278 



Total length of colony • . .68 

 Length of rachis . . . .38 



Breadth of rachis .... 4 

 Length of stalk . . . .30 



Breadth of stalk . . . .2 



The axis extends the whole length of the colony ; it is quadrangular in 

 section and concave on all the four surfaces. The polyps are disposed in a 

 single irregular row on each side and are separated by about 4 mm. They are 

 blue in colour and when retracted shine through the thin cutis. The tentacles 

 are about 2-25 mm. long and bear a single row of bluish-brown pinnules varying 

 in number. The zooids are abundant and fill up most of the interspaces be- 

 tween the polyps. They occur in sinuating rows, are of a dark brown colour, 

 and are easily seen with the naked eye. 



The rachis has a glistening appearance due to the hyaline sj)icules which are 

 arranged longitudinally and are grouped more closely around the polyps, forming 

 pseudo-calyces. The polyps are quite devoid of spicules. The zooids are 

 enclosed in diamond-shaped meshes formed of shorter spicules more densely 

 packed. The stalk is cylindrical with a small swelling near the base. It is 

 finely granular in appearance, the cutis being packed with small spicules which 

 are, however, absent in the interior. 



The following are some of the measurements of spicules in millimetres : — 



(a) Eod-like plates, some with regular ends, others more indented, 0-35 x 

 01 ; 0-3 X 0-08; 2 x 01. 



(/;) Spindles, 04 x 0075 ; 0-35 x O'Oo; 0-2 x 0-05 ; 0-2 x 0-03. 



{<;) Spindles with bifurcated ends (the bifurcations sometimes attaining 

 a length of O'l mm.), 04 x 05 ; 035 x 005 ; 0-2 x 004. 



Locality : Gulf of Martaban, 53 fathoms. 



Note on Position of Kophobelemnon intermedium, n. sp. 



The specimen, for which this new species is established, presents many 

 difficulties in classification. It seems to link the two genera Kopliobelemnon, 

 Asbjornsen and Sderohelemnon, Kolliker ; and the alternatives are either to erect 

 a new genus, which seems undesirable, or to unite the two under the older 

 title Kophohelemnon. The following table gives the chief characteristics of these 

 two genera and also those of our type : — 



