Beepe.] 



( 'arbonifi rous Invertebrah s. 



hm k a- - J* 



53 



Fig :i V Lingula murvhlana ( after Hall and Clarke i, showing the pedicle, which is 

 greatlv developed in this genus: B, Magellan* ftaveicen* (after Schuchert, in Eastmans 

 Trans" „f Zittel | : C, Seminuta argentla; D. Products giganteu* (after Schnchert, in Last- 

 man'- translation of Zittel ) ; E, Derbya robu$ta; F, Produc«tt» «em*retfcuta«u*; a, addnc- 

 ccdiductore; </, spiral brachia ; b$, same as seen in a fossil ; dl t diverging lines ;dW, 

 deltidinm; a,, adductor scar; ca, cardinal area ; cp, cardinal process ; /.foramen; h, fringe 

 on brachia; ft m. hinge line: Ir, ridge diverging from base of cardinal process: ms, mesial 

 im; ht, teeth; s, alimentary canal ; r, month; vm, brachial markings. — 



