590 H. p. KJERSCHOW AGERSBORG 



membrane ; Cil, cilia ; Sb, sub mucosa ; Vas, highly vascular cover of 

 the organ ; that is, the tissue is very loose and seems to contain many 

 spaces or sinuses ; Vac, mucus vacuoles. 



Fig. 45. — Cross-section of the wall of the smaller intestine. Bg, terminal 

 bars ; Bm, basement membrane ; Cc, connective-tissue cover ; Cil, 

 cUia ; Kar, chromatin granules ; Lcc, loose connective-tissue layer or 

 sub mucosa with many vascular sinuses ; Nuco, nucleolus ; Nn, nucleus ; 

 Nus, nuclear sap ; Sv, secretion vacuoles. 



Figs. 46, 47. — The same as fig. 45. The secretion vacuoles are not so 

 large. Bg, terminal bars ; Cil, cilia ; Sv, secretion vacuoles, x 1,013-4 ; 

 (o.i., c.l.) 



Fig. 48. — Longitudinal section of one of the main branches of the 

 hepatic caeca. Xii, nucleus ; Sc, secretion cap (product), x 1,013-4 ; 

 (o.i., c.l.) 



Fig. 49. — -Longitudinal section of hepatic branch, showing the very 

 variable condition in adjacent cells, (h.p., c.l.) 



Fig. 50. — Cross-section of hepatic branch in the body-wall of the hood. 

 Sg, secretion product. X 1,013-4'; (o.i., c.l.) 



Fig. 51. — Cross-section of hepatic branch from the body-wall. Dsc, 

 darkly staining cells ; Gc, vacuoles ; L, lumen ; Xn, nucleus. 



Fig. 52. From ' x ' in fig. 53. (h.p., c.l.) 



Fig. 53. — Cross-section of a branch of the liver in the tentacle. X 107. 

 (l.p., c.l.) 



Fig. 54. — Schematic drawing of the heart and part of the pericardium. 

 Aa, anterior arteries ; Ao, descending aorta ; Aosh, very fine transparent 

 sheath of the aorta ; An, efferent branchial veins ; Per, pericardium ; 

 Vent, ventricle. 



Fig. 55. — Longitudinal section through the auricular part of the heart. 

 Au, efferent branchial veins ; Av, auricular apertures in the auriculo- 

 ventricular valves (Ar) ; Be, blood-cells ; Etid, epicardium ; Vejit, 

 cardiac wall of the ventricle. 



Fig. 56. — Blood-gland from the wall of the aorta just below the ventri- 

 cular valve (vide fig. 59). Aosh, sheath of aorta ; L, lumen. X 107. 

 (l.p., c.l.) 



Fig. 57. — Longitudinal section of the aortic waU opposite the blood- 

 gland seen in figs. 56 and 59. Cmf, cardiac muscle-fibres. Section 

 15 micra thick. x 1,013-4 ; (o.i., c.l.) 



Fig. 58. — Blood-cells from the lumen of the aorta, a, b, from the 

 inside of the blood-gland (node), fig. 56 ; (\ from the lumen close to the 

 gland. X 1,013-4; (o.i., c.l.) 



Fig. 59. — Longitudinal section of the lower part of the ventricle of 

 the heart. Bgl, blood-gland (node) ; Pc, pericardium ; Valve, valves 

 between the aorta and the ventricle ; Vw, ventricular wall ; Wda, wall 

 of the aorta, (h.p., c.l.) 



