INVESTIGATIONS ON PARAGUAYAN BATRACHIANS. 
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on a leaf with folded limbs, it appears — as to be seen on the plate of 
Mr. Boulenger — entirely of a faded green without any markings and 
is quite protected through its colour, because it seems to be one with the 
leaf, but as soon as it stretches its limbs, it shows the intense bright 
orange colour with the dark markings, which can be regarded as a ter- 
rour-sign against the attacks of the enemies. 
Explanation of plate XIII. 
.Fig. 1. j Dermatonotus Mülleri Btto. Sternal apparatus (X 2). 
pc ■= procoracoideum, 
c = coracoideum, 
ec = epicoracoideum, 
st = sternum, 
sc = scapula. 
Fig. 2. Dermatonotus Mülleri Bttg. Last phalanx (X 10). 
Fig. 3. Dermatonotus Mülleri Bttg. Cross-section through the skin (X 50). 
ep = epidermis, 
ps =z superior pigment-row, 
g = glandulous layer, 
ch — chromataphor-cells, 
eth = epithelium of the glands, 
pi = inferior pigment-row, 
cs 1 == undulated fibres and 
cs~ = horizontal fibres of the corium, 
V — bloodvessels, 
o =. opening of the gland on the epidermis. 
Fig. 4. Chiasmocleis albopunctata Bttg. Sternal apparatus (X 7'5). 
pc si procoracoid, 
c = coracoid, 
cl = clavicula, 
st = sternum. 
Fig. 5. Chiasmocleis albopunctata Bttg. Head (X 3-5). 
Fig. 6. Paludicola signifera Gir. Sternal apparatus (X 5). 
os — omosternum, 
pc = procoracoid, 
c — coracoid, 
ec — epicoracoid, 
, m =■ tendon of a muscle runs down to be inserted into the cartilage- 
plate of the sternum, 
st = bifid bony style of sternum. 
Fig. 7. Paludicola fuscornaculata Stdr. Sternum (X 4*5). 
ec = epicoracoid, 
m = tendon of a muscle runs down to be inserted into the cartilage- 
plate of the sternum, 
a = bifid bony style of the sternum, 
b =z cartilaginous plate of the sternum. 
