RAYS. 
1091 
dated by Jacobson", Retzius 6 , and Leydig c . We have 
observed them above in the Chimsera. In the Rays 
there commonly lie several symmetrical pairs of cap- 
sules (fibrous investments of the basal parts of the 
ampullae and of the nerve twigs supplied to them), 1) at 
the tip of the snout (fig. 308, Ba), 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. Schematic figure of the distribution of the lateral line canals in a Raja , parti} - after Garman 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 — 5, its outward crook on the ventral side of the snout; 5 — 6, canal by which it communicates with the suborbitnl branch; 
7 — 8, course of the suborbital branch on the dorsal side of the head; 8 — 3, 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 11 ; 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-pleural bend; 15 — 16, its 
inward, ventral continuation; 16 — 17, its forward, ventral course side by side with the suborbital branch ; 17 — 18, 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 — -25, posterior dorso-pleural branch 
of the lateral line; 26, lateral line of the trunk and tail; 27, mandibular branch; Ra, rostral ampullae; oa, orbital ampullae; hya, hyoid am- 
pullae; via, mandibular ampullae; po, pit organs; o, mouth; oc, eye; sp, spiracle. 
“ Bull. Sc. Soc. Philom. Sept. 1813. 
b 6fvers. Vet. Akad. Forh. 1845, p. 177, where references are given to the remaining literature on this question. 
c Roche?), Haie, Leipz., 1852, p. 41. 
