PLATE IL 



Fig. 13. Stylaster minimus sp. n. 3. The only specimen: a fragment. Cyclosystems all on one surface. 



Fig. 14. Stylaster minimus. ■ 23. Calcined. The gastropore is so shallow, that the style (st.) is visible, it 

 is not however in the centre of the pore. 



Fig. 15. Stylaster tiliatus sp. n. • i'/ 2 - Whole colony as seen from the anterior side upon which all 

 the cyclosystems are situated. The gastropore is very deep. 



Fig. 16. Stylaster umbonatus sp. n. • 3. Part of a colony. Showing all the cyclosystems upon one surface. 



Fig. 17. Stylaster umbonatus sp. n. 20. Showing ampullae and the characteristic large, blunt spines of 

 the species. The gastropore is deep. 



Fig. iS. Errina ramosa sp. n. ■ 1 '/,. Part of a colony. Slightly reconstructed. Showing ampullae (amp.) 

 and the dichotomous method of growth. 



Fig. 19. Errina ramosa. • 15. Terminal branch with two male ampullae (amp.), each situated behind a 

 gastropore scale (gast. se); the two are not always closely associated, but the gastropore is 

 always at the base of a branch and usually on one surface. Side branchlet, with young gastro- 

 pore (y. gast.), scale not yet developed. The style is indicated. Dactylopores on nariform 

 projections all over the surfaces of the branches, even upon the gastropore scales. 



Fig. 20. Errina horrida sp. n. ;< 2. The greater part of a colony: the ends of several branches are 

 broken off. 



Fig. 21. Errina Iiorrida. X 15. Part of a branch showing the scaleless gastropores (gast. p.) in different 

 stages of development and four female ampullae. Y. br. = young branch. The dactylopores 

 are upon nariform projections all over the surface. 



Fig. 22. Cryptohelia ramosa • i'/ 2 - Slightly reconstructed. 



Fig. 23. Cryptohelia ramosa. X 20. Two cyclosystems, one lid (1. 1.) bearing rf ampullae (amp.), the other 

 (1. 2.) is much thinner, owing to the upper part of the lid, including the ampulla, having been 

 sloughed off. The dactylozooids (dac.) are visible; they are not capable of much contraction. 



