PLATE VIU. 



The lettering is the sann; in all tliu Hiruves. 



a Acontia. 



b Mesenteric filaments. 



c Stomata in the septa. 

 e ' Perioral stomata. 

 c- Marginal stomata. 

 cu Cuticle. 



d Glandular streaks of the mesen- 

 teric filaments. 



« Ciliated streaks of the mesenteric 

 filaments. 

 ek Ectoderm. 

 en, Endoderm. 



g Reproductive organs. 



h .Septa, rh Directive septa. 



t Oral disk. 



k Wall. 

 I Pedal disk. 

 TO Muscles. 

 mm Mesodennal muscles. 

 iiil Longitudinal muscles of the septa. 

 mP Retractor. 

 mp Parietobasilar muscle. 

 mt Transverse muscles, 

 mr Radial muscles of the oral disk 

 and longitudinal muscles of the 

 tentacles 

 nis Circular muscle of the wall. 

 me Mesoderm. 

 n Urticating cells. 

 Ovicells. 



;) Filamental apparatus of the ovicells. 

 p^ Process of the ovicell. 

 p'^ Apical set of epitlielial cells. 

 r Marginal spherules. 

 rli Directive septa, 

 .5 (Esophagus. 

 so Openings of the oesophagus into 



the radial chambers. 

 ST G^sophageal grooves, 

 s; Lappets of the cesophagus, 

 t Tentacles and the openings liomolo- 

 gous with them. 

 1 1 Principal tentacles. 

 t - Accessory tentacles. 

 V Openings of the pedal disk. 



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



A 

 C 



D 

 F 



J 



A mth unscrewed front Icus (unscr. A) magnifies with Oc. 1 : 30 times ; 



Fig. 1. Transverse section through the wall of Phellia 2>ectinata. D, Oc. 2. 



Fig. 2. Transverse section through the directive septa of Phellia pectinata below the 

 oesophagus. A, Oc. 2. 



Fig. 3. Part of a transverse section through the longitudinal muscular swelling 

 (retractor) of a septum of Tealia hunodiformis., C, Oc. 2. 



Fig. 4. Longitudinal section through the wall of Tealia hunodiformis with endo- 

 dermal saccules. A, Oc. 2. 



Fig. 5. Part of a transverse section through the oesophagus, the wall, the directive 

 septa, and the adjoining septa of Tealia hunodiformis. d}, Oc. 1. 



Fig. 6. Transverse section through the wall of Cerens spinosus. Fig. a, a portion 

 of the cuticule, drawn out like a tube. D, Oc. 2. 



Figs. 7,8. Portions of the circular muscle of Tealidium cingidatum, taken at different 

 points. J, Oc. 2. 



Fig. 9. Endodermal muscles of the oral disk of Comactis flagellifera. D, Oc. 2. 



Fig. 10. Portion of a transverse section through the circular muscle of Phellia 

 23ectinata. D, Oc. L 



