234 MOLLUSCA. 
sculptured with delicate, regular, obtuse, longitudinal rib-folds, about 
twenty-four on the last whorl, on the middle of which they disappear, 
decussated by more crowded, delicate grooves, a little undulating, 
about eight on the penultimate whorl, cutting the longitudinal ribs, 
and extending to the origin of the beak. Whorls seven, angular, 
forming a broad shoulder at the suture, which is well impressed, the 
last one three-fifths the length of the shell, abruptly forming a short, 
nearly direct beak. Aperture less than one-half the length of the 
shell, narrow; lip angular posteriorly, gently arcuate, sharp, and 
delicately crimped by the strie; pillar arched retrally, then straight, 
smoothly rounded, white; imterior white. 
Length of axis nine-twentieths of an inch; breadth equal to half the 
length. 
Inhabits Puget Sound, Oregon. 
The counterpart of I’. turricula, from some varieties of which it 
would not at first be distinguished ; but it is smaller, more solid; the 
longitudinal ribs less lamellar, and more decidedly cut by the re- 
volving lines, which are also less numerous. 
Figures 284, 284 a, two views of the shell, enlarged. 
Fusus orPHEUS (Gould ). 
Testa parva, elongata, cinerea: spira turrita, anfractibus sex superné 
angulatis, lamellis acutis longitudinahbus muricatis, et fils trans- 
versis cinctis ; anfractu ultimo postice ventricoso, antrorsum in 
rostrum viz reflecum attenuato: apertura elliptica, dimidiam longitu- 
dinis teste, postice angulata ; labro acuto ; columella antice intrudente; 
fauce carnicolort. 
Fusus orpheus, Gourn ; Proceed. Boston Soc. Nat. Hist., in. 142. 
May 1849. Expedition Shells, 65. 
SHELL minute, fusiform, thin, elongated, turreted, cinereous, with 
numerous longitudinal, lamellar, sharp, muricated ridges, thirteen on 
the last whorl, angular near the suture, crossed by rounded, raised 
threads of considerable size, which commence gradually in front of a 
