92 ALLEN 



the cephalic sinus a Httle behind the jugular opening. A large 

 pectoral sinus is said to lie at the base of the pectoral fin, which 

 sends off branches to the lateral trunk and one to the pericardial 

 sinus. The termination of the ch^-lous system is in the ductus 

 of Cuvier, on either side of the heart. 



On p. 369 Hopkins states that: "In a specimen killed by 

 pithing, the cephalic lymph sinus was exposed while the heart 

 was still beating ; the veins were gorged with blood but the 

 lymph sinus appeared perfectly clear and transparent, and at 

 no time was blood found in the lateral vessels. In several in- 

 stances a clear fluid was seen to run out of the lateral vessel, 

 when cut, in a fresh specimen." 



Were not constant reference to this paper to occur in the text 

 a far more complete report of it should be given here. 



The latest work bearing on this subject is by Jossifoo [o^. cit.). 

 He takes up in detail the lymphatics in Conger and Anguilla. 

 The main ducts of Conger (pp. 414-420) follow the vertebral 

 column from the tail to the skull. In the caudal region the 

 principal trunk (Z. Caud^ in PL 12) lies in the haemal canal, 

 directly below the caudal vein. When the thorax is reached it 

 divides, forming the two perivertebral lymphatic trunks [R. and 

 L,.Pr.S.), which continue cephalad along the sides of the verte- 

 bral column. At the level of the fifteenth and sixteenth verte- 

 brae the right trunk receives the lacteal canals {D.C/i.) from the 

 viscera, and upon reaching the fourth vertebra a transverse 

 vessel of considerable size {La.) connects the two trunks. At 

 the base of the cranium each perivertebral trunk empties into a 

 cephalic sinus (S.C.), which communicates with the jugular as 

 it leaves the skull, and both the orifices of the vein and the lym- 

 phatic trunk are said to be guarded by semilunar valves. This 

 sinus is so situated between the superior maxilla and the tem- 

 poral bone that the act of respiration must necessarily dilate and 

 contract it. In Anguilla the author (p. 418) states that upon 

 injecting the perivertebral trunks one invariably fills the bran- 

 chial lymphatic sinuses, situated outside the vertebral column be- 

 tween the gills. These sinuses communicate with the periverte- 

 bral trunks and serve as reservoirs to the lymphatic vessels 

 arising from the mucosa of the branchial arches. A pulsating 



