‘oe te Ae 
tw ba 
Cie Me ol ee el ee Be eh a 18 
racum; inequilateral, the anterior end shorter and more attenu- 
ated, the posterior lomger, more vertically expanded; surface 
sculptured only by incremental lines; a rounded ridge extends 
from the inconspicuous beak to the posterior basal margin, but 
there is no keel or angle; interior distinctly pearly, hinge as in 
the Atlantic species. Length 5.8, height 3, diameter 2 mm. 
21:0136 Pholadidea sagitta Stearns MS. ex Dall. Monterey, Cal. 
Shell closely similar to P. penita Conrad, but with shorter 
proportions, measured longitudinally, and with a corresponding 
widening of the dorsal appendages of the adult. In all other re- 
spects it resembles P. penita, of which it is doubtless a variety. 
Puget Sound to Socorro Island. 
21:0137 ACTAEON Montf. 
Shell solid, ovate, with a conical, many-whorled spire; spir- 
ally grooved or punctate-striate; aperture long, narrow, rounded 
in front; outer lip sharp; columella with-a strong, tortuous fold; 
operculum horny, elliptical, lamellar. 
21:0138 Actaeon punctocaelatus Cpr. (262), 1330, (1190). 
Barrel-shell. Shell white, with 2 gray bands narrow or 
wide; a small fold on columella and numerous revolving ribs; 
about 12 mm. long. Mr. H. N. Lowe reports having found a 
considerable number on Dead Man’s Island, San Pedro, Cal., in 
1898, but has never found it since. One of the rare species in 
San Diego bay, Cal. 
21:0139 ALECTRIONIDAE. 
Shell ovate, spire. usually elongated, base of aperture a 
notch or short recurved canal, inner lip usually callus; operculum 
corneous, ovate, nucleus apical, margins plain or serrated; ani- 
mal having 2 small processes or tails at its posterior extremity; 
lingual teeth arched, pectinated; uncini with a basal horn, and 
occasionally intermediate serrations. 
21:0140 Dall, W. H.: Summary of the mollusks of the family 
Alectrionidae of the west coast of America. U.S. Nat. Mus. 
pr. 51: 575-579. 
Enumerates the following, hitherto classed under Nassa 
eye now broken up into several genera. (See Nos. 21:141- 
21:0141 ALECTRION Montf. (Nassa Lam. 1799, in part, non 
Bolten, 1798.) 
Spire elevated, whorls glabrous, polished or papillary; inner 
lip spreading; outer lip denticulate, not variced externally. 
21:0142 Alectrion fossatus Gould, 1850. (158). 
Shell about 45 mm. long, 25 in greatest diameter, spire 
conical, apex pointed; surface light ash, marked with spiral and 
transverse ridges, the former appearing also within the outer 
lip; lip and bright orange callus of enamel spread over the col- 
umella varies greatly with the age of the animal; canal short, 
abruptly reflected, just above it a deep ditch or fossa, from 
which is derived the specific name. Ranges from Vancouver 
Island to the vicinity of Cedros Island, and perhaps south. 
’ 
i ‘Wie Iw Ths ae eur cee 4 ee. Sivraes. 
OD Ba D4 yl bay ne We AR fy ae ae 
a8 ay] Vig + VA Panay: Sy ip ha red 3 4 ye 
