40 



M^. A. W. WATEPvS ON TERTIARY CHILOSTOMAT0ES 



6. On Tertiary Chilostohatoes Bryozoa from New Zealand. By 

 Aether Wm. Waters, Esq., F.G.S. (Read December 1, 1886.) 



[Plates VL-VIIL] 



In trie following paper the Chilostomata * from three collections are 

 described, two being kindly lent by Miss Jelly, to whom they had 

 been sent by a correspondent living in the neighbourhood of Napier. 

 They are from Petane and Waipukurau, both representing a well- 

 known horizon, and also some from Waikato f and Trig's Station, 

 Tanner's Run, besides others designated as from the neighbourhood 

 of Napier. 



For the third collection, which is only small, I am indebted to the 

 kindness of Professor Hutton, who collected the material from the 

 base of the Shakespeare Cliff, Wanganui. 



Petane, Waipukurau, and Wanganui are known localities in what 

 is called the Wanganui system, which Tenison-Woods in his "Corals 

 and Bryozoa of the Neozoic Period in New Zealand " (Colon. Mus. 

 and Geol. Survey Dept. 1880), calls "Upper Miocene," but which 

 Professor Hutton more recently (Quart. Journ. Geol. Soc. vol. xli. 

 1885, p. 194) calls "Newer Pliocene." 



The only papers on New-Zealand fossil Bryozoa with which I am 

 acquainted are those by Tenison-Woods, just mentioned, and one 

 by Stoliczka, " On the Bryozoa from the Marine Beds of the Wait- 

 emataschichten of Orakei Bay." The Waitemata beds belong to the 

 Pareora system, and are considered by both Woods and Hutton to 

 be Miocene. 



Of some few the state of preservation is very satisfactory, while 

 with most this is by no means the case ; yet it is often surprising 

 to find how in badly preserved specimens the characters can be 

 distinctly made out by a detailed examination of cell after cell. As 

 an example, I had examined Lepralia semilnna, var. simplex, for 

 over an hour before I could tell which was the right way up ; but 

 when at last I got the key and examined the best-preserved zocecia, 

 the characters were made out as distinctly as in any fossil that I 

 have yet examined. 



The general appearance depends largely upon the conditions of 

 fossilization, and with most of the fossils now examined is quite 

 useless for specific separation ; but during the last few years we 

 have been taught how, in the recent forms, we must look almost 

 entirely to the zocecial characters, and our knowledge of the fossils 

 must be increased by a study of each character separately. It will 

 most materially help the study of the recent Bryozoa when the 

 descriptions are given of the separate organs with the organic integu- 

 ment removed, and this must be done before comparisons are made 

 with fossils. Through the kindness of Miss Jelly I have been 



* The description of the Cyclostoinata will shortly follow, 

 t This is written " Whakati," but I have not been able to find out thatjhere 

 is such a place, wbereas Bryozoa of this age are known from Waikato Heads. 



