8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



by a deep furrow at the angles of junction ; the mural rim is thin 

 distally, somewhat enlarged at the base ; it bears two small distal 

 spines, simple or bifurcated. The avicularium is large, triangular, 

 without pivot, placed on the mural rim and in the immediate vicinity 

 of the opercular valve. The beak is salient outside of the cell, very 

 slightly curved. At its base a large spine with numerous reticulated 

 filamentous branches covers the zooecium and unites itself to the op- 

 posite side of the mural rim ; the lacunae are little numerous, long and 

 linear. Always on the mural rim in front of the large avicularium 

 there is a small, branching palmate spine placed above the last ramifica- 

 tions of the large spine. The ovicell is hyperstomial, small, convex, 

 granular. 



Measurements. — 



, r/;o = 0.60-0.70 mm . fL:: = o.yK mm 



Opesuun-< , ^^^ Zooecia-^ , 



^ 1^/0 = 0.25-0.30 mm 1 /^ = o.45-o.5o mm 



Number of zooecia in 4 mm", 15. 



Occurrence. — Bialcombian beds at Muddy Creek. Victoria. 



Holotype.— U.S.N. M. no. 85896. 



Family ARACHNOPUSIIDAE Jullien, li 

 ARACHNOPUSIA Jullien, 1886 

 ARACHNOPUSIA LINEARIS, n. sp. 



Plate 2, fig. 2 



Description. — The zoarium is free and bilamellar. The zooecia are 

 distinct, separated by a shallow furrow, very elongated, oval or el- 

 liptical ; the frontal is a pericyst perforated by large lacunae ; the 

 latter are irregular, orbicular or crescentric, arranged irregularly in 

 transverse rows. The opesivun is semielliptical, transverse ; the distal 

 peristome is thin ; the proximal lip is linear, thick, with a large inden- 

 tation on one side ; this indentation is the insertion of a large spine 

 which has disappeared in fossilization. On the side opposite the in- 

 dentation and adjacent to the peristome there is a small triangular 

 avicularium, the beak oriented distally above each opesium, and ad- 

 jacent to the peristome there is another small triangular avicularium, 

 the beak of which is oriented proximally. 



Measurements. — 



. [ho = 0.10 mm . f L.:: = 0.90- 1 . 1 5 mm 



Opesunns , _ ^ Zooecium ■< , 



>- I /o=:o.20 mm I ^ = 0.50 mm 



Number of zooecia in 4 mm'', 9-10. 



Occurrence.- — -Balcombian beds at ]\luddy Creek, Victoria. 



Holotype.— v. S.N. M. no. 85603. 



