VIII 



BRACHIOPODA 



185 



and Clams belong. The shell (Fig. 98) consists of two pieces or 

 halves one dorsal (d.v.), the other ventral (v.v.), and the animal is 



adm 



FIG. 98. Magellania flavescens. A, the entire shell from the dorsal aspect ; B, 

 from the right side ; C, interior of ventral valve ; D, of dorsal valve ; ad. in. ad- 

 ductor impressions ; b. beak ; c. p. cardinal process ; d. deltidmm ; d. m. divari- 

 cator impressions ; d. v. dorsal valve ; /. foramen ; /. m. protractor impressions ; 

 .v. tooth-socket ; s. 1. shelly loop ; sp. septum ; t. tooth ; v. v. ventral valve. 

 (After Davidson.) 



attached by a horny stalk or peduncle (Fig. 99, pd.) which passes 

 through an aperture (/) in a process, the beak (b.), of the ventral valve. 

 In the natural state the peduncle is attached to a rock or other support, 



