BERRY : ON MITRA MONTERBYI. 33 



into the relationship of sub-species rather than distinct species. This 

 is conjectural, however. Superficially the specimens of montereyi 

 much more nearly resemble the published figures of M. orientalis, 

 Gray (= maura, Swainson) than they do idee, and it was under the 

 name of maura that they were originally reported (Berry, 1907, p. 40). 

 The type locality of maura, however, is far removed, being Iquique, 

 Chile (Swainson, 1835, p. 193), and hence the range of both idcB and 

 fultoni, Smith, as well as that of other less nearly alhed forms, 

 intervenes. 



The type locality of M. idee is given as Point Loma, California. 

 Two San Diego specimens, entered as Cat. No. 202 of the writer's 

 collection, which were probably taken not far from the type locality, 

 are here, figured in order better to bring out the difierences as com- 

 pared with montereyi. Caliper measurements of the larger of them 

 are : length, 57*1 ; maximum width, 18*0 ; length of body- whorl, 

 37' 6 ; length of aperture, 25*5 mm. 



As shown by the figures, the contour of montereyi remains remark- 

 ably constant through the different stages of growth. 



AH the specimens seen are more or less eroded at the apex. 



Literature cited. 

 Berry, S. S. " MoUuscan Fauna of Monterey Bay, California " : 



Nautilus, vol. xxi, June-September, 1907, pp. 17-22, 34:-35, 



39-47, 51-52. 

 Melvill, J. C. " Description of a new species of Mitra " : Con- 



chologist, vol. ii, 1893. pp. 140, pi. i, fig. 6. 

 Swainson, W., in Broderip, W. J. " Characters of new genera 



and species of MoUusca and Conchifera collected by Mr. 



Cuming " : Proc. Zool. Soc. Lond., 1835, pp. 192-198. 

 Williamson, Mrs. M. B. " West American Mitridse, north of Cape 



St. Lucas, Lower CaHfornia " : Proc. Biol. Soc. Washington, 



vol. xix, December, 1906, pp. 193-198, text-figs. 1-7. 



VOL. XIV.— APRIL, 1920. 



