CLASS GASTROPODA 
33 
31.5; of last whorl, 23; of aperture and canal, 18; max. lat. of shell, in¬ 
cluding the varices, 12.5 mm. (Dali.) 
Type in United States National Museum, No. 110501. Type locality, 
Station 4784, in 135 fathoms, off Attu Island, Aleutian Islands. 
Range. Known only from type locality. 
Trophon beringi Dali, 1902 
Plate 30, fig. 6; see Part I, Plate 18, fig. 8 
Proceedings of the United States National Museum, 24:544. Bulletin 112, United 
States National Museum; PI. 10, fig. 6. 
Shell greenish-white, elegantly ovate-fusiform, with a rather elongated 
curved canal, the aperture and canal longer than the spire; whorls with the 
base gradually attenuated, not constricted, about six in number, with a dis¬ 
tinct but not deep suture and 9 to 12, low, sharp, rounded varices, with no 
obvious angle at the shoulder; surface with fine revolving striation, some¬ 
times partly obsolete; aperture white. Long., 40; max. lat., 17; long, of 
spire above aperture, 16 mm. (Dali.) Operculum dark brown. 
This is the shell regarded by Jeffreys, Adams, and Carpenter as B. 
clathratus in the north Pacific area; but if well-developed adult specimens 
be compared it will be seen that they are really not very similar. The young 
B . beringi are notably short and broad, and often show a pinkish tint with 
the varices whiter. ( Dali.) 
Trophon ithitoma Dali, 1919 
Proceedings of the United States National Museum, 56:337. 
Shell elongated, slender, acute, with a yellowish tinge, with eleven 
varices, spinose at the shoulder, with five or more whorls, the apex de¬ 
corticated ; suture distinct, more or less undulated by the sculpture; the 
varices sharp and imbricating; sculpture only of obvious incremental lines 
and here and there a minute vermiculation; aperture elongate-oval, outer 
lip thin, sharp; body erased; pillar arcuate, twisted; canal long,' narrow, 
curved. Height of shell, 38; of last whorl, 29; of aperture and canal, 25; 
diameter, 16 mm. (Dali.) 
Type in United States National Museum, No. 222623. Type locality, 
United States Fish Commission Station 4255, in Taiya Inlet, southeastern 
Alaska, in 253 fathoms. 
Range. Lynn Canal, Alaska. 
Trophon multicostatus Eschscholtz, 1829 
Plate 33, fig. 11 
Zoological Atlas, Part II; PI. 9, fig. 4, 1829. 
Testa fusiformi, multifariam lamellosa; lamellis integris supra angu- 
loso-acuminatis; labro integerrimo; cauda lata recta. (Eschscholtz.) 
[ 331 ] 
