ON PARAWRIGHTIA ROBUSTA. 207 



gonophore. The umbrella cavity (u. c.) of the gonophore has an opening 

 (o. u.). Two planultB nearly ready to escape are shown {PL), ect. 

 Ectodermal epithelium lining spadix and eetotheca. 



Fig. 4. — x 60. Transverse section of a young female gonophore. 

 Alternating with the endodermal canals are seen four spaces {s}).), 

 which are ectodermal canals opening into umbrella-cavity. 



Fig. 5. — x 60. Longitudinal section through a male gonophore. 

 The umbrella-ca\'ity («. c.) is closed, although the position of an opening 

 is indicated at n. e. ep. is the ectodermal epithelium lining spadix and 

 eetotheca. 



Fig. 6. — x 750 diameters. Small piece of transverse section of male 

 gonophore with capsuled Schizophyte in ectodermal canal and in 

 chaimels (ch.) in the generative epithelium. 



Fig. 7. — X 1300 diameters. (/) Youngest stage; (2) and (5) show the 

 beginning of the formation of a capsule ; {4) shows the fission of central 

 body and of capsule. 



Fig. 8. — x 1300 diameters. Older stages. (2) (i) and (5) are 

 examples of budding ; (6) central body {d. h.) dividing ; (7) several 

 central bodies are present, and dense outer capsular layer ; in (8) (9) {10) 

 the laminated structure is replaced by a radiating structure, except for 

 the outer layer (o. en.). Specimens were taken from a male gonophore. 

 In {9) and {10) the central body has divided considerably {d. b.). 



Fig. 9. — x 1000 diameters. Specimen taken from a female gono- 

 phore, showing central bodies {c. b.) ; capsule with outer compact 

 envelope, and bodies (s. b.) embedded in the substance of the capsule. 



Fig. 10. — X 1000. Specimen from female gonoj)hore with central 

 bodies (c. b.), and dividing bodies {d. b.). Two outer envelopes or 

 sheaths to the capsule are seen. The innermost layer {i. I.) is less 

 pellucid than the other layers of the capsule. 



Fig. 11. — X 1000 diameters. Lobed specimen with several centres 

 of lamination. At d. b. the central bodies are splitting up preparatory 

 to the formation of spores. 



Fig. 12.— X 1000. Older stage with dividing bodies ((/. b.) and the 

 contracting inner capsule {I. sh.) with cavity (e. cy.). The two outer 

 envelopes, en^. and en^. are showTi. 



Fig. 13. — X 600. Capsule showing spores {spo.) and cavity (c cy.). 



Fig. 14. — x 1500. Specimen with disintegi-ating inner capsule {In. sh.) 

 and spores {spo.). 



Fig. 15.— X 2000. Spores. 



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