12 
ZOOLOGICAL LITERATURE. 
II. Stiienombres. Metasthenic. Ijong-amplificate, even when gross- 
amplificate. Snout not a power-organ. Horns, when any, proceeding from 
the endoskeleton, frontal. 
A. SoUpedes. Without horns. Imparidigitate. 
1. Equids. 
2. Macrauchenids (?). 
B. Ruminants. Having horns in the typical group, except often in 
females. Paridigitate. 
1. Cornigers — having horns j frontiferient. 
a. Cervids. h. Antilopids. c. Camelopardalids. 
2. Nudifronts — withoutliorns ; not frontiferient, feeble in self-defence, 
a. Camelids. b. Moschids. c. Anoplotherids. 
C. — 
HI. SiRENiANS. Urosthenic, natatorial. Having a large caudal fin for 
swimming. Posterior limbs wanting. 
Manatus, Halicore, Rhytina, &c. 
In the preceding abstract we have given the principal results 
of that part of Prof. Dana^s researches into a natural system of 
classification which refers to the Mammals ; but no abstract could 
do justice to his ingenious treatment of the subject, and his philo- 
sophical interpretation of the several characters in accordance 
with a principle first defined by himself. Indeed, if the principle 
of cephalization be right and fundamental (as Professor Dana 
believes), its discovery would be a great step towards securing 
unity of system, at a period when zoologists devote themselves 
more and more to the study of special branches, and adopt 
the most various methods of classification. Yet this tendency 
in zoology, to enter into the details of structure and affinity 
of specific forms, is a sign of a healthy development of our 
science. Facts must be thoroughly investigated and accu- 
mulated before any application of a principle like that of cepha- 
lization can be possible beyond the higher divisions of the 
animal kingdom. Therefore we do not think that, at present 
at least, it will be of much practical use; but whether it be 
followed up or not, no one can read Professor Dana^s memoirs 
without being struck by the very many new lights in which the 
relations of the different groups appear, and without feeling a 
desire to test the truth of the prineiple by its application to the 
branch which forms one's own special study. 
QUADRUMANA. 
Dr. Sclater has given a list of the different species living in 
the menagerie of the Zoologieal Society of London, Proe. Zool. 
Soe. 1864, p. 709. It eomprises 21 Simndce^ 10 Cebidm, 10 
Lemuridoij and the Aye- Aye. We mention the Chimpanzee, 
the Orang, Macacus speciosus and M. cyclopis, seven true Lemm', 
and Nycticebus tardiyradus. 
