

lyplilosole of the in 

 ! articulation, or pi' 



., Sllrl! ^ 



; ■ I oi il:. . iiid of Desh, 

 ' I -il pal'.ial I'jltl. 



lit renal duct^gairecj 



(;iii.' 



Gland of Deshayes in the 

 (Discovered and'caCPi'tJ 

 1908.} 

 Gaslro-intcsrlnal typhloR 

 Right genital orifice. 

 Gastric shield. Onil7-;r-sri 

 right edge shows in figii 

 Gastric typhlosolc. 

 Intestine. The arguvis-ptiilv 

 rinus. 



branchial cavity. Ti 

 'S the direitiwi of th 

 I' nt of the^'iscera 

 ■I- tubularj-sprnf 

 . ■^ystenfe 



L, ihe \isceral mass, nearly 



I'lse structures lying in or 



: , ti ' the reader's left. The left 



TiKiire 78, 1. Animals killed in 



i-r^ wings have been made with 



R)ud cm 1. Anierior aspect. 



^nw-nt of the shell. 



'■T.^l canal. These are lateral, anterior 

 _iL«isions of tl 

 , communi( 

 .iijchial cavir- , r 

 N (see fig. "6 



rinchial cav- 

 rhe infra- 

 ih>' anterior 



- viduct. 

 jjhagus. 



r\'. In male specimens the testes art- 

 ^iunkir in extent and relations (see 

 6g. 79, 2-4). 

 -4i-y-k>f|is. 



I'osterior adductor muscle of the valves. 

 ■ -u.^^.^.^ ior ;KTf ' 1.. I ,,.1. -1,1.- viih the 

 o.sterior a ' -. 



hi^mh rur 



'*■' :rtery, a cuiilinualioii ui ihc pos- 

 aorta after it has looped over 

 a posterior adductor muscle. 

 7ttTirdium. Posteriorh- it bifurcates, 



j'uslerior liver. 

 - i'.iiSlgrior, pyloric region of the stomach. 

 Right renal orifice. 

 Flight reno-pericaidial orifice. 



tyni, separating regions that are prob- 

 homologous with the pedal and 



,l(!ll^ -Ml ■.,, - 



ranch r)f the 



-.1 ptuni 

 " "•trty 



I he arrow indi- 

 i i he flow of water. 



-^.rfil till. ■' :' ;■'' 1 



-hows ihi I I - .' 



■.. -,Th. 



ii; of the heart. The arrows at its 

 lor end indicate the direction of 

 'W of blood. 

 • articulation, or pivotal knob, of 

 ^hell. 

 , ;t;(!eral ganglia. 



/en4ral hepatic or', '' "t 



"tlftse. as showi, 

 . en^jral liver. 



