Plate 33. 



Figs. 1, 2. ^flfs(riopomf areohiUi, new species, (p. 19.) 



1. The iiicrusting zoarium, X 20, showing the pyriforni zooecia, the zooeciules, and the inter- 

 zooeeial areolae. 



2. Another example, X 20, preserving longer zooeciules. 

 Pleistocene: Long Wharf Canyon, Santa Monica, California. 



Figs. 3-5. Membranipora tuhemdata Bosc, 1802. (p. 22.) 



3. A fossil example of this widespread recent species, X 20, with very large tubercles. 



4. Another example, X 20, with the tubercles less developed and the zooecia still retaining their 

 chitinous parts. 



Pleistocene: Santa Monica, California. 



5. Surface of a recent specimen, X 20, showing identity with the fossil form. 

 Pacific Ocean; Santa Monica, California. 



Fig. 6. Membmniponnn cali/ornica Gabb and Horn, lSfi2. (p. 25.) 



Original figure. 



Pleistocene: Santa Barbara, California. 

 Figs. 7-9. Conopeum barharensis Gabb and Horn, 18fi2. (p. 28.) 



7. Gabb and Horn's figure of this species. 



8. A small incrustiiig zoarium, X 20, showing the simplicity of structure. 



9. The incrusting zoarium. X 20, showing the distinct zooecia with thin mural rim and several 

 avicularia. 



Pleistocene: Santa Barbara, California. 

 Fig. 10. Hincksina quadrispinosa, new species, (p. 38.) 



The incrusting zoarium, X 20, illustrating the large elongated zooecia with four distal spines. 

 Two regenerated zooecia are also shown. 



Pleistocene: Rustic Canyon, Santa Monica, California. 

 Fig. 11. /finiisinanutltispinata, new species, (p. 38.) 



Zooecia, X 20, of the incrusting zoarium, showing their small, elongated oval shape and the 

 numerous hollow spines. 



Plei-stocene: Santa Barbara. California. 

 Fig 12 Callopora muUipora Gabb and Horn, 1862. (p. 44.) 



Gabb and Horn's figure of this interesting species, which has not been rediscovered. 



Pleistocene: Santa Barbara, California. 

 Fig 13 Callopora crassospina, new species, (p. 41.) . , „ 



The incrusting type specimen, X 20. The long fusiform avicularium and the six liollow spines 



are to be noted. 



Pleistocene: Santa Barliara, California. 

 Figs 14-lfi. Cmiloramphus triangularis, new species, (p. 48.) 



14. The incrusting type specimen, X 20. The numerous hollow spines and the small triangular 

 a\dcularium are to be noted. 



15. An example showing the ancestrular zooecia, X 20. 



16. .\n ovicelled specimen, X 20. 

 Pleistocene: Santa Barbara, California. 



Fir- 17 rV/uto/-o?)io/(!(s porosMS, new species, (p. 48.) 



The Incrustiig type specimen,X 20, illustrating the large distinct zooecia separated by numerous 



pores. 



Pleistocene: Santa Barljara, California. 

 Figs 18, 19. Callopora horri'Ja Hincks. 1880. (p. 43.) 



18 Unilamellar, recent zoarium, X 20, with areal spines preserved. 



spines. 



Pleistocene: Santa Barbara, California. ^77 



