-"86 ALFRED GIBBS BOURNE. 



hairs, giz. Posterior portion of the gizzard, showing the thick muscular and 

 chitinous walls, ca. gl} The most anterior calciferous gland, ca. gl.^ The 

 most posterior calciferous gland, int. Intestine, m. rad. Radiating muscle. 

 t} and t- The anterior and posterior testes of the left side. These have 

 been completely pulled away from the septal wall to render them visible. 

 fun} and/?<«.2 The seminal funnels corresponding to the two testes drawn. 

 sem. res. Seminal reservoir, ov. Ovary, ■pr. prostate. 



PLATE VIII. 



Fig. 4. — Slightly diagrammatic side view of the blood-vessels of the anterior 

 portion of the body. The iutestino-tegumentary vessels and their branches 

 are represented by a dark colour in this and the succeeding figures in which 

 they occur, the other vessels by lighter colour. The greater portions of the 

 hearts in Segments x — xiii have been removed. The numbers i — xiii are 

 placed close to the branches of the dorsal vessel belonging to those segments 

 respectively. The lines numbered iv . v — xviii . xix mark fairly exactly the 

 position of the septa at the level of the vessels drawn. Portions of the 

 alimentary canal are marked as in fig. 3. The various peripheral networks 

 are shown diagrammatically. a. Vessel passing from the supra-intestinal 

 vessel to a heart, b. Vessel passiug from the dorsal vessel to a heart. /./. 

 Muscular bulbs at the distal extremities of the hearts, g. g. Branches of 

 the intestino-tegumentary vessels bringing blood from peripheral networks. 

 B. /.' Anterior, and B. I? posterior dorso-intestinal vessel of one segment. 



Fig. 5. — View from the dorsal side of portions of the dorsal vessel 

 and its connections in Segments vi — xviii. The dorsal vessel is shown 

 cut in several places, and the cut ends turned backwards. The hearts 

 and dorso-tegumentary vessels are shown cut short, a. b. As in fig. 4. 

 c. Commissural vessels joining the two supra-intestinal vessels, d. Anterior 

 termination of the supra-intestinal vessels, e. Posterior termination of the 

 supra-intestinal vessels. 



PLATE IX. 



Fig. 6. — Diagram of the vessels in a segment containing a calciferous 

 gland. With regard to the origin of the dorso-tegumeutary vessel in this 

 region, see p. 023. B, W. Body-wall. B. C. Body-cavity. Other letters as 

 before. 



Fig. 7. — Diagram of the vessels in a segment in the typhlosolar region. 

 The arrows denote the direction of the blood flow. I. IF. Intestinal wall. 

 ti/ph. Typhlosole. INT. Intestine, h. Vessels from the intestinal capillaries 

 joining the dorso-intestinal vessel, j. Vessels passiug from the main intes- 



