40 SMITPISONIAN MISCELLANEOLTS COLLECTIONS VOL. 93 



Measurements. — 



Cha = 0.12 mm . fLs'^ 0.70-0.80 mm 



Aperture-^ , _ ^„ Zooecmm-^ , 



^ I /a = 0.1 7 mm 1 /2 = 0.30 mm 



Number of zooecia in 4 mm"", 20-23. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Colypes.—U.S.lSi.M. no. 85871. 



SMITTINELLA MAGNIPOROSA, n. sp. 



Plate 7, fig. 8 



Description. — The zoarium is bilamellar with narrow, Hat fronds. 

 The zooecia are distinct, separated by a large saHent thread, rectangu- 

 lar, short, elongated ; the frontal is somewhat convex and perforated 

 by a dozen large pores. The aperture is oval, a little elongated ; the 

 proximal sinus is more or less wide, and always rounded ; the lyrule 

 and the cardelles are very fragile. The peristome is wide but not 

 salient. The ovicell is large, globular with a central area orbicular 

 and fragile. The peristomice of the ovicelled zooecia is large, semi- 

 circular, transverse ; the spiramen is large, salient, constant. 



Measurements. — 



r//a = 0.1 2-0. 1 5 mm „ . rLr== 0.50-0.55 mm 

 Aperture<^ , _ Zooecunn-^ , 



^ 1 /a=o.i2 mm 1 /^=: 0.22-0.25 mm 



Number of zooecia in 4 mm'', 25-30. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.—U.S.^.M. no. 85870. 



PORELLA Gray, 1848 

 PORELLA TUBEROSA, n. sp. 



Plate 7, fig. 7 



Description. — The zoarium is bilamellar. The zooecia are distinct, 

 separated by a salient thread, elongated, fusiform ; the frontal is con- 

 vex, covered by tremopores separated by tuberosities. The aperture 

 is suborbicular ; a hollow, rounded proximal indentation serves as 

 orifice for an orbicular avicularium opening into the peristomice ; the 

 chamber of this avicularium is large, smooth, and forms in front 

 of the aperture a large gibbosity. The peristome is thin, little salient . 

 and forms a separating thread. The ovicell is very large ; a small axial 

 ridge separates it into two compartments. The ovicelled zooecia are 

 broader; their aperture is enormous (0.15 by 0.25 mm). 



