56 



MRS. LEONORA -T. WILSMORE ON SOME 



Lettering. 



e.g. 

 d.cap. 

 d.sph. 



ect. 



ect.m. 



end. 



end.m. 



gr. 



gs. 



imper.mes. 



m 



m.\, m. 2, 



Acontium. 



Cuticle. 



Circular groove of capitulum. 



Distal portion of capitulum. 



Distal portion of sphincter 



muscle. 

 Ectoderm. 

 Ectoderm muscle. 

 Endoderm. 

 Endoderm muscle. 

 Groove. 

 Gonads. 



Imperfect mesentery. 

 Mesoglcea. 

 Different lenfyths of ectodermal 



muscle in tentacles. 

 Bulb or head of long: retractor 



muscle of mesentery. 

 Mesentery. 



»ie.\ me."^, I Mesenteries of lst^2nd, and 3rd 

 me.^. \ cycle. 



m.f. Mesenteric filament. 



TO.^;, Muscle-pad of long retractor 



muscle of mesentery. 

 mu. Muscle. 

 onuc. Mucus. 

 nem. Nematocysts. 

 oes. CEsophagus. 

 p. Physa. 

 p.h.m. Parieto-basilar muscle. 

 p.m. Parieto muscle. 

 po. Pore. 



s. Scapus. 

 sd. Grains of sand. 

 si. Siphonoglyphe. 

 sph. Sphincter. 



su. Sucker. 

 tent, tentacle. 



EXPLANATION OF THE PLATES. 



Fig. 1. 

 2, 

 3. 

 4. 



Plate 4. 



Perichia hilU. X 2. 



Peachia hilli. Larval form. X 2. 



Peachia hilli. Transverse section through oesophageal region. X 12. 



Peachia hill'. Longitudinal section thi-ough capitular region, x 14. 



This section passes through the oesophagus and shows the thick wall of the 



siphonoglyphe on the right-hand side. 

 Peachia hilli. J^ongitudinal section through the lower end of the scapus, showing 



strono- development of endodermal muscle, x 68. 

 Peachia hilli. Longitudinal section through part of physa. showing five pores. 



X 188. 

 Peachia hilli. Transverse section through lower scapus near physa. X 12. 

 Peachia hilli. Perfect mesentery, x 52. 



Fig. 



9. 

 9a. 

 10. 



11. 



Plate 5. 



Phellia broioni. End view, x 3. 

 Phellia hroimi. Side view. X 3. 

 Phellia broivni. Longitudinal hand-cut section through capitular region. The 



sand-grains are removed from the lower half, leaving the rough deeply pitted 



surface exposed. Drawn under dissecting microscope. 

 Phellia hrowni. Longitudinal section through sphincter. X 188. 



In upper part the endodermal muscle is figured attached to a mesentery, in 



the lower part it is represented lined by the endoderm of the column-wall, 



