VII 



MOLLUSGA— RESPIRATORY ORGANS 



95 



Fig. 90.— Portions of transverse sections of tlie branchial lamellae of Anodonta (after Peck). 

 A, Outer ; B, inner lamella. In each leaf the cross sections of both lamellje are seen, and also the 

 interfoliar as well as the interfilamentar junctions. C, A part of B much magnified, ol, Outer ; il, 

 inner lamella of the same leaf; v, blood-vessels ; /, the separate filaments of which the lamellfe 

 consist; lac, lacunar tissue; ch, supporting tissue of the filaments, with firmer supporting 

 rods, chr. 



Fio. 91. — Portion of the ascending lamella of the outer branchial leaf of Anodonta, 

 diagrammatic (after Peck). /, The separate filaments, connected by interfilamentar junctions ; 

 trf, connective tissue of the latter ; v, blood-vessels ; ilj, interlamellar junctions ; the perforations 

 in the lamella (of a darker shade) are the spaces remaining between the filaments and their 

 junctions, through which the water needed for respiration can flow. 



