THE NAUTILUS. Ill 



the biggest and heaviest ; you turn over perhaps fifty to find one 

 shell. They are obtained by sheer hard work." H. H. S. 



This is one of the most striking species of the Stenotrema hirsuta 

 group, and differs from all others in having a continuous free lip ; the 

 lip-notch is also of an entirely different type, as it will be noticed by 

 a reference to the figures that the notch is not an indentation in the 

 center of the lip, but the lip forms a curve from the columellar end 

 to the highest part of the notch when it is suddenly deflected and 

 bent forward. The parietal tooth differs in being more perpendicular 

 to the body-whorl, not bent toward the Up, as in Stenotrema, where 

 the tooth is very convex on its outer side and concave on the side 

 next the lip, which it frequently overhangs. On looking into the 

 aperture, through the notch, the whole of the long fulcrum can be 

 plainly seen. 



The only species with which this is likely to be confused is P. 

 altispira Pils., but the resemblance, due to the wide notch in each 

 case, is only superficial ; for, as pointed out above, the notch is of a 

 different type. The hairs are also much finer, closer and shorter, 

 and the shape of the shell is entirely different. 



Type in my collection ; cotypes in the collections of the Academy 

 of Natural Sciences, Phila., Bryant Walker, T, H. Aldrich and 

 John B. Henderson, Jr. 



Reference to Figures. 



Figs. 1, 2, 3, 4. Polygyra (Stenotrema) brevifnla Clapp. 

 Figs. 5, 6, 7. Polygyra (Stenotrema'} altispira Pils. Roan Mtn., 

 N. C., specimen 9x6 mm., size of type. 



Figs. 8, 9, 10. Vilrea (Paravitrea) aldrichiana Clapp. Type. 

 Fig. 11. Apparent shape of teeth of V. aldrichiana. 



A NEW CAEDIUM FROM PTJGET SOUND. 



BY WILLIAM HEALEY DALL. 



Among the specimens of Cardium received from the Pacific coast 

 during a series of years was occasionally a specimen with more num- 

 erous ribs, smoother surface and small, compact shell, which was 

 doubtfully referred to the young of C. californien.se Deshayes, better 

 known under Gould's name of blandum. Recently in an endeavor 



