MUSEUM OF COMPARATIVE ZOOLOGY. 133 



Antipathes tetrastieha Pourt. 



Corallum a simple stein, pinnate ; the branchlets alternate and double, 

 i. e. two branchlets starting from the same spot at an acute angle, thus 

 forming four rows, two on each side of the main stem. Towards the base 

 one of the branchlets of a pair is frequently abortive. Sclerenekyma black, 

 nearly smooth, showing short spines only under the magnifier. No succes- 

 sive swellings on the branchlets as in A.filix Pourt. Polyps small. Height 

 of the corallum 3 or 4 inches. 



In 110 and 120 fathoms off Sand Key and the Samboes, Florida. 



Antipathes sp. 



Fragments of a very slender species were obtained off Sand Key in 26 

 fathoms, but not sufficient for identification. They are as thin as horsehair, 

 and less, with short blunt spines, and small distant polyps. 



Antipathes sp. 



Irregularly branching, loosely subflabellate ; sclepenchyma black, with 

 very short and scarce spines. Polyps large, as in A. arborea, Dana. 



Of this species, fragments were dredged up in 195 and 324 fathoms, pre- 

 senting no verv characteristic features in its mode of branching. I shall 

 postpone its identification until an opportunity offers of comparing it with 

 specimens of some of the other described species from the West Indies. 



Caryophyllia cornuformis Pourt. 



Corallum simple, conical, always regularly curved, distinctly but 

 faintly costate. Calicle circular, rather shallow. Septa very little exsert, 

 thin, and somewhat wavy; in six systems of four cycles. Pali opposite the 

 secondary septa only, sometimes twisted. Columella of one or two twisted 

 processes. Height \ of an inch ; diameter of calicle -J of an inch. 

 Dredged in 23 7 and 248 fathoms off Sand Key and the Samboes, Florida, 

 on a bottom consisting of Foraminifera. 



This species resembles a Ceratotrochus more than a Caryophyllia, but the 

 single row of pali separates it from the latter genus. 



All the specimens obtained have the base broken and apparently decayed, 

 even when living, so that they are probably free when adult. One of them, 

 still alive, was attached to the shell of a Xenophorus by the convex part of 

 its wall. 



Coenocyathus vermiformis Pourt. 



Corallum very elongated, cylindrical. Cost;e indicated only by lines of 

 very fiat tubercle 1 ;. Calicle circular, shallow. Septa rather thick, flexuose, 

 not exsert in six systems of three cycles. Pali thick, flexuose, in front of 

 the secondary septa,. Frequently one of the systems remains incomplete, and 



