374 Transactions. 



EXPLANATION OF PLATES XVIII-XX. 



Plate XVIII. 



Fig. L Leiotealia thompsoni. Directive mesenteries, parts of four other mesenteries, 



body-wall, and siphonoglypli. 

 Fig. 2. Leiotealia thompsoni. Cross-section of sphincter muscle. 



Plate XTX. 

 Fig. L Leiotealia thompsoni. Body-wall, showing the ridges into which the outer 



surface is thrown (cross-section). 

 Fig. 2. Leiotealia thompsoni. Body-wall, showing the mesoglcea pits lined by ectoderm. 

 Fig. 3. „ Part of tentacle (cross-section). 



Plate XX. 



Fig. L Leiotealia thompsoni. Showing embryos developing within the body of tbe 

 parent ; one embryo at the " 2-chambered " stage, the first pair of mesen- 

 teries just developing ; the other advanced to the 12-mesenteried stage. 



Fig. 2. Sagariia albocincta. Directive mesenteries. 



Fig. 3. ,, Ci'oss-section of sphincter. 



Art. XXXVJ. ■ — A Revieiv of the New Zealand Actiniaria known to 

 Science, together with a Description of Twelve Netv Species. 



By F. G. A. Stuckey, M.A., Wellington. 

 [Bead before the Wellington Philosophical Society, 1th October. 1908.] 



Introduction. 



This paper was written under the supervision of Professor H. B. Kirk. 

 M.A., of Victoria College, Wellington, to whom I desire to express my deep 

 sense of gratitude and obligation for instruction in biological method during 

 a three-years course of study, and particularly for his advice and assistance 

 in preparing the present paper. My thanks are also due to Mr. William C. 

 Davis, for instruction in the art of micro-photography ; and to Mr. H. 

 Farquhar, who assisted m-e in the identification of species known to him, 

 and also supplied me with a list of works on the subject. 



Historical. 



Considering the richness of the actinian fauna of New Zealand and the 

 attractiveness of the work, it is strange that so few workers have studied 

 this subject. Up to the present date, only three New Zealand workers 

 have published accounts of Actiniaria : 1874 — Coughtrey ; one species. 

 1878 — Hutton ; nine species (five new ; one previously described in the 

 account of the Dana Exploration Expedition ; two described by Quoy and 

 Gaimard, voy. " Astrolabe " ; and one previously described by Coughtrey). 

 1 898 — Farcjuhar ; seven new species. The first two writers gave only 

 external characters, but Farquhar described the internal anatomy of one 

 of his species. 



With the exception of Minyas viridula, all the species so far described 

 are littoral. It is a remarkable fact that there were none of our New Zea- 

 land species in the " Challenger " material. So far as I can ascertain from 

 a careful scrutiny of Hertwig's lists, the expedition took no actinans in 



