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I08 PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



appearance, often compressed transverse to septal plane. Inner edges fall perpendicularly 

 to the bottom of the calice; in its upper part a septum is relatively narrow, about 1.5 mm. 

 wide. Edges dentate, dentations often with secondary granulations; rather irregular, often 

 longer teeth near the columella. Faces with small conical granulations. 



Well-developed, thickish, wide, paliform lobes on the ends of the principal septa; 

 sides densely granulate; margins dentate. 



Columella rather poorly developed, trabecular, false, of loose texture. 



Exothecal vesicles thick-walled; endothecal dissepiments thin. 



Reproduction by unequal fission. 



Facies 6 differs from the others chiefly in the delimitation of the outer septal ends of 

 adjacent corallites, as in all other characters it conforms to those of other specimens. In 

 this character there is inconstancy, as in several instances costae of adjacent corallites are 

 continuous, while in specimens of the more usual facies of the species continuity from one 

 calice to the next is not invariable. For these reasons, this character can scarcely be esti- 

 mated as of specific value. 



From stations at Murray Island, southeast reef, line I, as follows: 



1,020 feet from shore, water 12 inches deep at low tide; practically no current; rocky bottom. 

 1,645 feet from shore; water 13 inches deep at low tide; hard, rocky bottom. 

 1,775 f^<^t from shore, on Lithothamnion ridge. 



Distribution of Favia pallida. — From the Maldives and Chagos eastward to 

 Fiji Islands. 



Uc Favia dan£e{Verrill.) c^^U^ mtJHi ari', iJui ', 



"^ ■' Plate 39, figures i, \a. 



1846. Astraa [Fisficdla] porcata Dana, U S. Expl. Exped., Zooph., p. 226, pi. 1 1, figs. 5, 5a-5<i (non Esper). 

 1872. Fasia dana Verrill, in Dana's Corals and Coral Islands, p. 381. 



The follow^ing is a description of Dana's original specimen (No. 32, U. S. 

 National Museum) : 



Corallum massive, rounded above, 8 cm. tall, and about the same in shorter diameter. 



Calices, greater diameter from 6 to 10 mm.; lesser diameter, 4 to 7.5 mm.; depth about 

 4 mm. Their margins are not at all raised or are only slightly tumid; the intercorallite 

 areas are therefore flat or nearly so, width from 2.5 to 3.5 mm. Costa; thick, about as 

 thick as or slightly thicker than the intercostal furrows, rather low; subequal, correspond 

 to all septa. In some instances there are small costae to which no septa correspond (similar 

 to the condition noted in the description of Favia pallida, see page 105). Costal edges 

 regularly, serrately dentate. The costae from adjacent corallites meet in the intercostal 

 area, usually continuous; occasionally a median ridge is developed for short distances, but 

 is not continuous. 



Septa rather thick, in two sizes, 15 to 16 longer which meet the columella, and as many 

 shorter, in some instances 3 smaller septa between a pair of the longer. In some instances 

 the members of the higher cycles fuse to the sides of the lower cycles, but septal grouping 

 is only slightly developed. The inner margins fall steeply to the bottom of the fossa; they 

 bear fairly regular, large teeth, which are from 4 to 6 in number. Usually there are no 

 distinct paliform lobes, but they are present on some septa and then the septal margin below 

 them is perpendicular and obscurely dentate. Septal faces with fine, conical granulations. 



Columella weakly developed, rather small, about 1.5 mm. in longer diameter. Com- 

 posed of more or less flaky, fused trabeculae. 



Endothecal dissepiments thin; exothecal dissepiments thick, coarse; the exotheca is 

 almost solid. 



Asexual reproduction by subequal fission. 

 Locality. — Tongatabu (U. S. Exploring Expedition). 



There are two specimens of this species from Tongatabu, and it is not repre- 

 sented in the U. S. National Museum from any other locality. Of other specimens 

 it seems most closely related to Facies 2 of Favia pallida (see plate 38, fig. 3), but the 

 latter has thicker septa and much more developed, thicker, and taller pali. Asexual 



