184 



INVERTEBKATE AXIMALS. 



gullet, sti.inach, intestine, and anus (fig. 129), with the exception 

 uf a few forms in which the intestine ends blindly. In some the 



/ 



Fig. 12fi.~riiaf;i-arii uf tljc struc-tiire of a tyiiifal Mollusc (the Common Wlielk). / The 

 iiiuscitlar " A.ot " ; op Tlie o]>»aciiliiiii ; t One of the tentacles, or feelers, with an 

 eye at its base; j) The fti-olaiseis, reti'acted, with the mouth at its extremity; oe 

 Gullet; g Stomach; i Intestine, teniiinatinr^ in the anus; nn Salivary glands; 

 I The liver an<l the <ivary; /(. Tlie heart; ^e The yill, contained in a hood of the 

 mantle; s lircalliiri^'-l iilie or si|ilion : r and c The main m-rve i;anL;lia, the cme 

 aljiive tlic (jullet l.eiriK Die cerelnal fan-lia, and tlie one liehjw the gullet being 

 the C(,'nibined pedal and ]km ieto-splunehnic .yanglia. 



month is snnidnided liy ciliated tentacles {Pof//:oa,, fig. 132); in 

 others it Ls funiished with two long ciliated arms (Brac/iiopoda, fig. 



Y\i;. V.n.-Trri'hmtnJa rllrrii. 1. Sho\sing I lie ciliated " arms " ; ■:. Snowing the 

 shell with its lo.,i, for the suiqiort of the arms. (.Mter Woodivaut) 



l^iii); in the Ijivalves {fjiiiiirllihrdiirliiiilu), it is mostl}' furnished 

 wilh fiiiir uienibrandus processes or " palpi " (fig. 139, p) ; in others 



