III. SYSTEMATIC ACCOUNT OF THE SIBOGA 

 DEEP-SEA MADREPORARIA. 



MADREPORARIA APOROSA Edw. & H. 



I. Family Ti'rbinolid.-e Edw. & H. 



Twenty genera, including subgenera, of this family are represented in the collection. 



I. Caryophyllia Lamk., Stokes, Duncan. 



The collection contains specimens of seven species of this genus, one of which however 

 is represented only by dead and worn specimens that are hardly identifiable. There are besides, 

 from Station 159, some dead fragments of what may be a Caryophyllia. 



Synopsis of the Siboga Deep Sea species of Caryophyllia. 



I. Coralium free, cornute, septa in six systems and four complete cycles : 



1. Costa; thin and sinuous, those of the first two cycles peculiarly salient 



and trenchant ï. C. cultrifera. 



2. Costae mere granular striations, except in young specimens, in which 



those of the first two cycles are broad and angular 2. C. scobinosa. 



II. Coralium fixed : 



1. Septa in six systems and four complete cycles: 



I. Septa of the fourth cycle larger and very much more exsert 



than those of the third 3. C. panda. 



II. Septa of third and fourth cycles almost equal 4. C. ephyala. 



2. A fifth cycle present in some of the systems, thecal wall with trans- 



verse undulating accretion ridges 5. C. transversalis. 



3. Septa having the appearance of five systems of four regular and 



complete cycles 6. C. quadragenaria. 



1. Caryophyllia cultrifera n. sp. Plate I. Fig. 1, ia. 



Stat. 101. 6°i5'N., i20°2i'E. 1270 m. 1 Ex. 

 In form this species much resembles C. communis Seg. and C ambrosia mihi, but differs 



