32 Mamm. mammalia. 
compares it with that of other Mammals with a diprotodont dentition. 
Concludes by discussing the probable mode of origin of this type of 
dentition. 
Duval, M. Le Placenta des Rongeurs. J. de l’Anat. Phys. xxvi, 
pp. 1-48, pis. i & ii, and pp. 273-344 & 521-592, woodcuts. 
A continuation of the memoir quoted in Zool. Rec. xxvi, Mamm. p. 28 ; 
the present part describing the placentation of the Rabbit, and concluding 
with an account of the inversion of the blastodermic membranes. 
Fleischmann, A. Die Stammesverwandschaft der Nager ( Rodentia ) 
mit der Beutelthieren ( Marsupialia ). SB. Ak. Berlin, 1890, 
pp. 299-305. [Translated in Ann. N. H. (6) vi, pp. 289-291 (On 
the Relationship of the Rodentia to the Marsupialia).'] 
The author considers that Rodents may be directly derivable from 
Marsupials, urging that we may recognize, step by step, in the existing 
forms, the stages which render the transmission of long-inherited 
structures intelligible. It is added that in the author’s opinion there is 
also an intimate relationship between the Insectivora and Bats on the one 
hand, and the Polyprotodont Marsupials on the other. 
Hochstettek, F. Ueber die Entwicklung der A. [rteria] vertebralis , 
beim Kaniuchen, nebst Bemerk ungen ueber die Enstehung der Ansa 
vieussenii. Morph. JB. xvi, pp. 572-586, pi. xxi. 
Lataste, F. Recherches de Zoo&hique sur les Mammiferes de l’Ordre 
des Rongeurs. ' Bordeaux : 1889, 8vo, 676 pp., 6 pis. * 
A reprint of the author’s papers, published in the Act. Soc. L. Bord., 
on the habits and physiology of various Rodents. 
MaGGI, L. Intorno al Canale Cranio Faringeo in alcuni Rosicanti. 
Rend. 1st. Lombardo (2) xxiii, p. 719, et seq., and pi. [Summarised 
in Boll, scient. xii, pp. 149 & 150.] 
Observations on certain cranial canals in the Hare, Rabbit, and Guinea 
Pig. 
Mearns, E. A. Description of supposed New Species and Subspecies 
of Mammals from Arizona. Bull. Am. Mus. Nat. Hist, ii, pp. 
277-307. 
The new species are all Rodents, and comprise 1 Arvicola , 2 Dipodomys , 
1 Cynomys , and 2 Lepus ; and the new varieties — 1 Sciurus, 1 Fiber , 
2 Hesperomys , and 1 Sigmodon. [See Sciurklce, Muridce , and Geomyidce.] 
Minot, C. S. Die Placenta des Kaninchens. Biol. Centralbl. x, 
pp. 114-122. 
A summary of previous work on the placentation of the Rabbit, with a 
full account of the author’s own researches on the subject. 
Ncssuaum, J. Zur Entwickelungsgeschichte der Placenta bei der Maus 
(weisse Varietat). Anat. Anz. v, pp. 233-236. 
