114 DENTALIUM-RHABDUS. 



Length 40, diam. at aperture 2'6, at apex 1 mill. 



Length 30, diam. at aperture 2'5, at apex 0'6 mill. 



Near Victoria, Vancouver Id., 60 fms. (Newcombe) ; Puget Sound 

 (Kennerley, and U. S. F. C. in 82-135 fms.) ; off TillamooJc Harbor, 

 Oregon, 786 fms. ; California, off Point Reyes, 50 fms., off Bodega 

 Head, 62 fms., off Cortes Bank, 984 fms., Santa Barbara channel, 

 205-233 fms., Monterey Bay, 13 and 37 fms. (U. S. Fish Commis- 

 sion). 



D. rectius CPR., Rep. Brit. Asso. Adv. Sci., for 1863, pp. 603,648 

 (no description) ; Proc. A cad. Nat. Sci. Phila., 1865, p. 59. NEW- 

 COMBE, Nautilus x, p. 18. TAYLOR, Trans. Roy. Soc. Canada (2), 

 i, p. 56. 



Allied to D. watsoni and D. cequatorium, species decidedly more 

 slender, and to D. dalli, a stouter, larger, more curved species. The 

 whole series is remarkable for the tenuity of the smooth shell, and 

 its unusual straightness. The specimen figured is no. 107707, U. S. 

 Nat. Mus., from Monterey Bay, 37 fms. Carpenter's type was from 

 Puget Sound, and measured 1*9 inch, in length. 



D. DALLI Pilsbry & Sharp, n. sp. PI. 21, fig. 46. 



Shell regularly but only slightly curved, evenly tapering, thin 

 and fragile; opaque, slightly bluish-white. Surface brilliant, glossy 

 and polished ; but in all specimens seen, mainly dead or luster less 

 whitish, from loss of the greater part of the superficial gloss, which 

 remains near the aperture only, or sometimes in patches or irregular 

 rings elsewhere. Growth-strice faint ; no other sculpture. Aperture 

 circular, not oblique. Apex rather large, with simple, circular, thin- 

 edged orifice ; no slit or notch. 



Length 45, diam. at aperture 4, at apex 1*5 mill. (type). 



Length 50, diam. at aperture 3*8, at apex 1*5 mill. (Bering Sea). 



Length 69, diam. at aperture 4'9, at apex 2'5 mill. (Acapulco). 



Bering Sea, N. of Unalashka, 351 fms., ChernoffsJci, Unalashka, 

 109 fms., and off Illinlink Harbor, 309 fms. Off Tillamook Bay, 

 Oregon, 786 fms. Off Point Conception, California, 278 fms., and 

 Sta. Barbara Channel, 265 fms. Off Acapulco, Mexico, 660 fms., 

 bottom temp. 39. (U. S. Fish Commission). 



This species is most nearly related to D. rectius Cpr., but it is 

 larger, less slender and more curved. The outer varnish or gloss 

 seems to be caducious, and is largely lost, leaving a mat white sur- 

 face, in the specimens seen. D. pretiosum often occurs with almost 



