94 



ANNELIDA 



S. tubularia. Fig. 148 ; n. s. 



S. volutacornis. 

 chlorsema. 



FAMILY IV. SERPULADJE. 



Serpula (Linn.). Body depressed, attenuated 

 behind; segments numerous and close-set; gill- 

 threads many, arranged in two fans. Tube calca- 

 reous, irregularly twisted, cemented to submarine 

 bodies. 



