260 _ LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF PLATE XIII. 
Figs. 1 to 6, Molgula hancockt, n. sp. 
Figs. 7 to 12, Molgula citrina, Ald. and Hane. 
Fig. 18, Ciona intestinalis, Linn. 
Fig. 14, Hugyra glutinans, Moller. 
ad, Adhering area. t. Intestine. 
at. Atrial aperture. 7.1. Internallongitudinal bar. 
br.f. Fold of branchial sac. p.p. Peripharyngeal band. 
d.l. Dorsal lamina. sg. Stigmata. 
d.t. Dorsal tubercle. st. Stomach. 
g. Reproductive gland. v. Vessel of test. 
Fig. 1. Molgula hancocki, n. sp., natural size, from the 
right side. 
Fig. 2. Part of left side of same, with test removed to 
show the viscera, slightly enlarged. 
Fig. 8. Section of test of same, highly magnified, S. din. 
Fig. 4. Part of outside of test, showing the short pro- 
cesses and sand grains, magnified, 8. 1 in. 
5. Part of branchial sac from the inside, magnified, 
Swift’s 1 inch objective. 
Fig. 6. Dorsal tubercle and neigbouring parts, magnified, 
rls Le a). 
Fig. 7. Molgula citrina, Alder and Hancock, natural size, 
from the right side. 
Fig. 8. The same from the anterior end, showing the 
area of attachment (ad.). 
Fig. 9. Part of the branchial sac from the inside, mag- 
nified, S. 1 in. 
Fig. 10. A large and a small tentacle, magnified, 8. 1 in. 
Fig. 11. The dorsal tubercle and neighbouring parts, mag- 
nified, 5. 1 in. 
Fig. 12. The tailed larva of Molgula citrina, magnified, 8.1. 
Fig. 18. Diagram showing the inversion of the anterior end 
of Ciona, natural size. 
Fig. 14. Part of an abnormal mesh of the branchial sac of 
Eugyra glutians. 
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