EXPLANATION Of THE PLATES. 803 



PIGUKB FAGB. 



82. A lamina of the larger hranchia of Nautilus Pompilius, 



magnified. ; showing its subdivision into the smaller 

 laminre. 9. Cavity of tlie branchial arter}*. 10. 

 Branchial vein. /•. Flesh skin of the branchia. 

 (Owen.) 83 



83. Heart of Octopus vulgaris. Cut open. (Cuvier.) a. 



Aorta, b. Auricle, c. Yalve. d. Network of muscle, 88 



84. Circulatory system of M3'tilus edulis, Linn. (Poll.) 



a. Yentricle ; b. Auricle ; c. Branchial vein ; d. Pedal 

 artery, ......... 90 



85. P^'rula tuba. Lam. Male. aq. Aqueous pore ; p. Penis ; 



7\ Kidney ; S. Respiratory siphon ; P. Foot ; br. 

 Branchiae. (Keferstein), . . . . 6(i, 90 



86. Yertical section of foot of Mactra, showing the aqui- 



ferous system. (Delle-Chiaje), .... 91 



Plate 8. 



87. Venous system of Sepia officinalis. (After Delle-Chiaje.) 



vc. Vena cava ; r. Renal organ; cv. Venous hearts. 88 



88. Arterial system of Sepia officinalis. (After Delle-Chiaje.) 



c, heart ; c', auricle ; &r, branchiffi : ao, great aorta. 88 

 69. Section ofAnodonta, exposing the heart. (After Huxley.) 

 a, mantle ; b, foot ; c, rectum ; /", ventricle ; (/, auricles ; 

 p, pericardium ; o', organ of Bojanus ; g, genital 

 gland ; 7l,^, internal and external branchiae, . 86, 90 



90. Circulation of Paludina vivipara. (After Le3^dig. ) gc, 



cerebral ganglia ; g p, pedal ganglia ; ot, ear ; op, oper- 

 culum ; r, kidney ; vt, uterus ; oo, ovary ; br, bran- 

 chiae ; oc, eye ; c, heart, ..... 83, 88 



91. Circulation of Haliotis tuberculata. (After Milne Ed- 



wards.) br. branchiae; c, heart; a, anus ; o, oral 

 mass ; ao, aorta, ...... 83, 88 



92. Branchiae of Doris, a, tentacles; 6,branchi{B; c, heart. 



(Fischer), 86 



Plate 9. 



93. Digestive system of Octopus octopodia. (Keferstein.) 

 m&, buccal mass; gb^ lower buccal ganglion; s', 

 posterior salivary glands; /i, liver; oe, alimentary 

 canal; d 7i, biliary duct ; i, intestine ; a, anus ; b ^, 

 ink-bag; f/ sp. Splanchnic ganglion ; u, stomach; u', 

 blindsack, 91, 106 



