ON A NEW SIPHONOGORGID GENUS CACTOGORGIA 835 



Another colony, 60 millims. in height and 18 millims. in maximum breadth, consists 

 of a main stem, elliptical in section, with a maximum axis of 9 millims. and a minimum 

 of 6*5 "millims., surmounted by an irregular polyp-bearing portion. After a distance of 

 1 8 millims. the latter bends at an obtuse angle ; after another 1 1 millims. it again 

 resumes a direction almost parallel to the original course ; and yet another flexion causes 

 the whole colony to assume the form of a much-expanded VV- At each bend a small 

 lobe arises. The lowest is 14 millims. in length and 5 millims. in breadth at its origin ; 

 it is expanded laterally, and has a breadth of 9 millims. at the top. The second is 

 12 millims. in length and 11 millims. in maximum breadth; at its origin there is a 

 twisting of the axis, and a small polyp-bearing excrescence arises on the opposite side. 

 The fourth is 6 millims. in height, 8 millims. in breadth, and 4 '5 millims. in thickness. 

 Slightly below the level of the highest lobe the main axis becomes markedly flattened, 

 and attains a breadth of 1 1 millims. and a thickness of 6 millims. 



The ccenenchyma is very hard and densely spiculose ; the surface is arenaceous in 

 appearance, but on examination with a lens the distinct spicules may be seen irregularly 

 arranged, and producing a translucent, shiny surface. 



On the lobes and also on the main stem the polyps are disposed along the edge. 

 The anthocodise are about 3 millims. in length and 2 millims in diameter ; the spiculation 

 is distinctly visible to the naked eye, and the white aboral surface of the tentacles is a 

 marked feature. 



Locality. — Arakan coast, 13 fathoms. 



