THE NAUTILUS. 



99 



NOTES ON SOME HAWAIIAN SPECIES OF DRUPA AND OTHER SHELLS. 



BY H. A. PILSBRY AND ELIZABETH L. BRYAN. 



The dredging of the channel of Honolulu Harbor by the gov- 

 ernment has brought to light many shells which were either 

 unknown before or among the greatest rarities to Honolulu col- 

 lections. The specimens picked up on the "dump" are often 

 quite perfect, though usually somewhat faded. Part of the 

 same species have been dredged alive by Mr. D. B. Kuhns, the 

 senior author having received specimens though Mr. D. Tha- 

 anum of Hilo. 



Drupa walkerae n. sp. PL 9 fig. 4. 



Honolulu Harbor, W. A. and E. L. Bryan. 



The shell is oblong-fusiform, very solid, the ground color light 

 buff. It is rather weakly plicate longitudinally, the folds and 

 valleys crossed by spiral cords, of which five on the last whorl 

 are larger, bearing erect liver-brown spines upon the folds ; two or 

 three small spirals are between each pair of the larger ones ; all of 

 the cords being densely scaly, the scales weaker between the cords. 

 On the penult whorl there are two spiral series of colored spines, 

 and one on each of several earlier whorls. The spine is straightly 

 conic, the apex rather acute (not perfect in am^ of the speci- 

 mens;. The aperture is rather narrow, white. There is a 

 series of about 6 teeth within the outer lip. The columella is 

 straight, massive, excised at the canal ; below the middle there 

 are several short, transverse and inconspicuous folds. 



Length 25, diam. (including spines) 16 mm. (type). 



Length 27, diam. (including spines) 16 mm. (old specimen 

 with worn spines). 



This handsome species is named for Miss Mary Walker, of 

 Buffalo, N. Y., long an enthuisastic collector of shells. It has 

 some resemblance to S. fragum (Blainville), but in that species 

 the aperture is wide, there is a row of spots in place of spines 

 below the suture, and the details of sculpture differ. S. conca- 

 tenatum (Lam.) differs in color, in the absence of strong sub- 

 sutural spines, the more open aperture, and details of sculpture. 

 Both have shorter spines than the Hawaiian shell, often 

 tubercles rather than spines. 



