588 DR .1. STUART THOMSON ON 



VERRILL, A. E., " Critical Remarks on the Halcyonoid Polyps," No. 3, Amer. Journ. of Science and Arts, 



set. 2, vol. xlvii. New Haven, 1869. 

 VKHRILL, A. E., "Synopsis of the Polyps and Corals of the North Pacific Exploring Expedition, etc., from 



1853 to 1856. Pt. IV. : Actinaria," Proceedings and Communications, Essex Institute, vol. vi. Salem, 



1870. 

 WRIGHT, P., and STUDER, TH., " Report on the Alcyonaria," Report on the Scientific Results of the Voyage of 



H.M.S. " Challenger": "Zoology," vol. xxxi. London, 1889. 



EXPLANATION OF PLATES 

 PLATE I. 



Fig. 1. Bellonella studeri, n. sp. (approx.). Nat. size. 



,, 2. Metalcyonium natalensis, n. sp. x 3. 



,, 3. Alcyonium rotiferum, n. sp. Nat. size. 



,, 4. branch of. x 3. 



5. Alcyonium fauri, n. sp. Nat. size. 



,, 6. Malacacanthus rufus, n. gen. et sp. Nat. size. 



,, 7. Metalcyonium clavatum, Pfeli'er. Polyp. x 27. 



,, 8. patagonicum, May. Polyp, x 18. 



PLATE II. 



Fig. 9. Metalcyonium clavatum, Pfeffer. Nat. size. 



10. Capnella rugosa, Kiikenthal. Nat. size. 

 ,,11. gilchristi , n. sp. Nat. size. 



12. Metalcyonium patagonicum, May. x 2. 



13. Bellonella rubra, Brundin. Nat. size. 



14. Alcyonium pachyclados, Klunzinger. Nat. size. 



PLATE III. 



Fig. 15. Metalcyonium natalensis, n. sp. Transverse section through the coenenchyma of the upper 

 portion of the colony. 



Fig. 16. Alcyonium purpureum, Hickson. Transverse section through the coenenchyma. 



17. Metalcyonium clavatum, Pfeffer. Transverse section through the polyp; the spicules have 

 been dissolved away, and the section passes through the calyx. 



Fig. 18. Metalcyonium natalensis, n. sp. Transverse section through the apical ccenenchyma. 



19. Metalcyonium clavatum, Pfeffer. Transverse section through the polyp (showing ciliated 

 siphonoglyphe and eggs). 



Fig. 20. Eunephthya thyrsoides, Verrill. x 2. 



21. Bellonella rubra, Brundin. (a) Spicules of calyx, xlOO; (b) spicules of internal trunk, xlOO; 

 (c) spicules of external trunk, x 100. 



Fig. 22. Metalcyonium patagonicum, May. The polyp crown, x 30. 



23. Bellonella studeri, n. sp. Polyp. x 8. (In the mounted state, as here represented, the 

 spicules of the calyx do not show their natural arrangement. See text, p. 552.) 

 Fig. 24. Alcyonium purpureum, Hickson. Part of colony, x 10. 

 i 25. Young colony. Nat. size. 



26. Metalcyonium patagonicum, May. Spicules of calyx, x 200. (One drawn with higher 

 power, x 375.) 



