68 AUSTRALASIAN ANTARCTIC EXPEDITION. 
EXPLANATION OF PLATES. 
PuatTE XY. 
Fig. os 
1, 2, 3, 4, 5.—Gyrothyris mawsont Thomson. One mile off south end of Macquarie 
Island. Holotype. Enlarged 14 diameters. 
6, 7.—M agellania goubint Blochmann. Station 8, Davis Sea, 60 fathoms. Enlarged 
1} diameters. 
8, 9.—Liothyrella antarctica (Blochmann). Station 2, off Adelie Land, 288-300 fathoms. 
Enlarged 14 diameters. 
10.—Macandrevia vanhéffen Blochmann. Station 11, off Shackleton Glacier, .358 
fathoms. Dorsal valve, ventral view; the same specimen as figs. 57-59, 
plate III. Enlarged 14 diameters. 
11, 12.—Terebratella vel Magellania sp. Station 10, off Shackleton Glacier, 325 fathoms. 
Enlarged 14 diameters. 
13, 14, 15, 16, 17.—Magellania macquariensis Thomson. Beach, Wireless Cove, 
Macquarie Island. Figs. 13, 14, holotype; fig. 15, paratype, showing greater 
elongation and a straightened front; figs. 16, 17, interior views of paratype. 
18, 19—Crania joubini Thomson. Station 9, Davis Sea, 240 fathoms. Holotype 
. - (dorsal valve). Fig. 18 is a dorsal or exterior view, and fig. 19 a ventral or 
interior view. Knlarged about 34 diameters. 
20, 21, 22.—Lnothyrella fulva (Blochmann). Off Maria Island, Tasmania, 65 fathoms. 
Figs. 20 and 21. show the interior of the valves with the dried animal, and 
particularly the course of the sinuses of the mantle, which are white owing 
to the presence of spicules; fig. 20 shows the interior of the dorsal valve after 
the removal of the animal. Natural size. 
23.—Magellama (?) sp. Station 2, off Adelie Land, 288-300 fathoms. Enlarged 
about 24 diameters. 
24, 25, 26.—Stethothyris antarctica Thomson. Station 10, off Shackleton Glacier, 325 
‘fathoms. Holotype. Natural size. 
27, 28.—Stethothyris uttleyi Thomson. Ototaran, Weston, New Zealand Anterior 
portions of dorsal and ventral valves of paratypes. Natural size. 
29.—Amphithyris buckmant Thomson. Cook Strait, near Wellington, New Zealand. 
Dorsal valve of holotype with the animal, mounted in balsam, viewed 
ventrally by transmitted light. Hnlarged about 15 diameters, 
