PLATE XVII. 
Tryplasma princeps, Eth.Jil. 
Fig. 1. The largest single eorallite known, with above a bud (a), which at first sight would 
appear to be wholly parietal, but in reality is half parietal, half calicular. 
a. Bud. 
h. Radiciform basal processes. 
c. Radiciform process, or fistula ('?). 
Fig. 2. Base of a similar eorallite to Fig. 1, with radiciform processes («), lateral view. 
Fig. 3. Base of a smaller cylindrical eorallite, with radiciform processes («). 
Fig. 4. Polished section of a large calice, exhibiting septal lamella! and spines. 
Fig. 5. Polished section of a small eorallite taken near the base, distinctly showing septal spines 
of two orders. 
Fig 6. Naturally-weathered longitudinal section of a curved eorallite, exhibiting very incomplete, 
and at times distant tabula?, doubtfully re r erred to this species. 
Tryplasma liliiformis, Eth.fl. 
Fig. 7. Small eorallite rapidly expanding to form the large calice, with calicular bud above (a). 
Fig. 8. A similar eorallite without a bud, but with distinct rugae. 
