PLATE LXV. 



Chlamydoselache anguinea (page 3). 



Fig. 1. External view of the abdominal apertures in a normally developed male, cl, 

 cloaca ; v, vent ; ug, urogenital openings ; po, porus abdominalis. 



Fig. 2. External view of the abdominal apertures in a male, in which the duets of the 

 right side are less developed than those of the left. 



Fig. 3. Side view of the vasa deferentia of the same specimen, po, porus abdominalis ; 

 vd, left, and vd', right vas deferens ; u, urinary bladder ; ug, right, and 

 ug', left urogenital opening ; r, kidney ; i, rectum opened ; gl, gland. 



Fig. 4. Lower part of the left vas deferens, longitudinally slit open to show the annular 

 folds. 



Fig. 5. Valvular portion of the intestine slit open to show the spiral valve and the thick 

 muscular wall (m). 



Fig. 6. Transverse section through the middle of the valve. 



Fig. 7. Heart (r, right, and /, left side). 



Fig. 8. Conus arteriosus longitudinally opened to show the arrangement of the valves. 



