122 
ME, W. K. PARKER ON THE STRUCTURE AND 
5. The absence of the secondary fontanelles. 
6. The increasing width, forwards, of the cranium, involving the great breadth of 
the girdle-bone. 
7. Superorbital projection of the ethmoid cartilage. 
8. The width, convexity, and solid rostral end of the nasal region. 
9. The three anterior subnasal ossifications. 
10. Slightness of palato-suspensorial arch, with its fixed pedicle. 
11. Bony cpiadrate. 
12. Oblong, oblique, open annulus tympanicus. 
13. Generalised columella, without supra-stapedial process or infra-stapedial segment. 
14. Absence of hyoid band and of antero-lateral lobes of basal plate. 
15. Inferior position of pre-maxillaries. 
16. Reversed shape of fronto-parietals. 
17. Extensive double growth of supratemporal region of squamosal. 
18. Solidity and arcuate form of vomers. 
19. Massiveness of upper labials, and union of the inner pair with pre-maxillaries. 
20. Absence of septo-maxillaries. 
These twenty marked characters of difference from the type show how far removed 
this Frog is from the Rani dm ; its generalised nature is so great that I shall have to 
refer to it for comparison when I come to the Polypedatidae, the Hylidae, the 
Phryniscidse, the Engystornidse, and the Hylaplesidae. 
Fourth genus. Calyptocephalus. 
30. (A) Calyptocephylus Gayi. —Adult female; 5ij> inches long. Chili. 
(A) The adult. — This large, massive, and almost ganoid skull (Plates 21, 22) is, on 
the whole, very Ranine, but it has retained a copious overgrowth of granular sub¬ 
cutaneous bone, which makes it like a strong rough helmet. 
Its general form is half a short oval; it is similar in outline to rather more than the 
narrow end of a short Hen’s egg; for its outline narrows in again behind. Compared 
with its length (from snout to occipital condyles) the breadth is as 4y to 3, and the 
quadrate hinges project 2 lines beyond the occipital hinges, making the skull one- 
eleventh longer at the outside. The actual measurements are— 
1. Greatest breadth, 2 inches 5 lines. 
2. Length from snout to occipital condyles, 1 inch 9 lines. 
3. Extent of quadrate hinges behind them, 2 lines. 
This skull carries the peculiar Batrachian type to its greatest degree, viz.: the great 
width as compared with the length. 
So great is the development of the investing bones that the endocranium is almost 
