408 



MARINE INVERTEBRATES 



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Anatomy of a pelecypod, Anodonta cygnea. The animal with most of the left mantle lobe removed. 

 a, excretory opening; a. ad., anterior adductor muscle; a. r., anterior retractor muscle; au., left 

 auricle; d.p.a., dorsal pallial aperture; ex. sph., exhalant siphon; ft., foot; in.sph., inhalant 

 siphon ; kd., kidney ; Z. ext. gl., left external gill ; 1. ext. pip., left external lahial palp ; I. int. gl., left 

 internal gill ; I. int. pip., left internal labial palp ; I. m., cut edge of left mantle lobe ; mth., mouth ; 

 p. ad., posterior adductor muscle; pc., pericardium; p. r., posterior retractor muscle; prc., pro- 

 tractor muscle ; ret., rectum ; r. m., right mantle lobe ; v, ventricle ; v. m., visceral mass. 



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Anatomy of a pelecypod, Anodonta cygnea. Dissection from the left side, a, excretory opening; 

 a. ad., anterior adductor muscle; a.ao., anterior aorta; a.v.ap.. auriculo-ventricular aperture; bl., 

 urinary bladder; r. pi. gn., rerebropleural ganglion ; d. d., duct of digestive gland; d. gl., digestive 

 gland; d.p.a., dorsal pallial aperture; ey. stph., exhalant siphon, ft., foot; g.ap., genital aperture 

 gon., gonad ; gul., gullet : i. 1. j., interlamellar junction ; in. sph,., inhalant siphon ; int., intestine : kd. 

 kidney; m, mantle; mth., mouth; p. no., posterior aorta: p. ad., posterior adductor muscle; pc., 

 pericardium; pd. gn., pedal ganglion; r.ap., renal aperture ; r. au., right auricle: ret., rectum; 

 r.p. a., reno-pericardial aperture ; St., stomach ; ty., typhlosole ; v., ventricle ; v. gn., visceral ganglion ; 

 p. t, water-tabes. 



