﻿242 The Philippine Journal of Science 1914 



large numbers in the tentacles of two species. It seems very- 

 probable that the spicules here referred to are the stomodseal 

 spicules which may sometimes be made out through the polyp 

 walls of cleared specimens. 



I propose still further to emend the diagnosis of the genus 

 Lemnalia to read as follows : 



Genus LEMNALIA Gray emended 



Generic characters. — The colony is upright, stiff, or rigid, and 

 consists of one or more stems arising from a common often 

 broadened base. The stems may or may not be coalesced prox- 

 imally in one or more groups for a portion of their length. They 

 divide distally to form numerous branches and twigs. The 

 polyps are not retractile, but may be so strongly contracted as 

 to appear retractile. They are scattered singly, or in little 

 groups, on the branches and lateral and terminal twigs. The 

 tentacles bear on each side a single row of pinnules. The thin 

 canal walls contain a close network of spindle-shaped or rod- 

 shaped spicules whose ends are usually roughened, enlarged, 

 and divided. The spicules of the polyp wall are spindles usually 

 forming 8, more or less, distinct converging double rows in the 

 bases of the tentacles; those of the branch cortex are spindles 

 forming an interlacing felt work over the surface; those of the 

 stem form a thick layer of spindles, club-shaped forms, 4-rayed 

 forms, and double stars, the last predominating toward the base. 

 The tentacles contain numerous spicules which may be of three 

 types, curved or rod-shaped forms, finely sculptured flattened 

 sclerites, or slender, irregularly branched, rod-shaped spicules. 

 The walls of the stomodseum contain small, sculptured or un- 

 sculptured, rod-shaped or flattened, irregularly branched spic- 

 ules, usualjv having two zones of projection and often showing 

 bifurcatio ; ' one or both ends. 



Lemnaf SC3, ^ e l it will be seen differs from Lemnalia as thus 

 diagnos^ a . "^ ^t the tentacles contain very few spicules, in 

 that th/ 560 ™ 011111 ^- im contains no spicules, and in that there is 

 a doub 3 ?. 9t)\ s / r, u C1 P^nnules along each side of the tentacles. Two 

 other characters which may prove to be specific rather than 

 generic in value are the presence in the mid line of the outer 

 surface of each tentacle of a longitudinal band of muscle fibers 

 and the presence in the ectoderm of Lcmnalioidcs of little 

 batteries of nematocysts which I have as yet been unable to 

 find in any species of Lemnalia. 



Lcmnalioides differs from Paralemnalia most distinctly in its 

 softer consistency, in its more treelike colony form, in that 



