PLATE XXIII. 



Streptelasma lamellatum. 



Page 421. 

 Fig. 1. Posterior view of a specimen showing the interior of the calyx. 



. Streptelasma tenue. 



Page 431. 

 Fig. 2. Lateral view of a specimen. 



Streptelasma dissimtle. 

 Page 431. 

 Fig. 3. Posterior view. 



Fig. 4. Similar to the preceding but inclined to show the cup. 

 Fig. 5. Lateral view of a specimen preserving the surface characters. 



Streptelasma inflatum. 



Page 433. 

 Fig. 6. Lateral view of a specimen of the ordinary proportions. 

 Fig. 7. The calical view of the preceding. 



Streptelasma simplex. 

 Page 432. 

 Fig. 8. Lateral view of a specimen. 

 Fig. 9. Posterior view of the same showing the cup. 



Streptelasma laterarium. 

 Page 433. 

 Fig. 10. Lateral view of a corallum. 

 Fig. 11. Posterior view of the same. 

 Fig 12. Lateral view of another specimen. 



