431 
‘ Bericht der Konigl. Akad. zu Berlin,’ for 1854, p. 276, where the 
Tortoise from Zanzibar is very briefly described, but under the 
name of Cycloderma frenatum ; and has stated that he believes it is 
the same as the one I described from the Zambesi. Mr. Sclater says 
that he has seen two or three fine perfect specimens of this Tor- 
toise in the Berlin Museum. Under these circumstances, there can 
be no doubt that my name must give way to that used by my friend 
Dr. Peters. 
I may at the same time observe that the genus Cycloderma is so 
characterized by Dr. Peters that it will include all the. African 
Emyda, all of which have the dorsal disk flexible on the margin and 
without any marginal bones. On the contrary, my genus Cyelan- 
osteus, to which I had provisionally referred Dr. Peters’s species, is 
by its character confined to those species of the African Emyde 
which have nine sternal callosities. 
As Dr. Peters, before he published the characters of the genus, 
considered it desirable to change the name of the genus which I had 
adopted from his MS. communication; and founded his genus Cy- 
cloderma on a species that has only seven sternal callosities (though 
he only mentions the number of the callosities in the specific cha- 
racter, and probably would have considered my animal with nine 
callosities as the second species of his genus), I think, if the two 
animals are to be kept in different genera, as I am of opinion they 
ought to be, we ought in justice to retain his name for the restricted 
genus, in preference to my name of Aspidochelys, or Mr. Cope’s 
genus Heptothyra, which are founded on this peculiarity. 
The synonyma of the Zambesi and Zanzibar Tortoise will then 
stand thus :— 
CycCLODERMA FRENATUM, Peters, Bericht. 1859, p. 216. 
Cyclanosteus frenatus, Peters, MS. 1848; Gray, Cat. Tortoises 
Brit. Mus. p. 64.1855 ; Proc. Zool. Soc. 1860, p. 314. 
? Aspidochelys livingstonii, Gray, Proc. Zool. Soc. 1860, p. 5. 
t. 22, and p. 316. 
As the head of the Aspidochelys is not known, and the colour of 
the head forms one of the best characters for the separation of the 
species of Trionychide, we cannot refer the Zambesi species to the 
Zanzibar animal with certainty until an entire specimen of the former 
animal has been examined ; but, at any rate, it appears to bea species 
of the genus Cyclanosteus of Dr. Peters, restricted as I propose. 
6. Descrivtions oF Forty-SEVEN New Species oF SHELLS 
FROM THE SANDWICH ISLANDS, IN THE COLLECTION OF 
Hucu Cumine. By W. Harper Pease, Ese. 
BuLLA MARMOREA. 
Shell ovately oblong, light, thin, perforate, outer lip straight ; 
