524 



ZOOPHYTES. 



a few polyp-cells ($ 74 f); and these prominences are sometimes 

 lengthened into rudimentary branchlets. 



These species are confined to the coral-reef seas, and hitherto have 

 been found only in the Pacific and Indian Oceans. 



At the Sandwich Islands they are, next to the Porites, the most 

 abundant corals of the reefs; and, like the species of the genus just 

 mentioned, they seem fitted for wider ranges of temperature than most 

 of the reef-forming corals. 



This genus was established by Lamarck, and still farther restricted 

 by Blainville, who separated from it the genus Heliopora. The name 

 is derived from the Latin pocillum, a little cup, and alludes to the cell. 

 The Pocillopores pass into the Seriatopores and Sideropores, through 

 the more slender species. 



Arrangement of the Species. 



I. Slenderly branched, no verruca. 



*\. P. acuta. 



II. Regularly cespitose, subdivided or branched, distinct verruca. 

 *2. P. cespitosa. *9. P. squarrosa. 

 *3. P. brevicornis. *10. P. elongata. 

 *4. P. bulbosa. *11. P. ligulata. 

 *5. P. damicornis. *12. P. elegans. 

 *6. P. favosa. *13. P. meandrina. 

 *7. P. verrucosa. *14. P. grandis. 



8. P. clavaria. *15. P. plicata. 



III. Glomerato-ramose. 

 *16. P. informis. 



I. Ramis gracilibus non verrucosis. 



1. POCILLOPORA ACUTA. (Lamarck.) 



P. hemispherice fruticuhsa, ramosissima, ramis 2-4'" crassis, teretius- 

 culis, flexuosis, ramulis extremis 1-1 '" crassis, subremotis, subacutis, 

 " longis. 



Hemispherically shrubby-cespitose, much branched ; branches 2 to 

 4 lines thick, subterete, flexuous ; upper branchlets 1 to 1 lines 

 thick, rather distant, subacute, half an inch long. 



