THE PLUMULARID.E. 



37 



100 



ORIGIN OF THE MALE SEX CELLS IN THE PLUMULABID2E. 



Fig. 96. Optical section of part of a male cultmy of Mumularia echinulata. After Weismann. blxt, hlastostyh-: <U/<, plug closing mil r 

 gouangium; ect, ectoderm; t-fc. nip of eetnderm over primary testes : fnf, endoderni ; <in<i, ^mian^iinii , tijih, ^Miinphure; <j*t, peduncle of 

 gouophore; h, testes; hi/, liydrantli; hz, *-ctn<l*-rni ]iroceasea; lh t cavity of blastostylc ; /(/'/*, iK-iuatopliore: ^i", origin of bydroi-ladinin; 

 ps, perisan 1 ; *(, stem. 



Fig. 97. A very young male gnnangiuni of A<ilai>ii'nia ^p., viewed with transmitted liulit. hi, liIastOMt\ li- <!(. ectnderni; i>, perisarr <>(' 

 gouangiuni : sp, mass of sperm cells; K}>a, spadix: sjm, spermatozoon. 



Fig. 98. A similar specimen viewed as an opaque nbjert. Lettering is the same. 



Fig. 99. A still younger gonopliore in optical section, c, cavity of blaatostyle; ecf, eritnlrnn , . 'ml riiilmlenii .-.y, atut/lamelle. 



Fig, 100. A mature sporosae showing the nrruiigerm-nt uf sperm cells ill lines radiating from the spadix. 



Fig. 101 . Gonangium of Phtmularia pinna ta t sliowing a gonnplior- passing out of the top. 



Fig. 102. Gonangium of /'. pinnatn with .six guimphnrrs. 



Fig. 103. Cross sec-tiou of bla.stosl\ le of I'lunuiltiriu echinitlata, .-.howing ova in the, cndoderiu. /*, pLTisan- , "i her lettei'ing as in fig. 99. 





