172 KKCKNT MADREPOKAKIA OK THE HAWAIIAN ISLAKDS AND LAYSAN. 



\\\- :i coiuparison of llu" (lat;i later prcsoiited with Bernard's tables, or even 

 Bcriuu-d liimsclf had sulHciciit data to hrin^- out this fact, forms of Pvrites closely 

 relali'd to tliosc fi'oni tlu> Hawaiian Islands occur in the Southwest Pacitic and the 

 Indian Ocean. As I did not have tlie material at hand for making detailed com- 

 parisons, the subject of the rclatioriships of the members of the genus must l>i' 

 ])assed with this gcncial icmai'k. 



.SVNOI'SIS <1F TIIK HAWAIIAN SPECIES OF POKITES. 



A. Witliout (/n'liencliyma. 



I. Form riiniose." 



Skeletal structures coarse and rough, irregular in arrangement, pali irregular in develop- 

 ment, of no definite shape or size, 1 septal granule 1. P. mordax. 



Skeletal structures regular in arrangement, pali well developed, definitely arranged, 1 or 2 

 septal granules 2. P. compressa. ^ 



Pali, low, small; 2 to 4 septal granules 3. F. ihierdeni. 



II. Coralluni composed of columniform lobes. 



Caliccs shallow or superficial; pali, 5 to 8, usually G; ilistal ends of septa split; a very prom- 

 inent sejital granule 4. P. evermanni. 



Calices excavated; palar formula complete 5. P. pukoenm. 



ITl. Oorallum massive. 



Surface lobate, glomerate, or mammilate, young explanate or incrusting, calices excavated, 



palar formula complete, interseptal loculi open 6. P. lohata. 



Surface glomerate, calices excavated, palar formula complete, interseptal loculi filling up 



with syn:ij)ticula, texture dense 7. P. gndclii. 



Flattened above, or lobate, calices very deep; fossa narrow; pali poorly developed, usually 4. 



8. P. hrujhainL 

 Surface glomerate, covered with branched spinules, calices very shallow, wall loose, reticular, 



inner ends of triplet free .9. P. lanuginosa. 



Coral lum small, subspheroidal, calices excavated, palar formula usually complete. 



10, P.sluderi. 

 Corallum small tuberose, incrusting nodules, calices superficial, surface densely spinulose, 



inner ends of triplet fused 1 1. P. bernardi. 



t'oralhira small, subspheroidal, surface somewhat glomerate, inner ends of triplet fused. 



12. P. tenuis. 

 IV. Corallum more or less foliaceous. 



(.Jorallum a free lamina, upper surface flat, calices 1 mm. in diameter 13. P. discoidea. 



Corallum a thick lamina, upper surface uneven, calices 1.3 to 1.5 mm. in diameter. 



14. P. schauinslandi. 

 Corallum a small lamina, calices small, 0.75 to 1 mm. in diameter, tending to form series. 



15. P. lichen. 

 Like P. lichen, but corallum larger, calices larger, 1 to 2 mm. in diameter.. 16. P. reliciilosa. 



B. With cienenchynia. 



Form ramose, branches crowded, angular, clavate, uneven 17. P. irregularis. 



Corallum incrusting, upper surface undulate 18. P. hawaiiensia. 



«A\\ of these forms typically have the inner ends of the septa of the triplet free. 



(-No attempt is made in this synopsis to distinguish the "formse" of P. compressa and P. lobata. 



