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; umbilicus periorated; length l.b, aiain- 

 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 adanisi 



50 Pisidium compressum 



51 Pisidium virginicum 



52 Sphaeriuni 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 shells, 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. 



60 Orcutt, Charles Russell: 



Shells of Lagoon Head. Published in West American Mollusca, 

 1:28. The following (numbers 61 to 137), 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 



