102 



Fig. 44. Amoeboid colourless blood corpuscles. 



Figs. 45 & 46. Heart bisected in median antero-posterior 

 plane. Pig. 45 shows dorsal portion from inner 

 surface, and entrance of anterior and genital 

 aortae; also triangular septum. Fig. 46 

 shows ventral portion from inner surface, with 

 openings of auricles and abdominal aorta, x 1. 



Fig. 4T. Heart bisected in median dorso-ventral plane, 

 and viewed from cut surface, (a) Left half 

 of heart — inner surface, showing triangular 

 septum, (b) Right half, x 1. 



Fig. 48. Semi-lunar auriculo-ventricular valves, looked 

 at from ventricle. x 1. 



Fig. 49. Diagram showing relation of inferior intestinal 

 arteries, and abdominal aorta, to artery of the 

 ink sac. x 1. 



Fig. oft. Buccal mass from left side, showing distribu- 

 tion of left pharyngeal artery and branches, 

 x 1. 



Fig. 51. Sketch showing distribution of left branchial 



artery, and its oviducal branch. 



Fig. 63a. Sketch showing polygonal cells of branchial 

 gland, and the intercellular blood sinuses. 



Fig. 65. Epithelial and olfactory cells lining the 

 olfactory pit. (After Zernoff.) 



Fig. 66a. Portion of cartilage, showing branching and 

 anastomosing processes of cartilage cells. 



Plate VII. 



Fig. -32. Figure of venous system, from ventral surface, 

 partly diagrammatic, showing principal 

 cephalic, and pallial veins, and three venae 

 cavae. x |. 



Fig. 53. Large perivisceral blood sinus and its connec- 

 tion with the lateral and anterior venae cavae. 

 Ventral surface, x i. Partly diagrammatic. 



Fig. 54. Two adjacent arms, showing venous vessels and 

 common interbrachial vein. x i. 



