Page:American Seashells (1954).djvu/565

Rh Pallets about Vs inch in length. Cones shallow-cupped, with smooth, not drawn-out edges. Cones very crowded at the distal end. Do not con- fuse with B. goiildi which is more abundant and a larger species. Uncommon. Subgenus Fhimidella Clench and Turner 1946 Bankia fimbriatula Moll and Roch Fimbriated Shipworm Figure 95f South half of Florida and the AVest Indies. Pallets !4 to I inch in length. Cones deeply cupped, with beautiful, comb-like serrations on the edges. It has been found on the Pacific side of the Panama Canal, and those specimens were named Bankia canalis Bartsch. Genus Teredo Linne 1758 Similar to Bcmkia, but the pallet is made up of a single, paddle-shaped piece. Teredo navalis Linne Common Shipworm Both coasts of the United States. Europe and Africa. Shell like that in Bankia and subject to many minute variations. Each of the 2 calcareous pallets is spathate and compressed, but typically sym- metrical. The leathery blade is urn-shaped, widening regularly from a stalk of medium length, then tapering somewhat toward the tip, which is decidedly excavated. The base of the blade is calcareous, but approximately the distal third is normally covered by a yellowish or brownish chitinous epidermis. A very common and destructive species found boring in wood. Teredo bartscbi Clapp Bartsch's Shipworm South Carolina to north half of Florida to Texas. Introduced to San Diego, California. Shell close to T. navalis, but with the auricle typically semi-circular rather than sub-triangular in outline. Pallets: stalk long; blade short and deeply excavated at the top. Only the distal half of the blade is invested with periostracum, which is light horn-colored and semi-transparent, per- mitting the calcareous portion to be seen within as an irregular, hourglass- shaped structure with a deep sinus on either side. A common species. Teredo diege?isis Bartsch San Diego Shipworm Southern half of California. And south?