246 University of California Publications in Zoology. [Vol. 6 



3. Branches cylindrical, zocecia opening on all sides 4 



3. Branches flattened, zocecia opening on the ventral side only 5 



4. Apertures cm surface of branches of approximately equal size 



Entalophora 



4. Apertures on surface of branch of unequal size Heteropora 



5. Branches flexible, possessing chitinous joints Crisulipora 



5. Branches without chitinous joints Idmonea 



6. Ocecia modified zoo?cia; numerous in each colony Tubulipora 



Tubulipora Lamarck 



Tubulipora Lamarck, 1S16. 

 Tubulipora, Lamouroux, Isl'1. 

 Tubulipora, Johnston, is 17. 

 Tubulipora, d'Orbigny, 1S52. 

 Tubulipora, Busk, 1859. 

 Tubulipora, Busk. 1875. 

 Tubulipora, llincks, 1880. 

 Tubulipora, Harmer, 1898. 



Zoarium with a distinct basal lamina, adnate or erect, begin- 

 ning as a pyriform or fiabelliform colony, which may become 

 lobed by the division of the terminal membrane or growing 

 edge. Lobes short and adherent, or longer and dichotomously 

 divided once or mure often, sometimes becoming erect. Zocecia 

 with a free cylindrical, terminal portion ; or connate in obliquely 

 transverse series separated by Hat septa corresponding with the 

 intersection of two cylindrical zocecia ; series arranged alter- 

 nately on opposite sides of the axial line of the lobe, transverse 

 arrangement usually becoming radial in the distal part of the 

 fertile lobes. Oacium an enlarged zocecium, which extends into 

 the intervals between the parallel or radial series of zocecia. 



The above diagnosis is taken almost bodily from Harmer 

 '98), that writer having made a detailed study of the growth 

 and embryology of this genus and his definition being exact and 

 complete. According to Harmer and also to llincks i '80), and 

 as may be readily seen on inspection of youthful stages, a colony 

 of Tubulipora arises in a circular disk (pi. 21, fig. 25, dk.), 

 the calcified remains of the larva which gives rise to the colony. 

 Prom this the first zooecium develops, and then a second. These 

 two zooecia usually bend away from each other in opposite 

 directions, while between them a third zooecium forms. In this 

 way a fan-shaped or lobed expansion arises, the final shape of the 



