708. 
704. 
705. 
706. 
(hove 
708. 
709: 
710. 
(alae 
EIS On SPECIES 315 
P. carltonu, Lea, West Coast Shells, p. 119. 
P. cooperi, Tryon, West Coast Shells, p. 119. 
P. costata, Newc., S. I. Mis. Coll. No. 148, 
jon MU 
P. gabbi, Tryon, Nautilus IX, p. 102. 
var. orbignyana, Lea, Nautilus V, p. 56. 
var. trasku, Lea, Nautilus V, p. 56. 
P. politissima, Tryon, West Coast Shells, p. 
iy 
P. humerosa, Gould, 8. I. Mis. Coll. No. 148, 
D: 92; 
P. triticea, Lea, Nautilus III, p. 49; XVII, 
p. 84. 
P. diaphana, Tryon, Nautilus V, p. 56. 
P. virginea, Gould, Nautilus V, p. 56. 
P. ampullacea, Gld., Nautilus XV, p. 112. 
var. columbiana, Hempl., Nautilus IV, p. 
Dill 
P. gyrina, Say, Nautilus XV, p. 112. 
Genus, pnysetla, Pfeiffer 
P. columbiana, Hempl., West Coast Shells, 
De £20: 
Genus, aplexa, [Fleming 
A. hypnorum, Linne, Figure 132. 
var. tryoni, Currier, Nautilus XV, p. 112. 
Genus, Pompholyz, Lea 
P. effusa, Lea, Nautilus XII, p. 60; XII, 
p. 65. 
Genus, carinifex, Binney 
C. newberryi, Lea, Nautilus XIII, p. 65. 
Genus, Planorbis, Guettard 
