PT.ATE V. 



Fig. 7. — Male, viewfd from the ilm-sal .>i\ii'face. The liuod, mantle, and liody wall have been cut open in the median 

 line in order to show tlie moutli parts, tlie Iwemoeiel, and tlie eceloni, with their containeil orirans. 

 Ao, aorta. 

 ASp, antispadix. 

 B, Inieeal mass. 



B;\1, bufcal membrane, ent open dorsally to show tlie tips of llic jaws. 

 BW, wall of the po.sterior portion of the body. 

 CK, erescentie ridge ujion the po.sterior face of tlie hood. 

 DBR, dorsal buccal retractor nuiscle. 



DM, dorsal portion of the mantle cut ojien and folded down. 

 DT, di<iital tentacles. 

 GL, genital ligament. 

 Ho, hood. 



L, L, lobes of the liver, covered by the lucinoco'li<' mendirane. 

 Oe, oesophagus, lyinji in the h.'emoco'l. 

 - S, siphuncle. 

 SLL, superior labia! lobe. 

 Sp, .spadix. 

 St, stomach. 

 T, testis. 

 V.1, upper jaw. 



VM, ventral portion of mantle. 



X, jVHiction of the h;emoc(elic membrane and boily wall along the line of the dorsal aponeurcjtic band. 

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