MAMMALIA. 
41 
Phoccena tuhercuUfera may prove to be a synonym of Ph. communis, tlio 
fine denticulation of the front edge of the dorsal fin being tlie rule, and speci- 
mens without the tubercles being very rare. Gray, Ann. & Mag. Nat. 
Hist. 1866, xviii. p. 495. 
Phoccenct hrevirostris, sp. n,, Owen, 1. c. p. 24, pi. 9. figs. 1-3. — Vizaga- 
patam. 
4 Sagmatias, g. n.. Cope, 1. c. 294. Supraorbital expansions of the ossa 
maxillaria obliquely descending and diminishing to a thin edge. No trian- 
gular prenarial depression ; gonys short ; teeth very short, obtuse, numerous. 
S. amhloclon, sp. n., hab. — ? 
•^Beluga angustata, sp. n.. Cope, 1. c. 
J Monodon monoceros. Prof. Lilljeborg corrects an error in the work on 
Cetaceans published by the Hay Society and mentioned above (p. 2), with 
regard to the occurrence of the Narwhal in the Baltic Sea (p. 245 of that 
work). The specimen referred to was not a Narwhal, but a Ilypcroodon. 
Proc. Zool. Soc. 1866, p. 559. 
4 Dr. E. Deslongchamps has given descriptions of skeletons of 
three Cetaceans in the Museum at Caen, viz. of a Ilypcroodon, Mesoplodon 
sowerhyensis, and Dioplodon gcrvaisi (E. E.-D.), from the British Channel. 
Bull. Soc. Linn. Normand. 1866, x. pp. 168-180. 
^Ziphius. The skull of a species, at present not determined, was found at 
Arcachon (Gironde), and is described by P. Fischer in Compt. Rend. 1866, 
August, pp. 271-272 (translated in Ann. & Mag. Nat. Hist, xviii. pp. 
255-257). 
Ppiodon cryptodon, sp. n., Burmeister, Ann. & Mag. Nat. Hist. xvii. pp. 
94-98, 303-305, pis. 3 & 6, from Buenos Ayres. The author regarded it at 
first as the type of a distinct genus, for which ho intended the name of 
Ziphiorrhynchus, 
MARSUPIA.LIA. 
^Petaurus. Prof. Giebel describes the skulls and dentition of various 
species in Zeitschr. ges. Ntrwiss. 1866, pp. 394-396. 
Dactylopsila trivirgata (Gray) occurs also in the Cape York Peninsula, 
North Australia. Gray, Proc. Zool. Soc. 1866, p. 220. 
\ Cuscus macidatus. A variety {ochropus') from the Capo York Peninsula 
is described by Gray, Proc. Zool. Soc. 1866, p. 220. 
n| Phalangista. Prof. Giebel describes the skulls and dentition of various 
species, Zeitschr. ges. Ntrwiss. 1866, pp. 391-394, and thinks that the sepa- 
ration of the subgenera P*’e?«7oc7m’?/s, Trichosurus, and Cwscirs is justified by 
craniological characters. He describes also the dentition of a young Ph, 
07'ientalis (W Rterli.) = Ph, (Temm.), which was on the point of chan- 
ging its teeth. In the intermaxillary appear the two permanent middle incisors ; 
at their side is a thick second milk-incisor much worn, whilst the crowns of 
the minute, compressed third incisor, and of the slender, acute, permanent 
canine, are not entirely visible. The first molar is half as large as the canine ; 
the second is small, subcylindrical ; the third is the bicuspid milk-tooth on 
the right side, whilst on the right the permanent was just cutting the gum. 
Then follow two with two sharp transverse ridges ; the last is just protruding 
from the alveolus. In the mandible there are behind the incisors three pre- 
molars, then a compressed, sharp, conical molar with a posterior cusp, fol- 
