100 BULLETIN OF THE 



Corals," was found in this collection. The coral fastened among the pebhlea 

 with which a Phorus has ornamented his shell appears to have flourished 

 remarkably well in that position, as indeed it ought to, having been carried 

 about in search of food, and prevented from sinking in the mud. 

 llange from 200 to 400 fathoms, off Havana and Barbados. 



Caryophyllia antillarum Pourt. 



Range from 82 to 994 fathoms, in 11 stations, off ISuevitas Cuba, Mont- 

 serrat, Guadeloupe, Grenadines, Grenada, and Barbados. 



Caryophyllia communis Mos., var. costata. 



Ceratocyathus zandcus Seg. 

 Plate I. Figs. 12 and 13. 



I agree with Dr. Duncan and Mr. Moseley in joining the genus Ceratocyathus* 

 of Seguenza to Caryophyllia. The numerous species described by that author 

 pass gradually into each other. At one end of the series we have the forms 

 with nearly equal septa and costce, like G. communis ; at the other those which 

 have them very unequal, like G. zaiicleiis. All our specimens are extreme 

 forms, still more marked in the inequality of septa and costse than the last 

 mentioned. 



As Seguenza has a Garyophyllia zanclea as well as a GeratocyatJms zancleus, 

 that name could not well be retained without confusion ; Geratocyathus costatus, 

 however, is the same. 



A series of fine specimens shows the mode of growth. The young are erect, 

 with a thin peduncle attached to a small pebble or shell ; as it grows in height, 

 the support not being sufficient, it falls over on its broadest side, and the ten- 

 dency to grow upward, and to keep the calicle above the mud, produces the 

 curved base. The curvature of those corals which have it in the plane of the 

 smaller diameter is thus easily explained. It is more difficult to understand 

 the curvature in the plane of the greater axis, which is the rule in some species 

 of corals. 



The largest specimen measures 36 mm. on the greater diameter of the 

 calicle, and 31 on the smaller. None of our specimens have more than 16 palij 

 the number can rise to 24, according to Seguenza and Moseley. 



Some of the young specimens are still straight, and resemble very much 

 Moseley's Acanthocyathiis spinicarens. 



Range from 127 to 892 fathoms, in 13 stations, off Santa Cruz, Saba Bank, 

 St. Kitts, Guadeloupe, Dominica, Martinique, St. Vincent, the Grenadines, 

 Grenada, and Barbados. 



* See umler the head of Asterosmilia, iu " Deep-Sea Corals," a rectification of my 

 remarks on this s<?nus. . 



