Brachiopoda, 



57 



The viscera lie near the hinder or peduncular end of the shell, GALLERY 



and the mouth is directed towards the forepart or opening of j-^gt side. 



Wall-cases 

 10 & 11, 

 Table- 



86-88. 



Fig. 101. — Spirifer siriatus, Sby. Carboniferous Limestone. 

 An example of tbe spire-bearing Telotremata. 

 The sbell is seen from the side of the brachial valve, and portions of that valve 

 are broken away, exposing the spires that support the arms of the lopho- 

 phore. Between the umbones of the peduncular and brachial valves is seen 

 the delthyrium, partly filled in by the deltidial plates that have met and 

 fmed above the foramen into a single deltidiura. 



Fig. 102. — Magellania Jlavescens, Lami,, sp. Recent seas, Australia. 

 An example of the loop -bearing Telotremata. 

 A. — Interior of peduncle valve. /, foramen for peduncle, below which are seen 

 the two deltidial plates ; t, teeth of hinge ; a, b, c, muscle -scars ; 

 b', scar of peduncular attachment. 



B. — Interior of brachial valve, c, c', cardinal process for attachment of muscles ; 

 b, hinge-plate, supporting cardinal process and prolonged below into p, 

 the median septum ; s, sockets for the teeth of the peduncle valve ; /, loop, 

 supporting lophophore ; a, muscle-scars. 



the shell. The mouth is surrounded hy a somewhat horseshoe- 

 shaped disc ; this bears tentacles that are furnished with minute, 

 rapidly-moving processes known as "cilia," which drive towards 



