144 DR. J. E. GRAYS SYNOPSIS OF THE SPECIES 
When the two skulls are placed side by side, the large teeth are just the same 
distance apart, and the different teeth in the two skulls exactly agree in size, position 
and distance from each other. 
2. BOMBIFRONS SIAMENSIS. (Siamese Muggar.) 
The face depressed, elongate, nearly smooth, with a slight nodule in front of the 
orbits. Intermaxillaries rather elongate, half oblong. 
Crocodilus niloticus, Latr. Rept. i. 206, t. —. From Faujas St. Fond, Mont. St. Pierre, t. 43. 
Crocodilus siamensis, Schn. Amph. 157. Gray, Syn. 60; Cat. Tort. & Croc. B. M. 63 (monstrosity) ? 
From Perrault, Hist. Acad. Sci. ili. 255, t. 54. Giinther, Rept. B. I. t. 18. f. 3. 
Crocodilus galeatus, Cuvier, Oss. Foss. v.52, t.1.f.9 (from Perrault). Dum. & Bibr. Erp, Gén.iii.113, 
Crocodilus palustris (part.), Dum. & Bibr. Erp. Gén. ii. 113. 
Crocodilus vulgaris (part.), Gray, Syn. 58. Dum. & Bibr. Erp, Gén. ii, 108?  Miiller & Schlegel, | 
Verh. t. 3. f. 9 (head ?). 
Crocodilus vulgaris, Owen, Cat. Osteol. Mus. Col. Surg. 107, n. 718? 
Bombifrons siamensis, Gray, Ann. & Mag. N. H. 3rd series, x. 269, 
Hab. Siam, Cambogia (MM. Mouhot). 
There is a well-preserved half-grown specimen of this species in the British Museum.* 
It differs from all the specimens of Bombifrons indicus in the collection in the face 
being much longer, and not so tubercular and pitted. 
It has four series of nearly equal-sized, uniformly shaped, and keeled shields, with 
three interrupted series of unequal-sized smaller shields on each of the sides; those of 
the outer series are the longest. 
As the head agrees with the figure of the head from which Schneider named his 
species, I have retained it; and I have little doubt that the two keels which are 
present in that specimen are either an individual peculiarity, or perhaps a character 
that developed itself as the animal approached old age. 
The skull of the young animal in the Museum of the College of Surgeons, no. 718, 
appears to belong to this species; but it requires more comparison. It is clearly a 
Bombifrons, and it is much smoother and longer than the skull of B. indicus of the 
same size and age. Professor Owen observes, ‘The palatine suture between the 
premaxillary and maxillary bones passes obliquely backwards a little way at its 
commencement, and then extends truncated across; but the premaxillary bones are 
larger than in the second Gangetic Crocodile.” There is a small palpebrary ossicle 
above the anterior angle of the eyes.—Owen, /. c. p. 157. n. 718. 
There is a young specimen of a Crocodile, received from Singapore, which somewhat 
resembles the one from Siam in the form of the head, and has six series of strongly 
keeled shields on the back; but the four middle ones, of nearly equal size and form, and 
those of the outer series, are narrower, and there is a series of much smaller ones below 
on each of the sides. I am by no means convinced that this will form a distinct species, 
it is probably only an accidental or a local variety. 
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