MADREPORARIAN CORALS 331 



compressed and shallow calice; the thick column is due to an extensive deposit of 

 corallum outside its theca. Low costae, their surface finely granular, corresponding to 

 the cycles of septa, extend down as far as the polyps, viz. to the part where the calice 

 enlarges. The septa vary in thickness and exsertness according to their cycles, of which 

 I to III are approximately equal in the larger specimens; all are relatively little exsert, 

 the largest seldom extending more than 2 mm. above the theca. All the septa are 

 relatively smooth and thin. The trabeculae joining I-III to the columella are generally 

 clearly visible in surface view. 



The aim in growth is 24 pali situated before septal cycle IV, plates very slightly thicker 

 than the septa and relatively smooth; they are joined by trabeculae to the columella. 

 The columella consists of relatively thin, twisted ribbons, the number of which varies 

 with the compression and depth of the calice but is always large. The surface of the 

 columella is upstanding and rather domed. 



St. 190, 315 m., largest 33 mm. high and 24:' 21 mm. in diameter of cahce, 20 pali, 

 80 septa, septa and costae less differentiated than in the figures of Ed. and H. but very 

 closely resembling those of Marenzeller. The next is 34 and 22 x 18 mm. with 24 pali, 

 and there are 7 smaller specimens and many fragments. 



St. 399, 141-102 m. ; a specimen 4 cm. high, calice 32 by 24 mm. much thickened by 

 worm tubes at its base. 



Caryophyllia profunda Moseley. 



Moseley, 'Challenger' Exp. p. 138, 16 (1881); Gardiner, Trans. Roy. Soc. Edinb. xlix, 688 

 (1913)- 



St. 6, 80-140 m., 12 corallites. The largest specimen is 37 mm. high and 25 :< 19 mm. 

 in diameter of calice, 12 septa especially prominent both in thickness and in exsertness, 

 20 thin plate-like pali, septa to correspond ; one specimen has calice twice as long as 

 broad (20 x 10) with 16 pah and all costae well marked and the smallest calice is 9 mm. 

 in diameter with 12 pali. All show a similar differentiation in septal size and the costae 

 are in prominent cycles; the smaller specimens have relatively thicker pali. The remarks 

 in the second reference above on the specimens from the Scottish National Antarctic 

 Expedition apply equally well to the present specimens. All have relatively smooth 

 septa, not heavily spined, and trabeculae joining septa I-III to the columella are seldom 

 visible in surface view. 



St. 1 187, 135-134 m. A corallum which had become attached to some sohd body and 

 grown up for 5 cm. into a bent horn, its calice 27 x 19 mm. ; it has 21 pali. A second has 

 become attached to the side of the same and grown up for 37 cm., its calice nearly 

 round, 17 mm. across, septa thinner and less exsert, 24 pah; were the two not joined 

 this latter corallum might well have been ascribed to C cyathus above. Also a dead 

 specimen attached to a pebble which has become overgrown by a polyzoon. 



Caryophyllia arcuata (Ed. and H.). 



Ed. and H., Ann. Sci. Nat., ser. 3, ix, 290 (1898); Cor. II, 16 (1857). 



Lacaze-Duthiers, Arch. Zool. Exp. gen. ser. 3, xv, 91-107, v (1897); Gravier, Res. Camp. Sci. 

 Monaco, lv, 25, II 26-9 (1920). 



