PLATE III. 



PAOE 



Fig. 26. PACHTPOMA BIANGTTLATA. Natural size. 16 



Fig. 27. . PTYCHOSTYLIS CAFFEA. Slightly magnified. 



Fig. 28. CALLIOSTOMA TRICOLOR. 



Slightly magnified from a recent specimen. 



Fig. 29. Indet. Natural size. 17 



Fig. 80. Indet. Natural size. 17 



Fig. 31. ZIPPH.SA DKNTATA. Natural size. 18 



31 a. Top view of the dorsal plate. 



