315 
belong to the same genus as the Asiatic animal with which M. Du- 
méril associated it, yet it does not give us the means of knowing to 
which, if to either, of the two African forms, viz. Cyclanosteus and 
Aspidochelys, it should be referred. 
The description of Duméril, and the colouring of the head, &c. of 
the specimen in the Museum, show that it must be distinct from 
Cyclanosteus frenatus and from Cryptopus aubryi (which may be 
synonymous), as it has small white dots on its head ; while C. frena- 
tus, as its name implies, and CO. aubryi, as its figure shows, are not 
spotted, and have black lines on the side of the head and neck. 
Cyclanosteus petersii and Aspidochelys livingstonii have been de- 
scribed from shells of adult animals only, without any remains of the 
bodies attached to them, so that it is not possible to know whether 
either of them be the adult form of Emyda senegalensis, or what is 
the colouring of their head, which is a very distinctive character in 
the animals of this family. 
Cyclanosteus frenatus is known only from a note which Dr. Peters , 
sent home in 1848, shortly after his return from Mozambique. iS 
Cryptopus aubryi is well described and figured by M. Duméril in 
the Rev. Zool. for 1856, p. 374. t. 20, and it appears to be very 
nearly allied to the shield which I have lately described and figured 
in the ‘ Proceedings’ of the Society, under the name of Aspidochelys 
livingstonii (antea, p. 6); but we cannot be certain that the animal 
from Gaboon and that from Mozambique are identical, until we know 
what are the peculiarities of the head of the Mozambique species. I 
may state that Mr. Cope, in the ‘Proceedings of the Academy of 
Natural Sciences of Philadelphia’ for 1859 (p. 295), has formed M. 
A. Duméril’s species into a genus, under the name of Heptathyra, 
in which he evidently intended to include my genus dspidochelys. 
As his paper was read in 1859 and mine in 1860, his name ought 
to have priority, unless it may be found desirable, as there is a con- 
siderable difference between them in the form of the sternal callosities, 
to preserve both the names. 
The African species known in their adult stage may be arranged 
thus :— 
A. Sternal callosities 9 ; hinder pair small. 
1. Cycianostevus. The hinder pair of callosities very small, and 
far apart. 
CApetersii, Gray, Cat. Tortoises, B.M. 65. t. 29. Gambia. 
B. Sternal callosities 7; hinder pair large. 
2. Hepratuyra. The hinder pair of callosities rhombic, united o 
* together by their whole inner edge. rae f? let ) 
H. aubryi, Dum. Rev. Zool. 1856, 364.t.20. ~~ ¢ ns 
oo a y AAs 
Neck with three black streaks, the lateral ones from the eye; = 
ciput with two short black streaks. Gaboon. d é $9 Los  % 
thd wh - 
