2 WILLIAM V. ALLEN 



iron hcTiiiatoxyliii, and counter stained in a concentrated alcoholic 

 solution of orange G plus a little acid fuchsin. Some microscopic 

 observations were also made on the tail of a living Phanerodon 

 atripes (viviparous perch) embryo. This study was made at the 

 Herzstein IVIarine Laboratory of the University of California, 

 New Monterey, California. 



Literature. — In addition to the bibliographical lists given in 

 my previous papers several important works have come to my 

 notice; among which Favaro's monograph is of special interest. 



In this the author gives a detailed description of the distribu- 

 tion of the subcutaneous vessels in the tail region of a great num- 

 ber of species from Petromyzon to the most specialized of the 

 Teleostomi. Furthermore he gives the development of these 

 vessels in Acanthias vulgaris, Torpedo ocellata, Belone acus, and 

 Squalius cavedanus. In the Cyclostomes, Selachians, and Aci- 

 penser sturio they are portrayed as veins; while in the Teleosts 

 they are represented as lymphatics, Favaro considering the lym- 

 phatic system of the Teleosts as phylogenetically derived from 

 the corresponding subcutaneous veins of the lower orders of 

 fishes. In fig. 1 56 the gradual evolution of the vasa intermedia 

 of the Selachians to the longitudinal haemal lymphatic trunk of 

 the Teleosts is graphically shown. With Belone acus, Favaro 

 finds an embryonic condition in the haemal canal comparable 

 to the vasa intermedia of the Selachians. The following is a trans- 

 lation of the last paragraph of Favaro's paper, which is a concise 

 summary of the authors conclusions. ''Beyond (cephalad) the 

 heart, likewise certain lymphatics, as for example the haemal, 

 and indirectly to a certain extent the others, are derived from 

 the embryonal venous system so that it is possible in fishes to 

 recognize the close relationship, not only phylogenetic, but on- 

 togenetic as well, between the lymphatic and venous systems." 



If frecjuent reference to this most excellent work was not to be 

 made later, much more would be quoted here. 



By a most unfortunate circumstance no note of Favaro's mono- 

 graph was made in my last paper, although it appeared some time 

 prior to may publication. It is true I saw notice of Favaro's 

 work in the Bibliographia Zoologica, and i^laced an order for it 



