6 
obtuse: whorls 5 or 6, convex, very oblique; aperture oval, white, 
columella plaited in the middle, and slightly folded also near the 
base; lip tnick, reflected; umbiiicus pertorated; length 1.6, diam- 
eter .6 mm. 
Hartland, Vermont, abundant. Found on stones and about 
wharves, at Portland, Oregon, where it is sometimes covered at 
high tide. Texas. 
49 Pisidium adamsi 
50 Pisidium compressum 
51 + Pisidium virginicum 
52 Sphaerium securis 
53 Sphaerium sulcatum 
54 Sphaerium similis 
55 Anodonta undulata 
56 Unio complanatus 
Numbers 49 to 56—Hartland, Vermont, all abundant. 
57 Unio Heterodon 
58 Margaritana undulata 
Numbers 57-58—Hartland, Vermont, rare. 
59 Tracy, Charles Oliver 
List of land and fresh water skells, collected in Windsor Co., 
Vermont. ' 
The above list enumerated 60 species and forms (as shown in 
my numbers 1 to 58), with abundance or rarity noted. The 
nomenclature is not changed, and shows the names familiar to 
naturalists of the time. No date is given in the list. The death 
of this promising student is recorded in an early volume of the 
West American Scientist. 
————0 
60 Orcutt, Charles Russell: 
Shells of Lagoon Head. Published in West American Mollusca, 
1:28. The following (numbers 61 to 187), is an amplification of 
the above list. The list was the result of two or three days spent 
in the latter part of February, 1899, mostly spent in botanizing. 
No rocky beach was visited, all the living shells being collected 
in the lagoon, nearly due east of Cedrus Island, the landing being 
known locally as Santo Domingo. It is near the 28th degree 
north latitude, on the west coast of Baja California, a few miles 
north of Scammon’s Lagoon. 
61 Purpura biserialis 
A single large and fine living specimen was found by the writer 
some years before on the rocks near La Jolla, San Diego, Cal., 
the most northern locality known for this species. Only beach 
worn shells were found at Santo Domingo, but the species was 
found abundant at San Juan, Baja Cal., and at other points in 
the Gulf of California, and at Mazatlan, Puerto Angel, and Salina 
Cruz, Mexico. 
62 Chorus belcheri 
Shell often 6 inches long, color dull white somewhat tinged 
with brown; canal long, to the left of which is a deep, funnel- 
shaped umbilicus; spire beautifully crowned with circles of sharp 
horns, and about the middle of the outer lip there is a large 
pointed tooth. 
San Pedro, and San Diego, Cal., formerly abundant at San 
Diego (during the early whale fisheries), but now rare; abundant 
