31 



Alien. 



fig. 3, cross section, nat. size and enlargement, to show anatomy ; 

 fig. 3a, section lengthwise, to show central cavity and cross par- 

 titions (septa) ; enter walls mostly worn away. (Other figures 

 omitted.) Braintree formation. M. C. 



A, mmganensis. See Etlimopliyllnni minganense. J/. C. 



A. profundus. See Btlmiopliylluni profundum. M. C. 



Arcli^opliyton newberryaiium. Britton. Annals of the 



Li CtUl 









' /. y ','^f-' 



'A 'r' 







A/. L BrctibTT: ^ '^:<^;iL^^*^ -^-^>''7\ ^7^7 . a/, y. a cad, ScJV.4. I ?n. 



N. Y. Academy of Science, Vol. 4, No. 4 ; a figure, nataral -size^ 

 of probably the oldest known sea-weed (algoid), fonnd in the 



