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