Page:Field Notes of Junius Henderson, Notebook 4.pdf/31

 Bivalves Platyodon cancellatus-swollen beaks, spoon shaped tooth, finely cancellated exterior Mytilus californianus- common ribbed mussel Mytilus stearnsii- very small shell, numerous ribs Modiolus capax- red under epidermis, Terminal ((Island)) Modiolus rectus- long, slender, fragile Septifer bifurcatus-divided ribs, decks within beaks Donax laevigata-beaks near end ((?Tellina)) Donax flexuosus-beaks more nearly central. ((?Tellina)) Tagelus californicus-long, narrow razor shell, beaks central, very abundant. Siliqua lucida-small, beak nearer end, rib vertical within from beak to ventral edge Solen sicorius-beak terminal Solen rosaceus-beak terminal Phacoides nuttallii-finely cancellated ((Lucina)) Phacoides californicus- not cancellated (Portuguese Bend) ((Codakia)) Mactra falcata- 2 internal radiating ribs, long, triangular, small, sinus thus ((drawing in field book)) ((Spisula)) Mactra californica- sinus shorter, wide thus ((drawing in field book)) ((Mactrellina)) Mactra exoleta- Mexican (Cali. Pleist.) sharply triangular, convex, elevated umbo, sharp submarginal posterior ridge. Mactra hemphilli- large, triangular. Sinus ((drawing in field book)) Mactra catilliformis- oblong, large, sinus ((drawing in field book)) Tresus nuttallii- very large, oblong, spoon pit, big sinus, beak near end, largest except Tivella. Heterodonax bimaculata-small, purple rayed, brackish water (at Alamitos) Petricola-Irregular, rough, rock borers Zirphaea crispata- rough at one end, large, common Penitella penita-rough at one end, small, not common Diplodonta orbella- round, inflates Diplodonta sericata- round, less inflated Metis alta- big sinus, double ridge posteriorly, abundant Semele decisa- shape like above, rough, red at Terminal ((Island)) Saxidomus nuttallii-heavy, prominent growth wrinkle. Glycimeris intermedia- Terminal Isl. many toothed Cardium substriatum-small, nearly obsolete ribs-Terminal ((Island)) Cardium quadrigenarium- large 40 ribbed, ribs tuberculate on posterior angle