PART 1.] Lijdvkker ; Teeth of Foetsil T'ldes from Ramri hlmid and Fanjub. 59 
Near Avantipur in Kaslirai'r, I found this season some Cai'boniferous fossils 
in the higher bods of the trappoid rocks, showing that some of these extend 
upwards into the Carboniferous. 
Teeth of Fossil Fishes from Ramri Island and the Punjab, hi) R. Lydekkeu, 
B.A., Geological Survey of India. 
Diodon. 
Among the collection of fossils transferred to the Indian Museum from the 
Asiatic Society of Bengal, there occurs the palatal tooth of a lish, said to have 
been obtained from Ramri (Ramree) Island, oh’ the Arakan Coast, by Captain 
Foley. This tooth consists of a series of horizontal and oval plates, lying ono 
above another. Rach plate is divdded by a vertical line into symmetrical lateral 
jjortions, and the lowest plate seems to have lately separated from another in¬ 
ferior plate. Superiorly the tooth is bevelled away by an oblii^ue and concaj o 
surface of detrition, exhibiting a section of the edges of each of the component 
plates. The longer diameter of the lowest plate is 1'2 inches, and the shorter 
0'7 inch. The above description will clearly show that the tooth belongs to 
the genus Diodon. 
A jirecisely similar tooth was obtained by Mr. Wood-Mason at Port Blair, 
in the Andamans, in a sandstone rock. 
With regard to the age of the deposits from which these teeth were olitaincd, 
it appears from Mr. Mallet’s paper on the “ Mud A olcanocs of Ramri and Chedu- 
ba,'”that the author considers the Ramri rocks to bo of IS ummulitic age: 
Mr. Blanford, in the“AIanual of the Geology of India,-” also classes most of 
the Ramri I’ocks as Niimniulitic, but thinks that some on the eastern side of tlio 
island may bo of cretaceous age. The rocks of Port Blair, according to Air. 
Blanford,^ are similar to those of the Arakan Yoma, which (p. /Id) are also 
Cretaceous and N ummulitic. From the majority of the rocks in Ramri Island 
being of Nummulitic age, and fi’om Diodon not being known elsewhere below 
the Eocene, I think it most probable that the fossil teeth are of Is ummulitic 
age. 
The living Globe Fishes, according to Dr. Gray,’ are inhabitants of all the 
warmer seas, and comprise four species, of wdiioh D. hydnx alone inhabits 
the Indian Ocean. Of the latter species I have examined a small specimen, 
some 10 inches in length. In that specimen the teeth are, of course, much 
smaller than our fossil specimen, but as the living .sjiecies grows to a very large 
size, no distinction can be drawn on these grounds. In D. hydr,x, however, 
the worn surface of both upper and lower teeth is quite flat, while in the fossil 
* Rec. Geol. Surv. of India, Vol. XI, p. 19C. 
p. 717. 
^ loc. cit.f p, 733. 
^ lirit. ilus. Cat. of FUbes, Vol. \ III, p. 306. 
