M. T. Thorell on the Argulide. 149 
struct the skull and dentition of this famous marsupial lion 
(Plate XI. fig. 1), which, im my opinion, was not much more 
carnivorous than the Phalangers of the present time. 
I also enclose drawings of sections of 
Lower incisor of Thylacoleo.... Fig. 2. 
a - Nototherium.. Fig. 3. 
‘ a Diprotodon .. Fig. 4. 
* Pa Thylacine .... Fig. 5. 
x Sarcophilus . va Hag: G. 
Upper i incisor of Felis tigris .. Fig. 7. 
Lower SS ¥ Fig. 8. 
showing the relative size of the teeth in these animals, and 
proving sufficiently that the Thylacoleo was far inferior in 
strength to a modern tiger, and no match for ponderous Dipro- 
todons and Nototheriums. The scale of the photographed 
fractions is in inches, the sections are of the natural size. 
I remain, Gentlemen, 
Your most obedient Servant, 
GerARD Krerrt, 
Australian Museum, Sydney. Curator and Secretary. 
May 24, 1866. 
XXVI.—On Two European Argulide, with Remarks on the 
Morphology of the-Argulide and their Systematic Position, to- 
gether with a Review of the Species of the Family at present 
known. By T. Tuore*. 
Amonc the various groups which, during the last few years, have 
attracted the special attention of zoologists, the small Crustacean 
family of the Argulide holds a prominent place. Long represented 
by one species only, which is common throughout a great part 
of Europe, and was already, before the time of Linnzeus, known as 
Argulus foliaceus, this remarkable family has, in the course of 
the last thirty years, received a sudden and unexpected acces- 
sion to the number of its species. Krodyer+, whose writings are 
the most recent upon the animals composing it, gives the number 
of known species as thirteen, of which eight have been described 
since the beginning of the year 1857, and amongst these the three 
species which constitute Heller’s American genus Gyropeltis. Of 
these thirteen Argulide, one (A. giganteus) belongs to Africa, and 
one only (A. foliaceus) also to Kurope ; the remaining eleven are 
all from America. 
* Translated, by A. O’Shaughnessy, from the (fvers. af Kongl. Ve- 
tensk.-Akad. Forhandlingar, 21st series, Stockholm, 1864 (communi- 
cated 9th Dec. 1863). 
+ “Bidrag til Kundskab om Snyltekrebsene,” Naturhistorisk Tidskrift, 
3die Rekke, Bd. 11. (1863) p. 85. 
