The Nautilus. 



Vol. XIX. 



APRIL, 1906. 



No. 12. 



NOTE ON A NEW VARIETY OF CERITHIDEA SACBATA GLD., FEOM 

 SAN DIEGO, CAL. 



BY S. S. BERRY. 



There is present in several Californian collections, and also in the 

 National Museum and elsewhere, a form of the 

 common Cerithidea sacrata Gould, which is " peculiar 

 in appearance, and might be none the worse for a 

 mutational name " (Dall). It differs from the ordi- 

 nary form, with which it intergrades, by being 

 smooth, or nearly so, and more tapering, as shown 

 in the accompanying figure. It is quite heavy and 

 solid, and in my specimens the callus of the aperture 

 is of a lighter and browner tint than is usual, and 

 the aperture is smaller and less inflated. Length 

 30 mm. The original C. sacrata was pretty smooth, 

 but for convenience in designating this form, espe- 

 cially as opposed to the heavily ribbed var. pullata 

 Gould, the name hyporhyssa is here suggested. All 

 the specimens seen are from San Diego, although it doubtless occurs 

 elsewhere. 



Stanford University, Feb. 10, 1906. 



