DISTRIBUTION OF LYMPHATICS IN SCORP/ENICIITIIYS 49 



in a sinus that empties into the caudal vein (veine cardinale). 

 Upon reaching the end of the thoracic cavity it expands into a 

 capacious reservoir, lying directly beneath the clavicle. Within 

 the sinus there is a slit covered by a strong valve that leads into 

 a vessel about the diameter of a pi»-head, which passes directly 

 into the sinus of Cuvier. PI. K (Figs. 7 and 8 ; 64) shows this 

 cephalic sinus papilla entering the sinus of Cuvier from the 

 front. Vogt speaks of this trunk as a mucous canal, and since 

 he could find no lateral mucous canal in the salmon into which 

 the mucous pores emptied, he inferred that they emptied into 

 this trunk. Stannius (24, p. 252-4) states that this trunk takes 

 its source from numerous transverse branches, and following 

 along with the truncus lateralis N. vagi terminates in caudal 

 and cephalic sinuses. In addition the latter receives lymph 

 from the head, gills, and trunk and empties into the precava 

 (truncus transversus). From footnotes Milne-Edwards gives us 

 the following additional information : Sihirus has three paral- 

 lel lateral lymphatic vessels. With some fishes, as for example, 

 the pike, roach, grudgeon, barb, and sturgeon, the lateral trunk 

 is prolonged into the head and forms a sinus at the base of the 

 skull, which empties into the jugular through a transverse canal. 

 With the salmon, cod, rays, and sharks, the lateral trunks open 

 into a pair of large cervical sinuses, that descend behind the 

 center of the scapula and reunite in the median line at the point 

 where the abdominal sinus joins them. Each of these scapular 

 reservoirs communicates with the anterior vena cava or ductus 

 Cuvieri through an orifice guarded by valves. Trois (28, 29, 

 30 and 31) gives a most excellent account of this vessel in 

 Lo-phius -piscatoriuS) Uranoscofius scaber, and in several of the 

 Pleuronectidas. He describes this trunk as ending in cephalic 

 and caudal sinuses, and has satisfied himself that the transverse 

 branches are not superfluous injecting mass as Vogt maintains. 

 These vessels in Lophins are portrayed as sending off branches 

 between the myotomes, which anastomose with similarly ar- 

 ranged profundus vessels, forming a sort of ladder network. 

 The transverse rami are represented as also anastomosing with 

 the dorsal and ventral lymphatic trunks. Uranoscopus (29, p. 

 20, and PL on p. 37) furnishes a beautiful example of a fish 



