134 Natural History Bulletin. 



certain secretinor cells, e. sf. those of mucous membranes found 

 in vertebrated animals. 



Fig. 6, PL III, gives a diagrammatic view of a cross sec- 

 tion of a polyp, showing the distribution of the products of 

 the different germinal layers the ectoderm, mesoderm, and 

 endoderm, as explained on page 104. 



EUNICEA MURICATA.i 



Zoanthodeme branching, arborescent, branches without 

 any marked tendency to lie in one plane and more spreading 

 than in Maricea. The zoanthodeme may reach a height of as 

 much as three feet. It is of a light brownish or buffy brown 

 color, has a corneous flexible axis and thick ccenenchyma. 



Calicles exserted, having very much the general arrange- 

 ment of those of branching Madrepores (PI. IV, fig. i). 

 Indeed the zoanthodeme at large resembles that of Madrepora 

 alcicoDiis, for instance, and I at first mistook fresh specimens 

 of this species for a Madrepore^ and found out m}^ mistake 

 when I discovered that they were flexible. 



The calicles are set thickly over the surface of the branches 

 and are obliquely inserted so that their mouths are higher 

 than their bases (PL IV, fig. 6). The mouths of the calicles 

 are bilabiate in a general way, but one lip is usually entire or 

 nearl}- so, while the other is divided into several lobes. The 

 longitudinal axis of the calicle mouth is, of course, between the 

 lips, and the asymmetrical lips are capable of being closed 

 tightly over the retracted polyp. The lower lip is usuall}^ the 

 entire one and is ventral in relation to the polyp. It will 

 thus be seen that while the lips are asymmetrical in relation 

 to each other, they are really indicative of a tendency toward 

 bilaterality on the part of the polyps. 



1 Identified from description in Milne Edward's " Histoire Naturelle des 

 Coralliaires," which came to hand while the preceding pages were in press. 

 This identification is also confirmed by the description in Kent's work, "On 

 the Calcareous Spicula of the GorgonacijE," p. 86. 



2 Dana in his "Zoophytes"' calls a closely related species Gorgonia 

 madrrfora. 



