LATERAL CANAL SYSTEM OF SELACHIANS 



65 



infraorbital canals do not appear to anastomose with the su- 

 praorbitals as they do in Mustelus, and there are other differences 

 in the supraorbitals and hyoniandibulars which I have not 

 examined wdth sufficient care to describe in detail. 



n.O. Dtln. Dcr.O. 



S.Orh 



Fig. 76 Surface view of 72 mm. em])ryo. Squalus. X l|. 



Fig. 77 Transverse section of lateral canal, anterior region of body. Squalus, 

 72 mm. X 360. 



Fig. 78 A section similar to figure 77, but farther caudad. Note the small 

 lumen, and also that the canal wall is still attached to the ectoderm. Squalus. 

 X 360. 



THE JOURNAL OF COMPARAIIVE NEXTHOLOGy, VOL. 28, NO. 1 



