marsupialia, monotremAta. 
Mamin. 45 
5. Didelphyidjj. 
In a communication on the Opossums of the Organ Mountains, Rio de 
Janeiro, Goeldi, P. Zool. Soc. London, 1894, pp. 457-467, considers 
that Didelphys aurita is probably entitled to stand as a species. 
Micoureus griseus , M. pusillus , Peramys tristriatuS, and Chironectes 
palmatus are also noticed ; while Didelphys alhoguttata is declared 
to be founded on a specimen of 1 Dasyurus viverrinus. 
Didelphys trinitatis , n. sp., Thomas, Ann. Nat. Hist. (6) xiii, p. 438, 
Trinidad. D. ( Micoureus ) griseus shown by same writer, op. cit. 
xiv, p. 184, to be a Paraguayan form distinct from the Brazilian 
D. (M.) incgna. 
Didelphys australis , p. 33, soricina, p. 36, n. spp., Philippi, Arch. Naturg. 
1894, i, Valdivia. 
Dromiciops, n. g., gliroides , n. sp., Thomas, Ann. Nat. Hist. (6) xiii, p. 187, 
Ohiloe I. 
6. fAMPHITHERIIDAC. 
In the course of his description of the Mammalian romains from Stones- 
field belonging to this and other families, Goodrich (supra, p. 8) 
shows that the lower molars of Amphitherium were of the tri- 
tubercular-sectorial type. 
XI. MONOTB.EMATA. 
McKAy, supra , p. 12, describes the myology of the shoulder-girdle ; 
Wilson, supra , p. 23, proposes a new theory of the homologies 
of the borders of the scapula. For muscles of the eye, see Goppert, 
supra , p. 8. 
1. Ornithorhynchid#. 
Ornithorhynchus anatinus : Manners-Smith, P. Zool. Soc. London, 1894, 
p. 694, has a paper relating chiefly to the muscular anatomy, followed 
by a short description of the trunk-arterial system. As regards the 
anatomy, the author appears to have worked out for the first time 
the comparative morphology of the skeletal muscles of the Mono- 
tremes as determined by their innervation. 
Beddard, in another communication published in the same journal, 
p. 715, deals in the first place with the existence of a free fold passing 
from the bladder to the liver, where it became continuous with the 
falciform ligament of the liver. This fold, however, exhibited no 
traces of an anterior abdominal vein. The author also gives a 
description of the right auriculo-ventricular valve of the heart. In 
