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1,100,502 specimens across 6 departments, collected since 1754 — 100,256 names, 42,336 type specimens.

Haminoea
BPBM 258666
Geo. Willett; Thaanum, Ditlev, 1913
Laysan

Otopleura mitralis
BPBM 257108
Geo. Willett; Thaanum, Ditlev, 1913
Laysan

Williamia radiata
BPBM 259138
Geo. Willett; Thaanum, Ditlev
Laysan

Siphonaria thersites
BPBM 259238
Geo. Willett; Thaanum, Ditlev
Alaska

Siphonaria thersites
BPBM 259239
Geo. Willett; Thaanum, Ditlev
Alaska
