626 Scientific Proceedings, Royal Dublin Society. 



PLATE XVII. 



Fig. 1. Smittia spathulata, Smitt, nat. size. 



Fig. 2, 2a, 2b, Cellepora granulosa, Hasivell, chitinous appendages, 



x 50. 

 Fig. 3. Cellapora discoidea, Busk, var. frutetosa, nov. var., nat, size; 



3a, x 30 ; 3b, orifice, x 100 ; 3c, operculum, x 100 ; 3d, 



mandible, x 100. 

 Fig. 4. Stichoporina simplex, Koschinsky, nat. size ; 4a, x 25 ; 4b, 4c, 



opercula, x 60 ; 4d, mandible, x 100. 

 Fig. 5, 5a, Bipora crassa, T.-Woods, chitinous appendages, x 100. 

 Fig. 6. Barentsia laxa, n. sp., x 30, 



END OF VOLUME. VI. 



