346 



MR. A. W. WATERS ON TERTIARY CTCLOSTOMATOTTS 



bably L. variabilis is allied to L. pristis, which in some subcolonies 

 shows a tendency to multiserial rays. 



Loc. Living : lies Malouines. Fossil : near Napier ; Waikato. 



21. LlCHENOPORA WANGANTJIENSIS, Sp. nOV. 



The specimens from Wanganui are in single disks, about 5 

 millim. wide, with 10-20 multiserial rays. The whole of the 

 centre tnmid, with the tumid portion extending between the rays. 

 The covering of this part is reticulated, with a calcareous finely 

 perforated crust between the bars of the reticulation. Zocecial 

 openings about 0*13 millim. wide. 



Lichenopora wanganuiensis, sp. nov. ; semi-diar/rammatic, to show 

 the tumid central area. (Enlarged 7 diameters.) 



There are some less satisfactorily preserved specimens from near 

 Napier, which are usually formed of confluent colonies, with similar 

 structure of the central portion. 



This may be the Discoporella mediterranea of Busk (Cat. Mar. 

 Polyzoa, pt. iii. p. 33, pi. xxxiv. fig. 4) ; but this is doubtful, and 

 it is extremely uncertain whether Busk's is the same as Blainville's 

 and Michelin's species. 



A recent specimen from Port Phillip, which I consider to be L. 

 ecMnata, MacG. *, has the central cancelli closed by a reticulated and 

 perforated crust ; and this is also the case with some subcolonies of 

 what I named Radipora pustidosa from Naples. 



Attention has most been paid to the structure of the rays of 

 Lichenopora ; but, for purposes of classification, it seems that the 

 central portion is the most important ; and this in many cases has, at 

 different stages, quite a different appearance, so that both young and 

 mature specimens should be described. 



This is also allied to L. ealifornica, d'Orb. ; but specimens from 

 Port Western, Yictoria, have the central part covered over with a 

 continuous minutely perforated crust, which spreads for a short 

 distance between the rays. We are hardly in a position at present 



* L. pristis, MacGr., seems to me to be the confluent form of L. echinata, 

 MacGr., and has a similar structure in the centre of the subcolonies. 



