70 AUSTRALASIAN ANTARCTIC EXPEDITION. 
51, 52.—Liothyrella neozelanica Thomson. Cook Strait, off Wellington, New Zealand. 
Fig. 51, spicules of dorsal body wall of the holotype, near the middle; fig. 52, 
spicules of the ventral body wall, on the side. Enlarged 45 diameters. 
53.—Lnothyrella fulva (Blochmann). Off Maria Island, Tasmania, 65 fathoms. Spicules. 
of the ventral body wall, near the middle. Enlarged 45 diameters. 
54, 55, 56.—Lnrothyrella ovata Thomson. Station 10, off Shackleton Glacier, 325 
fathoms. Holotype. Fig. 56 shows the left part of fig. 55, differently lighted 
to bring out the radial ornament. Enlarged 14 diameters. 
57, 58, 59.—Macandrevia vanhéffeni Blochmann. Station 11, off Shackleton Glacier, 
358 fathoms. Fig. 59 is an anterior view of the specimen shown in figs. 57 
and 58, with the valves gaping as far as the articulation will allow. Enlarged 
1} diameters. 
60.—Stethothyris pectoralis (Tate). Miocene, Aldinga, South Australia, after a specimen 
: in the Dominion Museum. Anterior portion of dorsal valve, ventral view. 
Slightly enlarged. 
PuateE XVIII. 
Fig. 
61, 62.—Liothyrella neozelanica Thomson. Cook Strait, off Wellington, New Zealand. 
Spicules of dorsal body wall of holotype at the side. Fig. 61, enlarged 30 
diameters; fig. 62, enlarged 45 diameters. 
63.—Liothyrella ovata Thomson. Station 10, off Shackleton Glacier, 325 fathoms. 
Spicules of right arm of the holotype, near the proximal end. Enlarged 45 
diameters. 
64.—Liothyrella neozelanica Thomson. Spicules of dorsal side of right arm of the 
holotype, near the distal end. Enlarged 45 diameters. 
65, 66.—-Liothyrella antarctica (Blochmann). Station 2, off Adelie Land, 288-300 
fathoms. Fig. 65, spicules of left arm of the specimen figured in fig. 8, 
plate XV., near the proximal end. The spicules in focus are those of the 
dorsal side. ‘Those underneath them and not in focus are the main plates 
of the ventral side. Fig. 66, spicules of the arms of a young specimen of 
6 mm. dorsal view. Hnlarged 45 diameters, 
