HAYS. 



10',) 1 



(l;it('(l 1)V Jacohson", liETZirs'', and Lkydig'". We have 

 ol)sor\e(l them aliove in the Chima'ra. In llic liays 

 tliore coinnuinl}- lie several symmetrifal pairs of cap- 

 sules (fibrous iiivcstineiits of the basal parts of the 



ampulla' uini of the iicr\(! t\vi;[is supplied to them), 1) at 

 the (ip of tlie snout (lig. 308, lia), 2) further back 

 on each side of the base of the rostral cartilage, on 

 the ventral side before the nasal capsules, 3) on the 



Fig. 308. Sclic-matic figure of the distribution of tlie lateral line eanals in a Jiuja, partly after (i.^njUN and Ewart. Right half of the 



body; to the right the dorsal side, to the left the ventral. 

 1 — 2, course of the supraorbital branch on the forehead and the dorsal side of the snout; 2 — 3, its backward continuation on the ventral side 

 of the snout; 3 — 4 — 6, its outward crook on the ventral side of the snout; J — 6^, canal by which it eoniinunicates with the suborbital branch; 

 7 — 8, course of the suborbital branch on the dorsal side of the head; 8 — 9, its backward continuation on the ventral side of the head; 9 — 10, 

 its inward ramification, which at 10 gives out a transverse canal inwards to join the suborbital branch of the other (left) half of the body, 

 and then advances to its termination at the tip of the snout, at //; 12 — 13, backward course of the opercular (hyomandibular) branch on 

 the ventral side of the head and pectoral fin, in a curve outside the gill-openings (apbr); 13 — 14 — 15, its ventro-pleurnl bend; 13 — 76", its 

 inward, ventral continuation; 16 — 17, its forward, ventral course side by side with the suborbital branch; 17 — l(!f, its backward course on the 

 dorsal side of the head; 18 — 19, its dorso-pleural curve, which at 19 joins the anterior pleural branch of the lateral line; 20 — 26, the lateral 

 line proper; 21, transverse occipital branch; 22 — 23, anterior dorso-pleural branch of the lateral line; 24 — 2.'5, posterior dorso-pleural branch 

 of the lateral line; 26, lateral line of the trunk and tail; 27, mandibular branch; Ra, rostral ampulla?; oa, orbital ampulla;; hya, hyoid am- 

 puUaj; ma, mandibular ampullie; jjn, pit organs; o, mouth; oc, eye; sp, spiracle. 



Bull. Sc. Soc. Philom. Sept. 1813. 



Ofvers. Vet. iVkad. Forh. 184.5, p. 177, where references ar 



Rochen, Haie, Leipz., 1852, p. 41. 



eniainiiig literature on this question. 



