TliJi: EARTUWOliM 



179 



long stalk and a "head" or body proper; and the Ect'o- 

 procta (Figs. 109, 170), usually without such a stalk. The 



-:^n^ 



dm' 



Fig. 171. — .4, entire shell of the brachiopod Magellania from dorsal aspect ; 

 B, from left side ; C, interior of ventral valve ; D, of dorsal valve, ad.-m, 

 impressions of closing muscle; b, beak of shell; c.fj, "cardinal" process 

 of shell ; d, plate closing the ventral shell ; d.m, impression of muscles that 

 open the valves ; d.v, dorsal valve ; /, hole through which stalk passes to at- 

 tach shell to the roek ; p.m, impression made by muscle that protrudes the 

 stalk ; s, socket for tooth {() of ventral valve ; s.l, loop to hold tentacles ; 

 sp, partition or septum ; v.v, ventral valve. From Parker and Haswell. 



Ectoprocta are the commoner. The marine species form lace- 

 like mats on seaweed, or stand up as branching, bushy colonies 



