140 
the upper surface, wings and tail delicate grey; outer web of the 
external quill greyish black ; shafts of all the primaries white ; irides 
blackish brown ; bill black. 
Total length, 13 inches; bill, 22 ; wing, 93; tail, 61; tarsi, 3. 
Hab. Bass’s Straits. 
HyprocHetipon FiuviaTitis. Hyd. fronte, vertice, et nuchd 
nigris ; corpore superiore, alis cauddque pallide cinereis; facie 
et guld albis, héc colore gradattm ad pectus cinerescente, et hoc 
ad abdomen necnon ad latera nigrescente. 
Forehead, crown and nape deep black; all the upper surface, 
wings and tail light grey; sides of the face and the throat white, 
gradually deepening into grey on the chest, and the grey into black 
on the abdomen and flanks ; under surface of the shoulder and under 
tail-coverts white ; irides black ; bill blood-red ; feet light blood-red. 
Total length, 9% inches; bill, 13; wing, 83; tail, 31; tarsi, 3. 
Hab. Rivers and lakes of the interior of New South Wales. 
Tuatasseus Torresit. Thal. fronte, facie, et collo dorso su- 
periore, partibusque inferioribus lucide albis ; plumis verticis et 
illis oculos circumdantibus albis, guttd parvuld centrali nigra no- 
tatis ; occipite et nuchd nigerrimis ; dorso alisque saturate cinereis, 
caudd pallide cinerea. 
Forehead, sides of the face and neck, upper part of the back and 
all the under surface silky white; feathers of the crown and sur- 
rounding the eye white, with a minute spot of black in the centre 
of each; occiput and back of the neck black; back and wings deep 
grey ; tail grey; primaries greyish black, broadly margined on their 
inner web with white ; the shafts white ; irides dark brown ; bill ochre- 
yellow ; feet blackish grey. 
Total length, 134 inches; bill, 2%; wing, 114; tail, 44; tarsi, 1. 
Hab. Port Essington. 
Nearly allied to S. poliocerca, but much smaller in size. 
STERNULA NEREIS. Stern. vertice et nuchd nigris, hic colore ocu- 
los cingente maculamque anteriorem efficiente, ut non in frontem 
ducto ; fronte albo ; dorso alisque belle ex argenteo-cinereis ; cor- 
pore inferiore, uropygio et caudd albis. 
Crown of the head and back of the neck black, which colour ex- 
tends round the eye, and is continued in the form of a spot before 
that organ ; but this colour does not extend on to the forehead, which 
is white; back and wings delicate silvery grey ; the outer web of the 
external primary dark grey at the base, gradually passing into grey 
towards the tip; all the under surface, rump and tail pure white ; 
irides black ; bill, tongue and feet rich orange-yellow. 
Total length, 104 inches ; bill, 12; wing, 74; tail, 44; tarsi, ;%. 
Hab. Bass’s Straits. 
A paper, “‘ On the Blood-corpuscles of some of the Struthionide,” 
by George Gulliver, Esq., was then read. 
I had lately an opportunity of examining the blood of a young 
