PLATE XXI.— Continued . 
Pleurotomakia disjuncta. 
Page 84. 
Fig-. 18. The only specimen of the species yet kn'6wn, i; Showing the surface characters over most of the 
shell. The outer volution is disconnected from’the preceding near the'aperture, 1 but this ma^ 
be the result of extreme compression. 
Pletjrotomaria Ltjcina var. perfasciata. ' 
Page 83. 
Fig. 19. The lower surface of a specimen, showing the strong concentric, fasciculate striae of the upper 
surface continued across this part of the shell 
Fig. 20. The upper surface of the same, presenting the usual features of the species on the smaller volution, 
but showing stronger concentric striae on the larger volution. The specimen is obliquely 
compressed so as to destroy the rotundity of form. 
Pleurotomaria planidorsalis. 
Page 82. 
Figs. 21, 22. The under and upper surfaces’Of a specimen which is obliquely compressed, and having the 
spiral band nearly obliterated. 
