1906.] SYSTEM OF CERTAIN SPECIES OF AXURA. 1013 



(5) This bi-aneli, apparently the A. jyectorcdls superior, was 

 absent on one side in one individual, but in the other three cases 

 went irregularly to the Mm. sccqndarls and infrasjiinatus and the 

 scapula respectively. 



With regard to the other species, the two specimens of R. clamata 

 (text-fig. 145, p. 1015) agreed with one another and with the 

 above account in the main points. On the (right) side of the body 

 examined, the a. ihoracica superior had a forwaixl and upward di- 

 rection, going chiefly in one specimen to the M. iniertransversarius 

 capitis superior and in the other to the M. levator ayigtdi scapxdcB. 

 The thoracico-ahdominalis went to the Mm. ohliquus intei'nus and 

 transverso-scajndaris major. The coraco-clavicidaris passed thi-ough 

 the coracoid foramen. The fourth bi'anch went to the Mm.pectorales: 

 sternales and latissimns dorsi and to the skin under the pectoral 

 girdle. The fifth, which is omitted from tlie figure, went to the 

 scapular region. 



In R. hexadacti/la {text-G.g. 147, p. 1019) there were the same five 

 branches. The distance between the first two Avas much exag- 

 gerated in the figure to avoid confusion. The thoracico-ahdominalis 

 after supplying the M. transverso-scajndaris major, ran back as 

 an exceptionally long vessel in the substance of the Mm. ohliquus 

 externus and ohliquus internus. The fourth branch was divided 

 between the Mm. latissimtos dorsi and sid)scapidaris, the cutaneous 

 portion being absent. The fifth branch supplied the M. infra- 

 spinatus. 



Tn R. cateshiana (text-fig. 146, p. 1017) there were nine distinct 

 branches. Their relations will be more easily understood by 

 reference to the figure of this species, where, as elsewhere, though 

 at the risk of confusion, diagrammatic arrangement has been 

 avoided as far as possible. Pi-obably the third, fifth (posterior), 

 sixth, seventh, and ninth branches are to be homologised with the 

 five referred to above ; the first, second, foui-th (anterioi'), and 

 eighth being additional ones. On the side of the body that is 

 figured the third branch, presumably the thoracica sup>erior, had 

 completely united with the ramibs auricularis of the cutanea so as to 

 be distributed in common with that artery to the tympanic region. 

 On the left side, after passing round the region of the atlas, it 

 formed a fine anastomosis under the hinder border of the tympanic 

 membrane with the same branch of the cutanea. A second 

 anastomosis was formed here between the fourth (anterior) bi-anch 

 and a twig from the coraco-clavicularis, the latter ailery passing- 

 almost entii-ely through the coracoid foramen. The small fourth 

 and eighth branches followed the first and thii'd spinal nerves 

 respectively. 



R. tigrina was remarkable for the fact that the thoracica 

 superior and the thoracico-ahdominalis were each of them 

 represented by a pair of arteries, the first pair supplying chiefly 

 the M. intertransversarius capitis inferior, and the second paii- 

 almost wholly the M. ohliquus internus. Then followed, thirdly,, 

 the coraco-clavicidaris, passing wholly through the coracoicl 



