Article: Observations on some lower Palaeozoic tremanotiform Bellerophontacea (Gastropoda) from North America

Muscle scars are described in Salpingostoma buelli (Whitfield 1878) and Tremanotus alpheus Hall 1865 with reference to finely preserved specimens of Bellerophon spp. The taxon Salpingostomatidae Koken 1925 is abandoned with transferal of Salpingostoma Roemer 1876 to the subfamily Bucaniinae of the Bellerophontidae. A new subfamily of the Sinuitidae, the Tremanotinae, is proposed to accommodate Tremanotus Hall 1865 and Boiotremus Horny 1962. Brief discussion is given of described species of the three genera from the Silurian of North America.