The Anatomy of Chlamydoselachus 



421 



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Text-figure 77- '~' 



The fourth gill-opening on the right side of a specimen of Chlamydoselachus anguineus, with the 

 gills spread apart to display the gill-filaments and branchial rays. The uppermost side of the 



figure is dorsal, the right side anterior. 

 After Carman, 1885.2, Plate V. 



Text-figure 78. 

 Radial section (x4) of a gill of Chlamydoselachus, partly diagrammatic. The Hnes extending across 

 each filament indicate the sites of attachment of the lamellae on one surface of the filament. The 

 number of lamellae shown is approximately the actual number found in sections through the ventral 



portion of the gill of the first branchial arch on the right side of Specimen No. I. 

 ad.m., adductor branchialis muscle; a.f., anterior filament; af.br.a., afferent branchial artery; c, cartilage of the gill-arch; 

 cm., superficial constrictor muscle of the gill-flap, continuous with the thinner interbranchial muscle of the gill-septum; 

 ef.br.a., efferent branchial arteriole; n., nerve; p.f., posterior filament; v., vein, presumably draining the small blood vessels 



of the gill-septum. 

 Based on drawings of serial sections from two specimens in the American Museum of Natural History. 



