124: BULLETIN OF THE iMUSEUM OF COMPARATIVE ZOOLOGY. 



EXPLANATION OF PLATE. 



Fig, 1. Section of Cerion (Mai/nardia) neglectum Mayn., to show the short parietal 



and axial lamiuas. Length of specimen, 25 mm. 

 Fig. 2. Section of Cerion (Diacerlon) Dalli Mayn., showing the double parietal 



lamina, the outer branch of which in the lower whorl conceals the inner 



one. Length of specimen, 34 mm. 

 Fig. 3. Section of Cerion uva Linn., sliowing the position of the teeth and the 



accessory lamellae in several upper whorls. Length oi tiie specimen, 



18 mm. 

 Fig. 4. Section of Cerion {Strophiops) decumanum Fer., showing the elongated 



parietal and faintly double axial laminas. Length of original, 42 mm. 

 Fig. 5. Venus (Anonialocardia) leptulia Dall. Length of original specimen, 12 mm. 

 Fig. 6. Chondropoma ivatlinqense Dall- Length of original, 8 mm. 

 Fig. 7. Awicula? (Microtralia) m'lnuscula Dall. Leugth of specimen, 2.3 mm. 

 Fig. 8. Tornat'ina parviplica Dall. Length of the type specimen, 6 5 mm. 

 Fig. 9. Cerion (Mai/nardm) A gassizii D&W. Length of specimen, 34 mm. 

 Fig. 10. The same, side view, showing the bevelled outer lip. 



Fig. 1 1 . Pyrazus septemstriatus, var. degeneratus Dall. Length of specimen, 8.2 mm. 

 Fig. 12 Pyrazus Rawsoni Krebs. View of a specimen a little more ribbed above 



than usual, but otherwise typical of this hitherto unfigured species 



Length of shell. 10.5 mm. 



All the figures were drawn from the original specimens by Dr. J. C. McConnell. 



