j^jf. — MAR. 1857.] voyage from Etigland to Madras* 165 
Fig. 21. Cleodora : (magnified) triangular, compressed. 
a. Front view. 
h. Posterior view. 
c. Section of aperture. 
d. Natural size. 
Fig. 22. Cleodora : double the natural size; shell hyaline, 
with broad undulating transverse sulci. 
a. Lateral view. 
h. Front view. , 
c. Transverse section at the aperture. 
d. Natural size. 
Genus Creseis, , 
Shell as in Cleodora but slender, conical, straight or curved 
Fig. 23. Creseis : (magnified) shell elongated, carinated, 
pointed, straight ; alee of the animal fringed. 
a. With the animal as when swimming ; natural size. 
Fig. 24. Creseis : (magnified), appears to differ little from 
Fig. 23, alee of the animal rounded, simple. 
a. With the animal, natural size. 
Fig^ 25. Creseis : (magnified) Shell curved at the point. 
a. With the animal, natural size. 
Genus Cuvieria. 
Shell cylindrical, transparent ; aperture simple, ovate ; apex 
acute in the young, afterwards jointed and often deciduous. 
Fig. 26. Cuvieria— (magnified). 
a. With the animal, natural size. 
Genus Glatjcus. 
Animal elongated, slender ; foot linear, channel-led ; tentacles 
four, conical ; hranchi<^ ? supported on 3 pair of lateral lobes. 
Fig. 27. Glaucus : natural size. Taken 34 S. Lat. 20 
W. Long, 
Fig. 28. Glaucus—', natural size. Taken near the shore 17*42 
N. Lat. 83 W. Long. 
PLATE XII. 
Chart of the track of the American Clipper Blue Jacket showing 
the localities at which the different specimens of Molluscs as indi- 
cated by their numbers, were captured. 
