894 PKOF. S, J. IIICKSON ON THE 



B. Coenosteum granular and reticulate, without well-defined 

 coenosteal pores. Grooved spines turned away from the 

 apex of the branches or clustered and irregularly placed. 



The Lahio'pora group, 



Errina aspera Linn. 



Errina fissurata Gray. 



Errina antarctica { = Lahio'pora antarctica Gray). 



Errina moseleyi { = Labiopora moseleyi Ridley). 



Errina novae zelandice Hickson. 



Errina capensis Hickson. 



Errina gracilis von Marenzeller. 



The following species has the grooves turned away from the 

 apex as in the Lahiopora group, but has well defined coenosteal 

 poi'BS ; — 



Errina macrogastra von Mai'enzeller (7). 



[Additional notes on Professor Hickson's paper on the 

 genus Errina, received August 14th, 1912. 



1. The adjective " Hydrocoralline " is used in the title of the 

 paper at the suggestion of the Secretary of the Society for the 

 convenience of Zoologists who do not possess a special knowledge 

 of these Coelenterata. I have in several previous papei's declared 

 my opinion that to unite Millepora with the Stylasterina in one 

 Order, the Hydrocorallina, is unsound. I have found no reason 

 to change my mind in that respect. The word " hydrocoralline " 

 may still be used, however, to signify the corals that are Hydrozoa 

 in very much the same way as the words "corals," " zoophytes," 

 " worms," are used, without any strict systematic significance. 



2. Since the paper was read I have been able to examine a 

 number of specimens in the possession of the Museum d'Histoire 

 Naturelle, Paris, for which I am indebted to the kindness of 

 Prof. Joubin. 



In this collection there are some specimens which I have 

 identified as Errina dabneyi Pourt. from the Azores. An 

 examination of these specimens convinced me that they belong to 

 the Lahiopora group of species, as they exhibit all the charac- 

 teristic features of that group. From this it seems probable, that 

 the other two species, E. glabra and E. cochleata, that were in- 

 cluded by Pourtales in the genus Lepidopora should also be 

 transferred from the Errina to the Labiopora group.] 



Literature. 



(1) J. E. Gray.— (No title.) Proc. Zool. Soc. 1835, p. 85. 



(2) J. E. Geay. — Notes on Corals from the South and Antarctic 



Seas. Proc. Zool. Soc. 1872, p. 744. 



(3) S. J. HiCKSOX. — The Gonophores of Allopora and Disticho- 



pora. Quart. Journ, Microscop. Sci. vol. xxxii. 1891, 

 p. 382. 



