side view.  X 0.6. : 
