30 ME. A. ^Y. WATERS ON 



59. Retepora elegans, Reuss. (PI. IV. figs. 9, 10.) 



Retepora elegans, Rss. Foss. Polyp. Wien. Tert. p. 48, pi. vi. 

 fig. 38. 



There are only unbranched fragments from Brendola. The sub- 

 oral pore is at the end of a groove. The ovicells are recumbent ; 

 and there is sometimes a ligulate avicularium on the front of the 

 zooecium. The zocecia are wide at the distal end, but narrow at 

 the proximal ; the lateral zooecia are obliquely arranged ; and this 

 gives the dorsal surface a very characteristic appearance, with the 

 zocecia turned alternately to the right and the left. 



Loc. Reuss's description is from a specimen from the Yal di 

 Lonte ; Brendola. 



60. Cellepora PROTEiPORiviis, Rouss. (PI. lY. figs. 13, 14.) 



Escliara diplostoma, Reuss {non Phil.), Foss. Polyp. Wien. Tert. 

 p. 71, pi. viii. fig. 34. 



Celleporaria proteiformis, Reuss, Bryoz. von Crosaro, p. 264, 

 pi. XXX. figs. 2, 6-8. 



Cellepora diplostoma, Pergens, Bryoz. von Wola Lu'zanska, p. 72. 



This is one of the holostomatous * Gelleporce, with a large trian- 

 gular avicularium at one side below the aperture, and with a large 

 globular ovicell, perforated in the same way as the surface of the 

 zoarium. At present only two Gelleporce are known living from the 

 northern hemisphere having the lower edge of the oral aperture 

 straight, namely C. sardonica, Waters, and C. peiHusa, Smitt ; but 

 the group is better represented in the southern hemisphere ; and it 

 is interesting to find this species very abundant in the Lower 

 Tertiaries. In one specimen I have found a large spatulate 

 vicarious avicularium. 



In the specimen, fig. 14, on one side aUbut three zooecia are flat, 

 with large pores on the surface ; but the three are raised in a 

 somewhat ovoid shape, and are at once seen to resemble the zocecia 

 of 0. proteiformis. Turning the fragment over, we find that on the 

 other side about one-half of the zocecia are raised above the surface, 

 like big ovicells ; and there is now no difficulty in recognizing this 

 as a stage of C. proteiformis. It was only, however, at the eleventh 

 hour that the flat, compressed form, and the cylindrical one, consist- 

 ing of several layers, were seen to be stages of the same species. 



The description and figure of E. diplostoma are so insufficient that 



* MacGillivray proposes to leave these to form the genus Cellepora, while 

 he calls those with a schizostomatous aperture Schismopora. As the latter were 

 the earliest known, it might have been better to give a new name to the holo- 

 stomatous group, but this is not a matter of much importance. In 1881 I 

 pointed out that there were a number of Celleporce with the oral aperture 

 straight below, and that, perhaps, they should form a subgenus. For a long 

 time workers have recognized that Cellepora, as understood, could not stand ; 

 and, therefore, when Jullien reproaches us for retaining the genus, it shows an 

 imperfect acquaintance with our work ; and I still maintain that science has 

 been better served bj showing relationship and collecting facts than by pre- 

 mature classification, 



