A pair of very small arteries, n², may be seen in the nasal chamber between and parallel to the branches, n¹; they lie close to each side of the nasal septum and supply the anterior nasal region. They apparently arise, as shown by the broken lines, from the loop of the superior dental artery, dm¹, though this could not be definitely determined. LETTERING FOR FIGURES 59-62 Aos., Aod., left and right aortic arches. ab, abdominal artery. ax, axillary vein. b, veins from body wall. br, brachial vein. br¹, brachial artery. c, cœliac artery. ca, caudal artery. capr, primary carotid. cc, collateralis colli artery. ce, cervical artery. cl, cloacal artery. cm, cm¹, common carotid artery. cr, crural artery. cv, caudal vein. da, dorsal aorta. dm, inferior dental artery of maxilla. dm¹, superior dental artery of maxilla. e, e¹, artery into skull, perhaps to ear. ej, external jugular vein. ep, internal epigastric vein. f, femoral vein. f¹, fibular artery. fb, fibular vein. g, gastric vein of portal. g¹, gastric vein of epigastric. ga, gastric artery. ghi, gastro-hepatico-intestinal artery. h, hepatic portal vein. he¹, he², hæmorrhoidal arteries. i, intestinal vein. ic, internal carotid artery. id, inferior dental vein. il, iliac vein. il¹, iliac artery. im, internal mammary vein. im¹, internal mammary artery. is, ischiadic vein. is¹, ischiadic artery. j, internal jugular vein. jm, jm¹, artery to jaw muscle. l, lingual vein. l¹, lingual artery. lg, laryngeal artery. lu, 1-7, lumber arteries (numbers on left side of figure). m, mesenteric vein. m¹, mesenteric artery. md, mandibular artery. mg, artery to musk gland. ms, muscular vein. n, artery to posterior nasal region. n¹, artery to anterior and mid-nasal region. n², artery to anterior nasal region. o¹-o⁴, arteries to eye. oc, artery to muscles at base of skull. oe, œsophageal arteries. pa, pelvic artery. pa¹, second pelvic artery. pb, post brachial vein. pc, post cava. pd, right pulmonary artery. pi, pancreo-intestinal artery. pl, pl¹, pelvic vein. plu, pleural artery. ps, left pulmonary artery. q, artery to muscle at angle of jaw. ra, radial vein. ra¹, radial artery. re, reproductive vein or artery. rp, renal portal vein. rt, rectal vein. rt¹, rectal artery. rv, renal vein. s, subclavian vein. sc, sciatic artery (Fig. 61). sc, subscapular vein (Fig. 60). sc¹, subscapular artery. sc.d., sc.s., right and left subclavian arteries. si, spleno-intestinal artery. sp, splenic vein. s.v., sinus venosus. t, thoracic vein. t¹, thoracic artery. tb, tibial artery. th, thyroid artery. tr, tracheal vein. u, 1-4, urogenital arteries (numbers on right side of figure). ul¹, ulnar artery. v, vertebral vein. v¹, vertebral artery. vca, anterior vena cava. vh, hepatic vein. vpd, vps, right and left pulmonary veins.