﻿IX. D, 3 



Light: Notes on Philippine Alcyonaria 



235 



but with a wider, more conspicuous axis and with slightly en- 

 larged, divided, and roughened ends (fig. 2, a). Among them 

 are a few heavier spindles, whose axes are not distinct and which 

 show a few projections on the convex surface (fig. 2, b). Prox- 

 imally, the spicules of the latter type increase in number and 

 become rougher and more irregular. Some of these spindles have 

 numerous blunt projections in zones, others have projections on 

 the convex surface, some of them graduate into 4-rayed forms and 

 forms approaching the double stars or capstanlike forms of so 

 many species of Lemnalia (fig. 3). In the extreme base, these 

 double stars and capstanlike forms predominate (fig. 5). 



The spindles of the branch cortex reach a length of 0.15 mm. 

 and a diameter of 0.01 mm.; those of the cortex of the upper 

 stem are from 0.17 to 0.29 mm. in length and from 0.008 to 0.015 

 mm. in diameter; those of the cortex of the middle of the stem 

 are from 0.18 to 0.3 mm. in length and from 0.009 to 0.02 mm. 

 in diameter. The curved spindles of the cortex of the lower 

 stem are from 0.05 to 0.19 mm. in length and from 0.019 to 



Fig. 3. Spicules from the cortex of the lower part of the stem of Lemnalioides kukenthaii. 



X 112.5. 



0.036 mm. in diameter, and the club-shaped forms are from 

 0.08 to 0.12 mm. in length, from 0.04 to 0.05 mm. in greatest 

 diameter, and about 0.025 mm. in least diameter. The spicules 

 of the base are from 0.057 to 0.08 mm. in length, from 0.04 to 0.07 

 mm. in maximum diameter, and about 0.02 mm. in least diameter. 



The spicules of the canal walls are similar in form throughout 

 the whole colony, being smooth, rodlike bodies with roughened, 

 expanded, and divided ends (fig. 4). These increase from an 

 average length of 0.25 mm. and a diameter of 0.009 mm. in 

 the branches to a length of 0.5 mm. and a diameter of 0.026 

 mm. in the base. 



The cortex of the entire colony contains large numbers of 

 unicellular algse. These are particularly numerous toward the 

 base, and give the cortex a characteristic appearance in cleared 

 specimens when examined under the microscope. 



