I found "tsubu", a shelfish, is called "whelk" in English.

  It was a fine day, but the temperature was about 25 degrees, which I felt a hint of autumn. In the morning, I went to the Midori-ga-oka ball park to see a high school baseball game between Tomakomai high school of industry and Hokkaido Sakae high school. The result was Sakae's win by 4-2. 　
  There was a phone call from Ms. Sogabe from the city office asking "What is called "Tsubu", a shellfish, in English?" I didn't know, so I checked the word in Wikipedia on the Net, and found the word "whelk", and called back to Mz.Sogabe.