PLATE 19. 



Fig. 39. — Scliizoporella auricidata Hassall. A few zooecia showing 

 rounded avicularium (av.) below the orifice and ooecia (oe.). X 30. 



Fig. 40. — Scltizoporclla auriculaia subsji. ochracea Hiueks. A few zooecia 

 showing the elongated avicularium (av.) below the orifice. X 30. 



Fig. 41. — ScMzoporeUa hiaperta Michelin. A few zooecia showing avicu- 

 larium on each side of the orifice, also the frontal avicularium (av.) and 

 oceeia (oe.). X 30. 



Fig. 42. — Scliizoporella cecili Audouin. A few zooecia showing the char- 

 acteristic orifice (or.) and smooth ooecium (oe.). X 30. 



Fig. 43. — Scliizoporella hyaliiiu Linnaeus. A few zooecia showing reticu- 

 lations between them and the processes on each side of the orifice. X 50. 



Fig. 44. — »S'. hi/alina. Zocecia having well marked transverse ridges, an 

 umbo (um.) below the sinus, and one on the front wall of the ooecium. X 50. 



Fig. 45. — S. hyaliiia. A few zocecia of the more opaque variety with 

 orbicular orifice and a decided umbo below it (itm.). X 50. 



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