1862.] MR. J. ¥Y. JOHNSON ON NEW CORALS. 245 
ribbed. Colour chestnut-brown, finely and irregularly rayed with 
lighter brown. 
Tab. Sandwich Islands. 
The above species was fished up from twenty fathoms, attached to 
coral. The only species of this form known to live at our islands. 
11. Descriptions or Two Corats FRom MADEIRA, BELONG- 
ING TO THE GENERA PRIMNOA AND Mopsra. By JAMES 
Yate Jounson, Cor. Mem. Z.S. 
(Plate XXXI.) 
Fam. GORGONIID®, M.-Edw. 
Subfam. Gorconin, M.-Edw. 
Sect. Primnoacem, M,-Edw. 
PRIMNOA IMBRICATA, Sp. 1. 
White, having a tendency to branch dichotomously in one plane ; 
the branches slender, flexible, not plume-like, and not anastomosing. 
Axis pale brownish yellow, spineless, obscurely striated, effervescing 
in hydrochloric acid, coated with small white scales composed of 
carbonate of lime. Over the lower coating of scales there is another 
coating of larger scales, with a wide space between the two. The 
outer coat, which is easily removed, appears to be attached to the 
peduncles of the cells. ‘These peduncles are in closely-set whorls of 
three or four, each of which expands into a cup-like cell, having its 
mouth closed in the dead coral with eight scales that have their 
apices in contact. The peduncles project at right angles from the 
stem, and are also clothed with scales. 
This is a much more delicate form than Primnoa lepadifera, in 
which species the pedunculated cells appear to be arranged spirally 
on the branch. 
Two specimens of this elegant Primnoa have been obtained, the 
larger of which has a height of 84 inches, with a width of 11 inches. 
It was attached to a piece of Lophohelia (Oculina) prolifera. The 
whorls of the pedunculated cells are about three-twentieths of an 
inch apart, and the peduncles about the same in height. The prin- 
cipal branch, near the base, has a diameter of one-fifth of an inch. 
The smaller example has been deposited in the British Museum. 
Subfam. Istpinz, M.-Edw. 
MoprsEA ARBUSCULUM, Sp. n. 
The whole coral is coated with a thin brown skin. When this 
skin has been removed from the lower calcareous joiuts, they are 
found to be stony, white, subcylindrical, but rather narrower at the 
middle than at either end. They are finely striate longitudinally, 
and the striz are parallel and straight. The interjoints do not 
