43 



XXIX. Subgenus Coenopsammia Edw. & H. 



Synopsis of the Siboga Deep-sea species of Coenopsammia. 



The calicles are empty-looking, owing to the septa, which are subequal, being little more 

 than ridges: 



1. Corallites subcylindrical, the mouths of the calicles about four millim. 



in diameter: 



I. Corallites on both sides of the branches, none in the axils i. C. profunda. 

 II. Corallites usually present in the axils of the branches and 



on only one side of the branch 2. C. amplielioides. 



2. Corallites funnel-shaped, the mouths of the calicles about 2 millim. in 



diameter: no coenenchyma I- C. pusilla. 



69. DendropJiyllia (Coenopsammia) profunda Pourt. 



DiploJielia profunda Pourtales. Bull. Mus. Comp. Zool. Vol. I, 1863 — 69, p. 114. 

 Dendrophyllia profunda Pourtales. Bull. Mus. Comp. Zool. Vol. V, 1878 — 79, p. 208, pi. I, 

 figs. 6—8. 



Stat. 266. 5° 56'.5 S., i32°47'.7E. 595 m. 2 Ex. 



At first sight this species would be taken for an Ainphihelia (Diplohelia)^ as indeed 

 it at first was by Pourtales. 



Distribution. Gult of Mexico : Banda Sea : Sea off Ceylon. 



70. Dendrophyllia (Coenopsammia) amphelioidcs n. sp. Plate V, fig. 37, 37a. 



Stat. 156. o°29'.2S., 130° S'o E. 469 m. Some dead fragments. 

 Stat. 177. 2°24'.-5S., I29°38'.5E. 1633 m. Some fine branches. 



This species is very closely related to, if it is not identical with, Coenopsammia scillce 

 Seguenza (Mem. Accad. Sci. Torino 2 Ser. XXI, 1S64, p. 519, tav. xiv. fig. 2). Like Den- 

 drophyllia proftmda Pourt., it at first sight strongly simulates an Amphihelia, for which in 

 my preliminary sorting of the collection I mistook it. 



Colony dendroid, gemmation taking place near the calicular margin and being alternately 

 distichous or, more commonly, dichotomous leaving the |)arent calicle immersed and more or 

 less compressed between two branches, as in Cyathohelia. The openings of the calicles all tend 

 to face one way, and are commonly circular (except in the axils). 



Costal striations all equally distinct, in the form of finely scabrous vermicular ridges 

 traversing the whole length of the colon}'. 



The calicles after budding are little prominent, or even almost immersed : they are deep 

 and empty-looking owing to the shallowness of the septa. 



Septa approximately equal, elegantly notching the somewhat tumid margin of the calicle 

 but not exsert, not encroaching on the calicular fossa. They are in six regular systems and 



