AUSTRALASIAN TERTIARY BRACHIOPODA 
41 
form. Septum terminating anterior to mid¬ 
length, high anteriorly, posterior segment with 
blunt crest. Loop unknown. 
Adnatida gnangarensis sp. nov. 
Fig. 5A-F 
Name. From the type locality. 
Type material. Holotype WAM 90.247 and two para- 
types WAM 90.248, 90.249 from the Western Aus¬ 
tralian Mines Department Bore No. 5, 44.2 to 46.3 m 
(Pliocene to Lower Pleistocene), Gnangara, Western 
Australia. 
Description. Length of holotype 18.1 mm, 
breadth 13.4 mm, depth 9.0 mm. Moderately 
sulcate. Outline pyriform, greatest width just an¬ 
terior to mid-length. Symphytium concave, car¬ 
dinal margin strongly curved. Hinge platform 
outline elongately triangular; cardinal process 
with lateral segments of posterior surface in¬ 
curved, rim and presumed anterior surface elev¬ 
ated above surrounding fused elements; anterior 
border indented at union with septum. Septum 
terminating anterior to mid-length, crest blade¬ 
like. Loop unknown. 
Magadina Thomson, 1915 
Type species. Magadina browni Thomson, 1915 from 
the Miocene of New Zealand. 
Other species. M. clifdenensis Finlay, 1924; M. thom- 
soni Finlay, 1924; M. waipariensis Thomson, 1915; 
Magasella lunata Tate 1899. 
Occurrence. Australia, New Zealand; Oligocene- 
Miocene, 
Comments. Thomson’s diagnoses (1915, 1927) 
included Australian species now referred to Ana- 
kinetica (compta, cumingii ), Bouchardiella ( ere - 
tacea ), and Parakinetica (deformis). The only 
Australian species now included in the genus is 
M. lunata. Magadina is distinguished from 
other members of the subfamily in the presence 
of a deep hinge trough extending the full length 
of the platform, and in the absence of any medial 
fusion of the crural bases and/or the anterior sur¬ 
face of the cardinal process. 
Magadina lunata (Tate, 1899) 
Fig. 5L-P 
Magasella lunata Tate 1899: 256, pi. 8, fig. 3, 3a. 
(?) Magadina lunata .—Thomson 1927: 276. 
Type material. Holotype SAM T1724A from Croydon 
Bore at 122 to 375 m (Miocene), Adelaide, South Aus¬ 
tralia. 
Other horizon and locality. South Australia. Mannum 
Formation (Lower Miocene): quarry at Mannum. 
Material housed in the Museum of Victoria. 
Measurements. (In mm.) 
Specimen 
Total 
length 
Dorsal 
valve 
length 
Breadth Depth 
SAM T1724A 
7.1 
6.3 
6.9 
3.8 
NMV P134235 
6.9 
5.7 
7.2 
4.1 
NMV P134236 
7.2 
6.1 
7.0 
4.3 
NMV P134237 
7.1 
6.2 
6.6 
4.3 
NMV PI34238 
5.6 
4.8 
6.2 
2.8 
Description. Outline nearly circular; unequally 
biconvex, dorsal valve nearly plane. Anterior 
commissure broadly sulcate. Beak suberect, 
short; deltidial plates conjunct; cardinal margin 
slightly curved. Hinge platform wide, short; cru¬ 
ral bases and socket ridges fused, hinge trough 
wide, deep; cardinal process small, not projec¬ 
ting into hinge trough. Septum terminating just 
anterior to mid-length of valve, high anteriorly. 
Loop with ascending and descending branches 
separate. 
Comments. The Tate Collection in the Depart¬ 
ment of Geology, University of Adelaide, con¬ 
tains a card with five specimens (T1724A-E) 
labelled Magasella lunata. Only one of these 
specimens, T1724A, possesses all the external 
features described and figured by Tate (1899). 
This specimen is plano-convex with anterior sul- 
cation, a permesothyrid foramen, fused concave 
deltidial plates, and a curved cardinal margin. 
The remaining specimens are also plano-convex 
and sulcate but they display different beak 
characters (a hypothyrid foramen, rudimentary 
deltidial plates, and a nearly straight cardinal 
<— 
Fig. 5. A-F, Adnatida gnangarensis sp. nov. A-C, E, holotype WAM 90.247, dorsal, ventral, lateral and anterior 
(dorsal valve uppermost) views, x 2.5. D, paratype WAM 90.248, dorsal interior x 2.5. F, paratypeWAM 90.249, 
ventral interior, x 2.5. G-K, Adnatida deformis (Tate, 1880). G, NMV PI34212, dorsal interior, x 3.5. H-K, 
NMV PI34240, anterior (ventral valve uppermost), dorsal, ventral and lateral views, x 3.5. L-P, Magadina 
lunata (Tate, 1899). L-O, NMV P134235, anterior (ventral valve uppermost), lateral, ventral and dorsal views, x 
4. P, NMV P87579, dorsal, interior, x 5. 
