CA R Y OP II YL L I A CEA . TURBINOLIA DM . 



THE WINGED CUP-CORAL. 

 Paracyaihus pteropus. 



(Sp. imv.) 

 Plate X. Fig. 7. 



Specific Character. Plates in four imperfect cycles ; calice circular ; 

 ribs very salient, dilating into wings below; height less than half the 

 diameter. 



GENERAL DESCRIPTION. 



Corallwm. Cylindrical, adhering by the entire breadth ; height less 

 than half the diameter. 



Ribs. Thin, nearly straight, sub-equal, separated by intercostal spaces 

 about thrice their width, very salient throughout, but from the middle 

 downward developing into triaugular buttresses, the long lower edges of 

 which are adherent to the support, so that the area inclosed by their 

 points is far wider than that inclosed by the wall : their whole surface, as 

 well as that of the intercostal spaces, has a slightly carious, but glossy 

 appearance, not exactly granular. 



Calice. Circular, shallow ; the margin in the same plane. 



I'l'ites. Forming four cycles and six equal systems, those of the fourth 

 cycle wanting in half of each system. They are wide apart, being separated 

 by twice or thrice their own thickness, thin, salient, but unequally so, 

 some of the primaries and secondaries rising to twice the height, above the 

 wall, of the tertiaries, but others are more nearly equal ; their planes are 

 more or less waved, and their surfaces set with scattered blunt eminences : 

 upper edge truncate, nearly horizontal, but slightly declining inwai-ds, and 

 rising with an abrupt blunt point at the inner edge, which then descends 

 perpendicularly. 



Columella. A single flexuous plate, united 

 below to the palules. 



Pal ides. Distinct, united to the inner edges 

 of the primary and secondary plates, and to 

 some (not all) of the tertiary : they are thick, 

 very sinuous, their surfaces set with rounded 

 eminences, and their upper edges much p pteropus 



lobed; they are united by their inner edges (corallam magnified). 



into an irregular horizontal platform, out of the centre of which rises the 

 columella. 



