1906.] 



SYSTEM OP CERTAIN SPECIES OF ANURA. 



1031 



this Frog among a number of others that were being dissected 

 by the students in the zoological class at King's College, London, 

 very generously offered to send me the specimen for description, 

 and I am much indebted to him for the opportunity of adding 

 a short account of it here. 



T.6i,-m. r.Tn.TTt 



r.p.m. 



Sana temporaria, 9 (X 2). 



Ventral view ot A. intestinalis communis, showing abnormal arteries to lungs. 

 I., spleen ; po.d., right lung ; po.s.. left lung. 



(For other lettering, see p. 1033.) 



Examples of similar abnormality, recalling the conditions of the 

 swim-bladder of Teleostean Fishes, have, as is well known, been 

 several times observed in the Common Frog. Dr. E. Warren, 

 when writing in 1902 (Zool. Anz. vol. xxv.), had himself noticed 

 during the previous four years no less than five examples in about 

 200 individuals, Mr. B. B.Watson records a case in 1896 (Zool. 

 Anz. vol. xix.). Mr. G. P. Mudge describes very fully (Journ. 

 Anat. Phys. vol. xxiii.) a most remarkable instance, in which not 

 only were both kings involved in arterial and venous connection 

 with the systemic circulation, but the A. hepatica was absent, its 

 function being discharged by a branch from the left A.pulmonalis. 

 In this latter example, a compai-ison is drawn by the author with 

 the Ophidian type. 



In Mr. Woodland's specimen, of which two figures are appended, 

 Proc. Zool. Soc— 1906, No. LXYIII. 68 



