EXPLANATION OF THE PLATES. 307 



FIGURE. PAGE. 



T4. Littorina littoralis ^'i (after Soulej'et). Animal removed 

 from its shell, branchial cavity and back laid open, 

 r, rostrum or muzzle ; k, buccal mass ; g, nervous 

 ganglia (.reproductive orifice, on the right side) ; .s, 

 salivary gland; ce, oesophagus; Z, lingvial coil; ■»?, 

 shell-muscle ; 6, branchia or gill ; c, heart ; ?i, aorta; 

 p, stomach ; /", liver ; /?., biliary canal ; ^, intestine ; 

 a, anus ; o, ovary ; d, oviduct ; u^ uterus ; o', ovarian 

 orifice; ^, renal organ ; y, mucus gland, . . .93 



"15. Digestive tube of Mactra stultorum, Linn. A schematic 

 view (after Garner), b, mouth; c, the stylet; e, 

 stomach ; i. intestine ; r*, rectum ; o, ventricle of the 

 heart; o, auricles. . . . . . . .105 



76. Sectionof stomach of Pyrula tuba. (Keferstein.) cb, ali- 



mentary canal ; i, intestine ; u, stomach ; /?,, liver. 93,100 



77. Kidney of a Pulmonate. (Fischer.) a, kidney ; 6, ureter ; 



c, rectum ; d, mantle ; e, pulmonar}^ chamber ; /", great 

 branchial vein ; y, g, branches of the aorta ; i, heart ; 

 I, pericardium opened, . . . . . .103 



Plate 15. 



78. Anatomy of Helix albolabris, Say. (Leidy.) 1. Buccal 



body ; 2, its retractor ; 3, oesophagus ; 4i stomach ; 

 5, intestine ; 6, rectum ; 7, anus ; 5, salivary glands ; 

 0, liver; 10, testicle; 11, epididymis; 13, prostate; 

 IS, penis ; 14, its retractor ; 13, ovary ; 16, oviduct ; 

 17, genital bladder ; 18, pulmonary chamber ; 19, 

 pulmonary vein ; ^(9, heart; 21, renal organ; 22, its 

 duct; 23, anus; 24, cephalic branch of aorta; 25, 

 supra-oesophageal ganglia, . . . . .93 



79. Purpura lapillus, Linn. Respiratory siphon opened to 



show vg, vagina ; a, anus ; gp, purple gland ; br, 

 branchiae ; r', opening of the kidney. (Keferstein, t. 

 87, f. 7 , 107 



80. Conus tulipa. Lam. Male. (After Quoy and Gaimard.) 



h, hepatic lobes ; r, kidney ; t, testicle ; vd, vas 

 deferens ; p, penis ; a, anus ; o, mouth ; o', oral mass ; 

 g, cerebral ganglion ; «, salivary gland ; Z, tongue 

 sheath, 102 



81. Digestivesystem of Patella. (After Cuvier. ) a,mouth; &, 



oral mass ; <i, stomach ; e, intestine, . . 93,101 



82. Digestive tract of Voluta undulata. Lam. (Keferstein.) 



0, mouth ; o', oral mass ; s, salivary glands ; g, cerebral 

 ganglion ; ch, oesophageal appendage ; pv, crop ; v, 

 stomach; a, anus, ..... 100,101 



