124 TRANSACTIONS LIVERPOOL JiLOLOGICAL SOCIETY. 



21. Sweet, G. — " On the Variations in the Spinal Nerves of Hyla aurea." 

 Proc. R. Soc. Victoria. N. S. Vol. ix., pp. 264-296. 1897. 

 19 statistical tables. A careful work on the subject, 

 containing a detailed examination of 125 variations. 



-2-1. Waite, F. C. — "Variations in the Brachial and Lumbro-sacraJ 

 Plexif of Necturus maculosus, Rafinesque." Bull. Mus. 

 Conip. Zool. Harvard Coll. Vol. xxxi., No. 4, pp. 71-91. 

 PI. 1 and 2. 1897. Discusses questions of intercalation and 

 excalation of vertebrae, and the supposed movement of the 

 sacrum along the vertebral column. 



The papers of Hardesty (2), Dunn, Donaldson and Donaldson and 

 Schoemaker, containing critical analyses of the nerves of the frog, which 

 have appeared in recent numbers of the Journal of Comparative Neurology, 

 may be consulted in this connection. 



* Papers marked with an asterisk I was not able to consult at the 

 time of writing. 



f Lumbosacral plexus or plexuses is evidently intended. 



Explanation of the Figures. 



Fig. 1. Dissection of R. temporaria from below, to show 

 abnormal configuration of the Rami ventrales 

 longi of the spinal nerves. 1 — 9, the centra 

 of the vertebrae ; i. — x., the ll.lv. ventrales 

 longi of the ten spinal nerves ; N.Br., Nervus 

 brachialis ; N. Coc, N. coccygeus ; N. Co. CI., 

 N. coracoclavicularis ; NN. Cr., Nervi crurales ; 

 N.Hy., N. hypoglossus; NN. II. Hy., NN. 

 iliohypogastric!; N.Sc, Sciatic nerve (N. 

 ischiadicus) ; Ur., Urostyle. X 2. 



Fig. 2. Similar dissection of a R. esculenta, vi. ?, missing 

 sixth nerve ; xi., extra or eleventh nerve. 

 Other letters as before. X 2. 



