pb., is the pubic symphysis [which has been] cut through. R., the rectum, with r.g., the rectal gland, and a., the anus. t., the tail. r.ur., the right ureter. l.ur., the left ureter. ur.b., the urinary bladder. In the Male ep., the epididymis. P., the penis. pp., the prepuce. scr., the scrotal sac, containing these; r.v.d., the right vas deferens. T., is the testis. u.m., the uterus masculinus. In the Female c.ut, the left cornu uteri. F.t., the left Fallopian tube. ov., is the ovary, with a Graafian follicle, G.F. V., the vagina. v.b., the vestibule. Figure 3. Diagram of ovary with stages in the development of a Graafian follicle 1, 2, 3, 4, 5, see text, Section 137. The arrow indicates the changes in position of the developing follicles. {Illustration: Diagram Sheet 10.} Sheet 11. Figure 1. General dissection of Frog (male). Figure 2. The heart and great vessels laid open. Figure 3. The circulatory system from the side. Figure 4. Blood. {n., nucleus.} r.c., red corpuscle (oval and nucleated). w.c., white corpuscle Small figure of Frog in left-hand corner is to show position of heel, h. Reference Letters. all.b., allantoic bladder (= urinary bladder). c.ad., corpus adiposum. cl.c., cut end of the right clavicle. d., duodenum. g.b., gall bladder. il., ileum. k., kidney. l.au., left auricle. l.g., lung. l.int., large intestine. l.s.v., longitudino-spiral valve. L.v., Liv., liver. pan., pancreas. r.au., right auricle. sp., spleen. st., stomach. T., testis. t.a., truncus arteriosus. ur., urogenital duct. v., ventricle of heart. Arteries (white). ao., aorta. c.a., carotid arch. c.g. [c.gl.], carotid gland. coe., coeliac. cu., -and pa.",- cutaneous. d.ao., dorsal aorta. e.c., lingual artery. [i.c., internal carotid.] l.a.a., left aortic arch. pa., and p., pulmonary. p.c. [p.cu.], pulmo-cutaneous. r.a.a., right aortic arch. [s.cl., sub-clavian.] t.a., truncus arteriosus. Veins of the Caval System -(black)-. b.v., brachial (from fore limb). e.j., external jugular. h.v., hepatic vein. i.j., internal jugular. [in.v., innominate vein.] l.v.c.s., left vena cava superior. p.v., cutaneous vein. [s.cl.v., sub-clavian vein] s.s.r., sub-scapular vein. v.c.i., vena cava inferior. Veins of the Portal and Renal Portal Systems -(shaded)-. a.ad., and a.ab.v., anterior abdominal vein. b.v., and p.v., united are called the sub-clavian vein. l.fm., left femoral. l.p., left pelvic. l.r.p., (and r.p.) left renal portal. l.sc., left sciatic. p.v., portal vein. -(The anterior abdominal is coloured black in Figure 1.)- The cutaneous artery in the above figures is turned back. In dissection it will be found to lie over and hide the dorsal-ward sweep of the aortic arch. {Illustration: Diagram Sheet 11.} Sheet 12. Figure 1. Upper view of the Frog's brain. Figure 2. Under view of the same. Figure 3. The same-- median section. Figure 4. The distribution of the Frog's nerves. Compare Sheet 9, Figure III.