82 CALIFORNIA ACADEMY OF SCIENCES. 



Fig. 20. Tentacles iiiul peripliaryngealbaud, seen from within. The fully 



compounded form. Dorsal tubercle not well seen in this specimen. 



X 109. 

 Fig. 21. Corresponding parts and same view, excepting that more of the 



dorsal portion of the branchial sac is seen, of the much crowded 



not compounded form. X 109. 



PL.4TE III. 



Fig. 22. A nearly longitudinal section of the stomach and duodenum. 



X 230. 

 Figs. 23, 24, 25 and 2G, represent transverse sections of the posterior of 



the duodenum, passing, in the order of the numbers, toward and 



into the chylific vesicle. X 109. 

 Fig.- 26a. Diagramatic figure of the glandular portion of a coecum of the 



chylific vesicle. 

 Fig. 27. Cross section of the wall of the stomach. X 475. 

 Fig. 28. Small piece of a tangential section of the wall of the stomach. 



X 820. 

 Fig. 29. Small piece of a section of the test. X 700. 

 Fig. 30. Cross section of test and the eijithelial lining of the stolonic 



vessel. X 790. 

 Fig. 31. Portion of a tangential section of the test and its epithelial 



lining. X 640. 

 Fig. 32. Section through the point at which the branchial siphon of a 



developing bud is about to break through the test. X 475. 

 Fig. 33. A section similar to the preceding, birt at a considerably earlier 



stage. X 475. 

 Fig. 34. Cross section of the endostyle. 

 Figs. 35, 35a, 35b, 35c. Several varieties of the coarse granular cells of 



the blood. X 840. 

 Figs. 36, 36a. Cells of the blood with large nuclei, the latter ji;st divided. 



X 840. 

 Fig. 37. Three of the amoeboid cells of the blood. X 840. 

 Fig. 38. Three of the " irregular bodies " of the blood. X 840. 

 Fig. 39. Small portion the epithelium of the exterior of the branchial 



siphon, showing the drawn-out protoplasmic portions of the cells. 



X 840. 



