22 Mamm. 
MAMMALIA. 
of different ages belonging to a single species is greater than between 
equal aged individuals of distinct species ; and then proceeds to notice 
the distinctive features of this structure in several types. 
Yogt, 0., & Speciit, F. The Natural History of Animals (Class 
Mammalia) in Word and Picture. Translated by G. G. Chisholm. 
2 vols. London : 4to, illustrated. 
Waszkiewicz, P. Zur Frage fiber die Beziehungen zwischen der Zalil 
der Fasern in den Nervenstammen und dem Korpergewicht bei 
Saugethieren. Anat. Anz. iii, pp. 206-208. 
A discussion concerning the relation between the number of fibres in 
the nerve trunks and the bodily weight of Mammals. 
Weber, M. Mededeelingen over Zoogdieren. Bijdr. Dierk. 1888, 
pt. v, 16 pp., 2 pis. 
A memoir divided into three sections. The first describes a Mono- 
treme allied to Proechidna bruijnii, but with four digits, giving figures of 
the skull and feet ; the second has remarks, accompanied by a plate, on 
Canis jubatus ; while the third contains tables of the weight of a number 
of Mammals. 
Weitiiofer, A. Beitrage zur Kenntniss der Fauna von Pikermi bei 
Athen. Beitr. Pal. Oesterr.-Ung. vi, pp. 227-292, pis. x-xix. 
An important memoir, based on the results of excavations in the Plio- 
cene beds of Pikermi, conducted, in 1887, by MM. Neumayr and Tausch, 
and also oil specimens from the same deposits preserved in the Hof- 
museurn at Vienna. The Mammals described and figured comprise 1 Mustela 
(new), 1 Hycenarctus (new), 2 Machan'odus (l new), 2 Fells (1 new), 
1 Dinotherium , 1 Hip par ion, 1 Rhinoceros , 1 Giraffa = Camelopardalis 
(new), 1 ProtragelaphuSy 1 Helicoceras (new gen.), and 1 Antilope (?), 
[See Mustelidcdy Ursidce ) Felidae , Equidce, Girajfidce , and Bovidce]. 
. [See also Hycenidce and Proboscidean 
Wilckens, M. Alcuni Osservazioue sulla Fauna delli Ligniti di Casteani 
e di Montebamboli (Torcana). Boll. Com. Geol. (2) ix, pp. 363-368. 
Gives a summary of the Mammalian fauna of these Tuscan Miocene 
beds. Also adds a description of some remains of Enhydriodon campanil ; 
refers the jaw described by Meneghini as Amphicyon laurillardi to a new 
species of Hycenarctos , and describes a new Mustela and Antilope. [See 
Ursidce , Mustelidce , and Bovidce.] 
■ . [See also Equidoe.~\ 
Williams, A. Pathology and its Relation to Evolution. Sci. Goss. 
1887, pp. 80-82, 99-192, & 124-126, woodcuts. [Omitted from Zool. 
Rec. xxiv.] 
In this memoir abnormalities occurring in certain Mammals, such as 
the presence of a centrale in the manus of a Baboon, and a lateral meta- 
podial in the Horse, are described as atavistic features. 
Windle, B. C. A. The Pectoral Group of Muscles. P. R. Soc. xlv, 
pp. 99 & 100. 
An abstract of a paper which attempts to explain the morphology of 
