THE FORMATION OF GERM LAYERS IN 

 .VI IMA BERMI DENSIS \ l.RR. 



I.HWIS R. CARV. 

 -IVI,K-UY. 



While .it the Bermuda BioloJ, .il st.uion <luriii^ ilu- -ninmer 



<if i ',0. i I attempted to secure ma it -rial for a -tndy of the de\ elop- 



menl 1. 1' Aitinin bermuc \'.-rrill. a \i\iparoii- artinian that 



i- almmlant 1 ii tide mark- in the -haded lime-tone caverns 



aloni; tin- shon !" the -mailer inland-. Sim e tin- material 



.<(! in l.c lacking in tin- t-arlic- in tin- K-\ (! ipim-nt , 



hat tin- i iiiii]ili-ii- finlir\ili >^\ i"iill nut In- \\nrki-il <>ut. I 



lia\c tlimi^ht it ail\i-aM<- tu puMi>h tin- fi >\\< >\\ ii. . ant as 



it covers one of 1 !.-il p. iim- in tin- cU-\r| ( .|nnrnt 1.1' 



anl Im/naii-. 



Vccordii McMurrich 1891 , the onl) \\cll aiitlu-nn< att-d 



1 < nirrata in uhidi tin- -m|mlrnn aii-c^ h\- 



lini are lii ami /' \>\\i Sr\ ph< >nic- 



liuinlaii '111111 ill" the I'lirmatiiin \ the nnlo- 



in . '. lii- -.11 tin- lia-i- i !" hi- i.u n 



observations "ii .\' . l\"\\alr\- 



>ki-' J (187 ! the ; \\ hirli 



in tin- "li-inal \\.i- i; :Mc alike I' MiMnrrich 



and m\-ell". lie ili-ini e- in ihe -aim- in. inner -a\in^ that il \\a- 

 pn 'I'.iliK an ei n .r in inter|irelal i- .n. 



Appellot I iidoderill |c ifllial i< Ml ill \\\i> 



Species "t ai-tinian-: / and .\<tini<i 

 (K/Huni. His observations on the latter species confirm the pin- 



it ni <>l Mi M nrrirh, iianieK , that there \\a^ im true invagination. 



In tin MII the other hand, he de-erilie- ami 



li^nre- a true imagination, \\hich from hi- figure- nuild \\<>\ In- 

 con-ideied a> an error of interpretation, -inn he \\orked \\ith 



-erial sections. 



Kanroi [907 ha- de-rrilied a tnu- although rather imu-iial 

 t\[>e of imagination in the drvelopmrnt of .^(i^irlia parasitica 

 and Ailtinisia jxilliatd. 



339 



