CB Cuticula. 

 ee Ectoderm. 

 fn Endodenn. 



g Generative organs, 



h Mesenteries. 

 im Intermediary layer. 

 ■m Muscle-fibres. 



PLATE II. 



The lettering is the same in all the figures. 



me Mesogloaa. 

 ms' Upper circular muscle. 

 ms' Lower circular muscle. 



Ova. 



r Marginal spherules. 

 sr Siphonoglyphe (cesophageal groove). 



t Tentacles. 



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



Fig. 1. Portion of the circular muscle of Hormathia delicatula. D, Oc. 2, somewhat 

 iiminished. 



Fig. 2. llyanthopsis longijilis ; musculature of the oral disc. 7i8j Oc. 1. 



Fig. 3. Hormathia delicatula ; musculature of the oral disc. D, Oc. 2. 



Fig. 4. Circular muscle and marginal spherules of Liponema multiporuTn. A, Oc. 1. 



Fig. 5. Muscle-pennon of Halcampja kerguelensis. A, Oc. 2. 



Fig. 6. Dysactis crassicornis ; transverse section through a tentacle, a', Oc. 2. 



Fig. 7. Portion of the tentacle represented in fig. 6, more strongly magnified. 

 A, Oc. 1. 



Fig. 8. Phellia spinifera ; transverse section through the musculature of the oral 

 disc. E, Oc. 2. 



Fig. 9. The same. 



