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PROCEEDINGS OF. THE MALACOLOGICAL SOCIETY. 



forms are brought side by side, when it is shown to lie chiefly in 

 the larger size, far heavier and more robust outline, and relatively 

 longer, more roomy aperture of montereyi. Otherwise they are very 



Fig. 1. — Mitra montereyi, n.sp., camera outline of type, from Monterey Bay, 



California ; approximately natural size. 

 Figs. 2-4. — Mitra montereyi, n.sp., camera outlines of three paratypes ; same 



scale as fig. 1. 

 Figs. 5-6. — Mitra idee, Melvill, camera outlines of two shells from San Diego, 



California ; same scale as figs. 1-4. 



nearly related, so much so that specimens from intermediate 

 localities may conceivably bridge the gap and bring the two forms 



