EXPLANATION To 1'LATK XXTII. 



. I. SertulareUa Jiliformis (Allmanj. Hruneh with gonangium, imm Allman's type specimen (enlarged). 



1', :!. !<i-i-l<tli<ri-ll<ijili(<iriiii*. II \ ' In >t her;.', frnin same spiTiincn i v'r;itly ciilar^ud i. 



4. \-iiiilin-illii tjiiiiilrijiilit Ilarthiuli. I'urt of Allman's type of &r<itZaria i/iKnlriili'im Allman ( cnhirui''! I. 



">. /S'i ///< i r<7/ i/nuili-ili'/n. Thtvc liyclviitliccM' from sann- ^in-ciiiii'ii (greatly enlargi-il). 



ii, 7. ,S'i i-liilin-illii i/iiiiili-(liilii. IIyilrntlnr;i' from same specimen, slmwinfr teeth ami opereula (irreatly en 



.^. *i rf/ifri I't'llti tneridionalis Nutting. 1'art of lirnnrh \\~itli gonangium (''iilar'je'l i. 



:l. ,S('/V/iici I In in, i' i iln mi 1 1 '.-'. Single liyilrotliei-a. -liowiii'_ r teeth and open-ulum I en lapsed i. 



I'll I 



