34 WILLIAM F. ALLEN 



tically the same as in Acipenser; while there are no connecting 

 vessels between the vasa vasorum and the caudal vein, the former 

 becoming the longitudinal haemal lymphatic trunk. It is also 

 of interest to note that in the haemal canal of an embryo of Belone 

 acus, Favaro finds a similar arrangement to the vasa intermedia 

 as represented above for Squalus. 



With the Ganoids, Hopkins did not protray any longitudinal 

 neural or haemal trunks for Amiatus. In Lepisosteus there is no 

 longitudinal neural trunk, but I found (p. 64) two longitudinal 

 haemal trunks in the haemal canal of the tail region, which passed 

 laterad under one of the posterior vertebrae and anastomosed 

 with the lateral trunks in forming the two sinuses (x), which 

 emptied into caudal sinuses that terminated in the, caudal vein. 

 Strange to say no haemal vessels were observed. 



In the Teleosts Vogt does not mention either of these profundus 

 longitudinal lymphatic trunks in Salmo. Hyrtl notes a longitudi- 

 nal neural trunk in Leuciscus, which collects lymphatic vessels 

 from the dorsal fin, but has nothing to say concerning a longit- 

 udinal haemal trunk. Trois finds in Lohpius (pp. 11-12) and in 

 Uranoscopus (pp. 25-6) that the superior and inferior longitudinal 

 spinal trunks are well developed. His fig. 4 shows these trunks to 

 fuse behind the last vertebra, and apparently also with the dorsal 

 and ventral lymphatic trunks. Behind the abdomen, interspinal 

 vessels are said to connect these trunks with the dorsal and vent- 

 ral trunks. In the Pleuronectidae, Rhombus maximus, R. laevis, 

 and Pleuronectes grohmannij Trois represents (pp. 43-4, and fig. 

 2, D^ and D-) in addition to the above mentioned profundus 

 trunks, that two other longitudinal trunks travel along on a level 

 with the apices of the neural and haemal spines, and anastomose 

 with the interspinal vessels. These he claims to have described in 

 an earlier paper, prior to Sappey's description of them for Lucius 

 lucius. In P. grohamanni cross branches were observed by Trois 

 passing from the inferior longitudinal spinal trunk to the superior 

 longitudinal spinal trunk. Sappey's description of these pro- 

 fundus lymphatic trunks in Lucius and Pleuronectes is similar to 

 that given by Trois, except that these trunks are not portrayed as 

 extending to the last vertebra. Favaro finds in Tinea vulgaris 



