202 ON THE DERMAL ARMOUR OF JACARE AND CAIMAN 
Inches. 
Syncipital ?:area. in Jength,-about sais xeaveoruniness vases aewreeswiaanen es 24 
re os in, breadth anteriorly’ c.cakawcss cos mvulessterteanne 32 
5 ee ¥ POSLEMON Y cic ainda sien tar gecmaaeneusseUahes 4 
Supra-temporal fossx, Wide ......6. ccc ccccee eee nne ences ese teenenee tenses ees Z 
ag id LONE csaceseentas eavatan axemdnsnmains we cate 1% 
Least width of parietal ........0.ceccccceceeeeeneeeeeeeeeeeneeee pee qs 
Total length of mandible we 205 
Its greatest depth.............. “ wb. 8 
Length of cervical region (or anterior 8 vertebrz) ... 103 
5 dorso-lunithar regiGn:. sa5..25° af semreds carters ieee awe a7 
45 sacral Rie a weet eam AaaseeOaatay: Sadaamemaaes 32 
Wenipth (Of SAUMERUS) panies cans uce i dapinbadncotacaitdanttnatme tes dak bi Aiaddde 8a 74 
35 RUDIYSD Secacaringed nay sess garter Saneiretrapinecaiectianterebi aaa Masenhin Gon chibaneaiueds 54 
oy forésfoot, extreme length, co.cc cevnscisesaeerne aeiianadinentecrceie. 6, 
PC PETA pian csdet <tecaeeieec raters tae eteastsentse eit Aide voc. atewoeed Sere oceanemanie 83 
53 CITA, ncsseidsuasmeweneamonats ntumactetanny aitatlaen chi Hie Ae, queimaialteuly nes .ceae 6 
a6 hind: foot, extrenne lengths scons srernacaganges waneomansesgos aed 9+ 
From the above measurements it will be seen that the skull is 
somewhat slender. Behind the canine groove it widens to the tenth 
tooth, which is 52 inches behind the end of the snout. It retains 
about the same diameter to the twelfth tooth, and then slowly widens 
again,—a sudden increase in size, to the extent of half an inch, taking 
place opposite the posterior margin of the orbit, owing to the flanging- 
out of the jugal. On the whole, however, there is a slow and even 
increase in breadth, from the canine groove to the ends of the ossa 
quadrata. The nasal aperture is pyriform, its wider end being for- 
wards, and its narrow posterior extremity, into which the pointed 
ends of the nasal bones project, attaining the level of the first tooth 
behind the canine groove. 
On the left side there is only a pit for the reception of the anterior 
mandibular tooth, while on the right side this pit is converted into a 
complete foramen. On the upper face of the skull, the pre-maxillo- 
maxillary suture runs vertically upwards through the canine groove, 
and then passes obliquely backwards to a point 5 inches behind the 
end of the snout. The anterior part of this suture lies in a strong 
ridge, which is continued downwards and forwards on the premaxilla 
to the level of the fifth tooth, a groove separating it from the margin 
of the nasal aperture. Posteriorly this ridge dies away, but a curved 
irregular elevation, convex inwards, arises opposite the tenth tooth. 
It is wholly confined to the maxilla, not extending on to the nasals. 
There is a distinct, rough, irregular elevation, bounded on its outer 
' By this term I denote that squarish flat area bounded by the postfrontal and squamosal 
hones laterally, by the occiput posteriorly, and by a line joining the outer angles of the post- 
frontals anteriorly. 
