SIWALIK AND NARBADA CHELONIA. 
45—199 
B. Nuchal scute concave anter'iorly, and ossifying from a single centre. 
Species 2. Emyda lineata, n. sp. nohis. 
Anterior marginal scute . — The specimen on which this species is founded is the 
broken anterior marginal scute of the left side represented from the dorsal aspect in 
plate XXVI. fig. C ; which was collected by Mr. Theobald in the Siwaliks of the 
Punjab. The specimen agrees very closely in size and contour with the correspond- 
ing scute of the opposite side represented in fig. 4 of the same plate. The sculpture 
has, however, a most distinct linear arrangement ; while tlie individual tubercles are 
smaller, form sharper cones, and are placed farther apart: the sculpture also extends 
nearer to the inner border on the dorsal surface. The specimen indicates an 
individual slightly smaller than full-sized existing specimens of B. vittata. 
Nuchal scute provisionally referred to the present species. — The specimen represented 
in plate XXVI. fig. 3, also collected by Mr. Theobald in the Siwaliks of the Punjab, 
consists of a portion of the left half of the nuchal scute of a somewhat larger 
Bmyda, which from the linear arrangement of the sculpture is provisionally associated 
with the preceding specimen. A peculiarity in which this sj)ecimen differs from the 
nuchal scute of the existing forms of Bmyda will be noticed under the head of B. 
sivalensis. 
Distinctness. — The peculiar arrangement of the sculpture of the marginal is a 
character so marked as to indicate pretty clearly the specific distinctness of this 
form, which it is proposed to ]iame B. lineata. If, as is pretty certainly the case, the 
nuchal scute belong to the same species its specific distinctness is. still more strongly 
marked. 
Distribution.- — Both the specimens described above came from the Punjab, within 
the Indus basin. 
Species 3. Emyda sivalensis, n. sp. nobis. 
Anterior marginal scute . — The left anterior marginal scute of a very large Bmyda 
represented in plate XXVI. fig. 9. from the dorsal aspect was obtained by Mr. 
Theobald in the Siwaliks of the Punjab. In the non-linear arrangement of the 
sculpture this sjiecimen agrees with B. vittata and differs from B. lineata, so that 
comparisons may be confined to the former. The present specimen differs from the 
anterior marginal of B. vittata (fig. 4) by its greatly superior size, its greater 
proportionate breadth, the more convex dorsal surface, as well as by the circumstance 
that while on the dorsal aspect (fig.' 9) the sculpture extends quite up to the inner 
border, on the ventral aspect (shown in the specimen represented in fig. 7) it does 
not extend to within a considerable distance of this border. Both agree in having a 
groove extending along the whole of the posterior surface for cartilaginous union 
with the adjacent marginal. The dimensions of the two specimens are as follows, viz . : 
Speeimen. 
E. vittata. 
Length along inner border 
3-0 
2-3 
Oreatest width 
2-0 
1-1 
L 
