a Acontia. 



b Mesenturic filaments. 



c Stoiu.'ita ill the septa, 

 c ' Perioral stouiata. . 

 c- Marginal stuinata. 



Glandular streaks of the mesen- 

 teric filaments. 

 c Ciliated streaks of the mesenteric 

 filaments. 

 ek Ectoderm. 

 en Kndoderm. 

 ;/ Ill-productive organs. 

 h Si'pta. rh Directive septa. 

 i Oral disk. 



PLATE XIV; 



The lettering is the same in all the figures. 



k Wall. 

 I Pedal disk. 

 m Muscles. 

 mm Mesodermal muscles. 

 ml Longitudinal muscles of the septa. 

 7nl^ Ketractor. 

 vip Parietobasilar muscle. 

 ml Transverse muscles. 

 mr Kadial muscles of the oral disk 

 and longitudinal muscles of the 

 tentacles 

 7>is Circular muscle of the wall. 

 me Mesoderm. 

 n Urticating cells. 

 Ovicells. 



/) Filamental apparatus of the oviri'lls. 

 7)' Process of the ovicel I. 

 p'^ Apical set of epithelial cells, 

 r Marginal spherules. 

 yk Uireetive isejita. 

 s (Esophagus. 

 so Openings of the njsophagus into 



the radial chambers. 

 sr CEsophageal grooves. 

 s: Lajipets of the (esophagus. 

 t Tentacles and the openings homolo- 

 gous with them. 

 f^ Principal tentacles. 

 t'^ Accessory tentacles. 

 V Openings of the pedal ilisk. 



All statements given as to .nagnifying powers have reference to Zeiss's system. The magnifying powers amount to 



A 

 C 



D 

 F 

 J 



A with unscrewed front lens (unser. A) magnifies with Oc. 1 : 30 times; with Oc. 2 : 40 times. 



Zoanthus, sp. ? (figs. 1-4 and G). 



Fig. 1. Longitudinal section througli tlio upper end of the wall and tlie circular 

 muscle running in it. Unscr. A, Oc. 2. 



Fig. 2. Transverse section through the wall, esophagus, macrosepta and microsepta. 

 A, Oc. 2. 



Fig. 3. Transverse section through an individual of a Zoantlius colony. The figure 

 is composite, the left-hand half representing a transverse section on a level with t\\c 

 oesophagus, the right-hand half a transverse section situated rather further down. 

 a\ Oc. 2. 



Fig. 4. Part of a transverse section througli the wall. D, Oc. 2. 



Fig. G. Transverse section through a small individual of a Zoantlms colony, passing 

 through the oesophagus. a\ Oc. 2. 



Epizoantlins 2^cirasiticiis (fig. 5). 



Fig. 5. Part of a transverse section through the wall of Epizoanthus parasiticus. 

 D, Ocr2. 



Liponema viuJtiporum (fig. 7). 



Fig. 7. j\Iarginal portion of the oral disk oi Liponema imdtiponim ; twice the natural 

 size. 



Sphenopus arenaccus (fig. 8). 



Fig. 8. Transverse section through the wall of Sphenopus arenaceus. D, Oc. 2. 



