jan. — mar. 1857.] voyage from England to Madras. 165 



Fig. 21. Cleodora : (magnified) shell triangular, compressed. 



a. Front view. 



b. 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. 



b. Front view. 



c. Transverse section at the aperture. 



d. Natural size. 

 Genus Ckeseis, 



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 Cttvieria. 



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 ; branchice ? supported on 3 pair of lateral lobes. 



Fig. 27. Glaucus : natural size. Taken 34 S. Lat. 20 



W. Long. 



Fig. 28. Qlaacus : 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. 



