684 



ZOOLOGY 



SECT. 



FIG. 591. Aspergillum. 



(After Sowerby.) 



FIG. 595. Mytilus edulis, attached by byssus (By.) 

 to a piece of wood. F, foot ; S, exhalant siphon. 

 (From the Cambridge Natural History.) 



9 



pap 



FIG. 506. Adult specimen of Nucula delphinodonta, represented as seen from the right 

 side. Reconstructed to show internal organs. Fully grown specimens are 4 mm. Ions. 

 aa. anterior adductor muscle ; bg. byssal gland ; eg. cerebral ganglion ; /. foot ; g. "ill ; 

 h. heart; int. intestine ; Ip. labial palp; ces. oesophagus; ol. statocyst ; pa. posterior ad- 

 ductor muscle ; pap. palp-appendage ; py. pedal ganglion ; sto. stomach ; rg. visceral gan- 

 glion. (After Drew.) 



