262 



MB. AETHTTE W. "WATEES ON 



Table {continued). 





Fenestras. 



Pro- 

 portion. 



Branches. 



Long. 



Wide. 



Wide. 



Retepoea-tessellata Group. 



E. Imperati, B. ; Chall. . . . 

 eloreata, Stu 



millim. 

 2-4 

 4-0 



1-0 



0-S 



4-0 



2-2 

 0-7 

 1-8 



millim. 

 1-0 

 1-0 



0-7 

 0-4 



20 

 1-0 

 0-4 

 0-5 



1-0-4 

 1-0-25 



1-0-7 

 1-0-5 



1-0 



1-0-45 

 1-0-57 

 1-0-3 



millim. 

 06 

 1-0 



0-8-1-2 



1-5 



0-8 



1-0 

 10 

 0-9 

 0-4 





Retefoea with Lepealiod 



Ol'EECULUM. 



R sinuosa, KirJcp , 



novae zelandise, Waters ... 



Unceetain position. 

 R. gigantea, B 





lata,5 



avieularis, Mac G 





Eetepoea Cottchii, var. biaticttlata, var. nov. (PL YI. 

 fig. 18.) 



In a JRetepora from Naples sent to me named JR. reticulata, 

 Lamk.*, the two prongs of the peristome each carry a small round 

 avicularium at the end, whereas in normal R. CoucMi the " wing- 

 like processes " of Hincks do not bear an avicularium; on the 

 other hand, the labial and ooecial fissures and other characters 

 correspond with those o£ It. Couchii. 



This variety I have since found in the material I collected from 

 Naples and also from Capri, and further fossil from the Upper 

 Tertiaries of Testa del Prado, near Eeggio, Calabria, but in this 

 case with the meshes about half the size of the living specimens. 



Eetepoea Cottchii, S., var. apoeosa, nov. (PI. VI. fig. 22.) 

 Specimens from Eapallo have a rostrum which sometimes 

 carries an avicularium, but more often it is merely a barren 

 process. There is no labial fissure or pore, nor is the peristome 

 as much developed as is usually the case in B. Couchii ; on both 

 the anterior and dorsal surfaces there are small oval avicularia ; 



* The description of i?. reticulata given by Lamarck was quite insufficient, 

 while the figure to which he referred represents Frondipora verrucosa. 



