120 
BULLETIN OF THE LABORATORIES 
view ; c, view of the regions posterior to the beaks ; all views magnified six diam- 
ters, 
F^'g. 9. Illccniis ambigtms, n. sp.; a, view of a pygidium seen from above ; b, 
lateral view of the same. 
Fig. 10. Illmius ambigiius, n. sp.; a, lateral view of a head, the associated 
movable cheek figured ; b, posterior view of the glabella ; c, view ot the same 
from above. 
Fig. II. lllccmis ambigims, n. sp.; movable cheek of unusually large propor- 
tions. 
Fig. 12. Gmmmysia Caswelli, n. sp.; a, lateral view of the shell, anterior 
definition too sharp ; b, view of the same from above. 
Fig. 13. triplesiajius, n. sp.; a, view of one of the valves; b, lat- 
eral view of the same shell. 
Fig. 14. triplesianus, n. sp.; view of the other valve from a different 
specimen. 
Fig. 15. Strophostyhis cyclostomus, Hall; lateral view of a specimen. 
Fig. 16. Trochoncnia nana, n. sp.; two views, magnified to eight-thirds and 
four-thirds of the original size respectively. 
Fig. 17. Cyclo 7 'a alia, n. sp.; a, lateral views of specimens showing variations 
in the elevation of the spire ; b, view of the umbilicus of a specimen ; all views 
magnified two diameters. 
, Fig. 18. Raphisioma affijtis, n. sp ; view from above, and also a lateral view, 
the umbilicus being directed upwards. 
