54 MR. J. GOULD ON A NEW GULL FROM TIBET. [Feb. 9, 
27. Vouuta (Lyria) mMirrz#rormis, Lamarck. 
V. multicostata, Broderip. 
South Australia, on banks of sandy mud in Spencer’s Gulf and 
Gulf St. Vincent. Large and richly coloured specimens are occa- 
sionally washed on shore near the Semaphore at Port Adelaide, in a 
tolerably good state. Those found at Port Lincoln are smaller and 
paler in colour. _I possess a specimen of the latter variety from the 
beach at Buffalo Mouth, South Africa, though I do not find the 
species included in Professor Krauss’s ‘Siid-Afrikanische Mol- 
lusken.’ 
28. Votura (Lyrta) NucLevs, Lamarck. 
The smallest of the Australian Volutes, of which I have obtained 
specimens from the north-east coast, near Cape York. 
29. VouuTa (LyR1A) DELICIosA, Montrouzier. 
A small, compact, delicately marked species from New Caledonia. 
It is very closely allied to V. eassidula from Japan. 
30. MeLo GrorGin&, Gray. 
‘Moreton Bay and Swan River. 
31. Meo umsiticatus, Brod 
Moreton Bay. 
32. Meo pDIADEMA, Lam. 
Port Essington. 
33. MrLo mucrRoNATUS, Sow 
Moreton Bay. 
34. Meo BrRoperipPu, Gray. 
Torres Straits. 
35. Me Lo MILTONIS, Gray. 
Swan River. 
6. DescripTion oF A NEw SPECIES OF GULL FROM TIBET. 
By J. Gou.p, Esa., F.R.S., etc. 
CHROICOCEPHALUS TIBETANUS, Gould. 
Head light chocolate-brown, deepening into black on the nape, sides 
of the head, and fore part of the neck ; back and wings delicate grey ; 
shoulders and edge of the wing pure white; first two primaries 
black, with an oblong patch of white occupying the basal portion of 
the outer web and the corresponding portion of the inner web for 
about half its breadth, and with an oval patch of white near the tip ; 
