1906.] SYSTEM OF CERTAIX SPECIES OF ANURA. 1011 



raria it originated in one specimen on both sides of the body 

 in the aorta, just behind the origin of the suhclavia, while on 

 the left side there was an additional vessel from between the 

 suhclavia and the occipito-vertehralis. In another individual of 

 the same species it arose on both sides from the base of the 

 occipito-vertehralis. 



In R. cateshiana it oi-iginated between the suhclavia and the 

 occipito-vertehralis. It divided on the oesophagus, and the main 

 portion ran as a luther large vessel foi- a considei-able way down 

 the right side of the stomach, supplying a lai-ge portion of the 

 cardiac region, over which it formed a close network. A branch 

 of this network could easily be traced to the right lung, where it 

 formed an anastomosis with branches of the pulmonary artery. 

 Further back, its i-amificat ions' united with those of the ramus 

 sinister of the A. cceliaca. The point is not without interest as 

 showing how, ultimately, as one may conceive, through the medium 

 of such anastomoses a distinct vessel might aiise in a purely 

 secondary manner running either from the resopliagea or the 

 cceliaca directly to the lung. 



A. suhclavia. — The branches of this artery disti-ibuted to the 

 pectoral girdle are liable to much vaiiation in number, structui'e, 

 and distribution. I am inclined to think that a careful examination 

 of a large number of individuals is still needed to establish a 

 satisfactory type of arrangement for the Anura. Two figures are 

 appended showing their ari-angement on both sides of the body 

 in two individuals of R. tem.poraria which were injected together 

 for the purpose (text-figs. 143, 144, p. 1012). Here, before the 

 i-adial arterj^ was given off, there were five (in one case four) 

 arteries striking out at irregular intervals into the pectoral girdle, 

 roughly with an anterior and posterior alternation. Retaining 

 so far as possible the nomenclature of Gaupji : — 



(1) The ^4. thoracica siqoerior, arising from near the occipito- 

 vertehralis, took, in one of these two individuals, the usual course 

 upwards and forwards, supplying the Mm. intertransversarius 

 capitis superior and levator anguli scapidce on both sides of the 

 body. In the other individual, the artery went on one side to 

 the M. transverso-scapularis nitnor, and on the other side entirelv 

 backwards to the Af. ohliquus internus. 



(2) The A. thoracico-abdominalis went in three cases almost 

 entirely to the M. ohliquus internus ; in the fourth case to the 

 M. transverso-scapularis Tnajor. 



(3) The A . coraco-clavicularis, perhaps the most constant member 

 of the subclavian system, passed mainly in all cases through the 

 coracoid foramen to the M.jjectoralis sternalis, a branch being given 

 in two cases to the M. interscapularis. 



(4) This, the largest branch, appeared in all four cases to be a 

 combination of the Aa. dorsalis scapulce posterior and dorsalis 

 scapidce anterior of Gaupp. In three cases a branch went to the 

 M. pectoralis ahdominalis, but on all four sides one or more con- 

 spicuous branches ran to the skin of the upper arm or that of the 



