124 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



EXPLANATION OF PLATE. 



Fig. 1. Section of Cerion (Maifnardia) neglectum Mayn., to show tiie short parietal 



and axial laminae. Length of specimen, 25 mm. 

 Fig. 2. Section of Cerion (Diacerion) Daili Mayn., showing the double parietal 

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

 one. Length of specimen, 34 mm. 

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

 accessory lamellae in several upper whorls. Length of the specimen, 

 18 mm. 

 Fig. 4. Section of Cerion (Strophiops) decumamim Fer., showing the elongated 

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

 Venus (Anoiiialocardia) leptalea Dall. Length of original specimen, 12 mm. 

 Cliondropoma wuttlnge.nse Dall. Length of original, 8 mm. 

 Auiicala? (Microlral'ia) minuscula Dall. Length of specimen, 2.3 mm. 

 TornaUna parv'iplica Dall. Length of the type specimen, 6 5 mm. 

 Cerion (Mat/nardm) Agassizii Dall. Length of specimen, 34 mm. 

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



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

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

 than usual, but otherwise typical of this liitlierto unfigured species 

 Length of shell, 10.5 mm. 



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



