192 MESSRS. ADAMS AND ANGAS ON NEW CHITONID&. [May 10, 
very striking contrast ; and although this peculiarity is well described 
by Forster and the older authors, I was at one time inclined to think 
they had united two different species under one name. 
There is a specimen of a male Casarca variegata in the British 
Museum which has not the chestnut termination of the secondaries 
observable in other specimens and in our bird. This I look upon 
as probably a melanoid variety. 
By some authors the curious Anas nevosa, figured in Mr. Gould’s 
‘ Birds of Australia’ (vii. pl. 10), has been arranged as a Tadorna. 
But although this species somewhat resembles the Sheldrakes in the 
form of the bill, its short legs render it readily distinguishable ; and 
the bird may better be called by Bonaparte’s term for it, Stictonetta 
(Compt. Rend. xliii. p. 649), or left as an dnas until we know more 
about it. 
4, Descriptions or New GENERA AND SPECIES OF CHITONIDE 
FROM THE AUSTRALIAN SEAS, IN THE COLLECTION OF 
Grorce Frencu Ancas. By Henry Apams, F.L.S., anp 
G. F. Angas, Corr. Mem. Z.8. 
1. LepIpDOPLEURUS VARIEGATUS, nob. 
L. testa oblonga, convexa, albida, viridi maculata et irregulariter 
fusco ornata, maculis ad latera confertioribus ; valvis termina- 
libus minute divaricatim striatis, ad margines radiatim costatis 
et concentrice sulcatis ; valvis mediis subcarinatis ; areis dor- 
salibus minute divaricatim striatis ; areis lateralibus viz ele- 
vatis, nonnullis tuberculatis, costis radiatis, ad margines con- 
centrice sulcatis, interstitiis minute granulatis. Limbus pal- 
lido-fuscus, squamulis parvis confertis obtectus. 
Long. 18, lat. 8 mill. 
Hab. York’s Peninsula (Coll. Angas.). 
2. LEPIDOPLEURUS SPECIOSUS, nob. 
L. testa elongata, fulva, dorso longitudinaliter rubro-fusco ornata, 
ad marginem cingulis latis, concentricis, viridibus ; valvis ter- 
minalibus et areis lateralibus concentrice costatis, costis pustu- 
losis, interstitiis minute granulatis, areis lateralibus subele- 
vatis; valvis mediis carinatis ; areis dorsalibus crebre divari- 
catim rugoso-striatis. Limbus pallido-fuscus, syuamis medio- 
cribus imbricatis obtectus. 
Long. 35, lat. 20 mill. 
Hab. Port Lincoln (Coll. Angas.). 
3. LepIpDOPLEURUS LIRATUS, nob. 
L. testa parva, elongata, convexa, flavido-fusca, pallide fusco ma- 
culata ; valvis terminalibus et areis lateralibus concentrice re- 
mote sulcatis, dense et minute radiatim liratis, liris confertim 
pustulosis, valva postica elevata, areis lateralibus vix elevatis ; 
