APPENDIX. 399 



the mouth is nearly vertical ; margin with two folds, 

 subcrenate, and with a broad, but pointed lateral lobe ; 

 entire posteriorly. Rostrum, arising solely from the cell, 

 small, upper half free, projecting, tubular; lateral pro- 

 cesses long, cylindrical, or tapering, free, projecting. 



Hab. — Prince of Wales Channel, Torres Strait, in 9 

 fathoms. 



Colour bright buff, many of the branches having a piebald 

 aspect, or mottled with dark pm-ple patches ; when wetted 

 these portions present a beautiful crimsom colour. Polypi- 

 dom five to six inches high, rising with a strong, tapering, 

 longitudinally grooved stem, which is sometimes sparingly 

 branched, but more commonly simple. Stem and branches 

 pinnate or bi-pinnate, the pinnae and pinnules alternate. 

 The latter are about J inch in length. 



9. P. longicornis, n. sp. 



Cells urceolate, deep, upper half curved abruptly upon 

 the lower, so that the mouth is vertical ; margin subplicate, 

 subcrenate, rising on each side into a broad angular lobe, 

 entire behind, and quite fi'ee fi'om the rachis. Rostrum, 

 rising entirely from the cell, with a broad base, suddenly 

 contracting into a long slender tube, which projects in 

 front a long way from the cell ; lateral processes very 

 long, fr'ce, tubular, projecting suddenly forwards and a 

 little upwards and outwards. 



Hab. — Prince of Wales Channel, Torres Strait, 9 

 fathoms. 



Colour pale buff. Polypidom five to six inches high, 

 consisting of a strong straight, tapering stem, sometimes 

 with a single ascending branch given off near the bottom ; 

 stem and branches pinnate; pinnai li to 1^ inches long; 

 alternate, and arranged ^^ith the utmost rcgulaiity, of 

 uniform length, till near the summit, wlicn they shorten 

 rapidly, so as to give the pol\T)idom a rounded truncate 

 end. The pinnules are excessively fine and delicate, not 



