GEPHYREA INERMIA—BENHAM. 
21 
EXPLANATION OF PLATE 11. 
Figs, 1, 2. Phascolosoma margaritaceum, var. capsiforme. 
Fig. 1.—A yellowish papilla and its underlying gland, viewed from above ( X 250). The 
lines represent ridges running circularly on the skin; the papilla lies in the 
furrow. 
Fig. 2. —An oblique side view of a papilla ( X 250). 
Figs. 3-11. P. mawsoni. 
Fig. 3.— The animal with extended introvert and uncontracted posterior, viewed from 
the side ( X 2). 
Fig. 4.—The animal with introvert invaginated and the posterior end retracted, 
broadened and flattened, so that the terminal cone is only partially visible ( X 2). 
Fig. 5.—Posterior end of the same individual as drawn in preceding figure to show the 
fossa around the terminal cone, due to the retraction of the hinder end (X 2). 
Fig. 6.—Portion of the skin ( X 35). The lines represent the circular discontinuous 
ridges. 
Fig. 7.—A skin papilla, side view ( X 250). 
Fig. 8.—The same in optical section from above ( X 250). 
Fig. 9.—The tentacular crown (X 20). The dorsal surface with its cushion is directed 
towards the bottom of the plate ; the ventral margin carries the unpaired 
couple of tentacles. 
Fig 10.—Dorsal view of the tentacular crown ( X 20). 
Fig. 11 .—Dissection from the left side ( X 4). The intestine has been cut away; the 
right dorsal retractor muscle was cut through. The gonads are indicated at 
the foot of the ventral retractor muscles. 
Figs. 12-15. P. eremita, var. australe. 
Fig. 12.—A papilla from the body, obliquely seen from the side. The base was 
embedded in mud up to the level of the dotted line (X 35). 
Fig. 13. —Another papilla in optical section ( X 35). 
Fig. 14.—One of the papillae from the .introvert, paler and much smaller than those on 
the body ( X 35). 
Fig. 15.—Dissected from the left side ( X 4). 
