This group does cause a lot of confusion. I'm on my lunch break at work now, so I don't have a copy of the Compendium in front of me; but I do recall the illustration you refer to. If I remember correctly, the slender shell you mentioned is actually Hemifusus carinifera, which is not the same as H. ternatana. Many authors consider H. ternatana, H. tuba, and H. colosseus to be conspecific. H. ternatana is a smooth-shouldered, rather lightweight form; H. tuba is a spiny-shouldered form; and H. colosseus is a large (commonly over 300 mm), heavy, tall-spired form. All three are rather common in the waters around Taiwan and Japan. The ternatana form also occurs in the Philippines, but I'm not sure if the tuba and colosseus forms occur there. H. carinifera is common in the Philippines though. It is a more slender species, with heavier spiral sculpture, and a very long siphon canal; and it is commonly medium to dark brown in color (all the forms mentioned above are typically a light cream color). H. carinifera seldom exceeds 125 mm. I believe (again working from memory here) it is pictured in Shells of the Philippines. I believe H. elongata may be a synonym for H. carinifera, but I'm not certain on that point. Paul M. Rhode Island, U.S.A.