14 WILLIAM F. ALLEN 



or anal ray arteries would apply equally well to the distribution 

 of the corresponding neural, haemal, lateral, dorsal or ventral 

 lateral, and the dorsal or anal ray veins (figs. 4, 4a, 9 and 10, 

 Xeu. v., Hce.V., L.V., D.L.V., V.L.V., and D.R.V.). 



In general with the primitive fishes, Cyclostomes and Sela- 

 chians, but one kind of intersegmental artery or vein is portrayed 

 by Mayer and Favaro. It is represented as forking immediately 

 after leaving the haemal canal into a dorsal or neural and a ven- 

 tral or hsemal vessel; both of which send out numerous branches 

 to the muscles, and a mesal branch to the spinal cord. In some 

 cases, however, the haemal or ventral v^essels may arise from or 

 empty into the main longitudinal trunks. In the Ganoid Lepisos- 

 teus (p. 52) these intersegmental vessels- were found to be practi- 

 cally the same as described above for Scorpaenichthys. With the 

 Teleosts, Vogt, Sappey, Mc.Kenzie, Vogt and Yung, and Favaro 

 found the neural and haemal vessels to be entirely separated, aris- 

 ing or emptying directly into the caudal artery or the caudal vein. 

 They, however, portrayed incorrectly a neural and a hsemal artery 

 and a neural and a hsemal vein for each intermuscular septum. 

 Silvester, however, described the correct relationship of these 

 vessels in the tile-fish. 



LYMPHATICS OF THE TAIL 



A transverse section, as shown by fig. 12, through the caudal 

 peduncle of Scorpaenichthys or Clinocottus severs six great longi- 

 tudinal lymphatic canals. Four of which are superficial or sub- 

 cutaneous, namely, the dorsal, ventral, and lateral lymphatic 

 trunks , and two are deep seated, namely, the longitudinal neural 

 and hsemal lymphatic trunks. These lymphatic trunks collect 

 superficial and deep networks, which are decidedly lymphatic 

 in the character of their meshes, from all tissues that are supplied 

 with blood vessels. So far as could be determined these lymphatic 

 canals had no connection with the blood vessels, either capillary, 

 or direct with the caudal vein.'- Nevertheless, as will be noted in 



-' In an etirliui' paper on (lie lynijjliat ics of the head region of 8eorj)ainichthys it 

 was erroneoufily statod that the conihinod trunks formed by the union of the longi- 



