Page:Field Notes of Junius Henderson, Notebook 4.pdf/32

 Cardium procerum-22 subangular, smooth ribs, narrow grooves between-angle nearer anterior side. Cardium corbis-37 prominent, squarish, regular, close set ribs, slightly rugose by growth lines-ribs less prominent and rounder toward posterior side. Cardium elatum- numerous faint, square ribs, fine wavy growth lines, very large, nearly smooth surface. Tivela stultorum-large, heavy, short triangular sinus Cryptomya californica- spoon tooth in one valve, shell small, oblong. Lima dehiscens-small, oblique, narrow winged, finely ribbed as in Pteria Pecten aequisulcatus- large, abundant Pecten circularis-now lives only S of Cali. Pecten latiauratus-thin, round. Common Pecten (Hinnites) giganteus-large, heavy, irregular Anomia lampe- radial ridges, common at Long Beach Anomia limatula-southern, no radial sculpture Ostrea lurida- common Ostrea lurida expansa- circular Ostrea lurida rugoides-red within Monia macroschisma- like large heavy Anomia, green within, muscle scar radial ribbed Chama exogyra- sinistral from above, not pellucid Chama pellucida- dextral from above, pellucid Psammobia-oblong, red rayed, sharp cardinal tooth with vertical raised plate back of it. Macoma secta-large, with horizontal plate back of cardinal tooth, sinus large and irregular, posterior external ridge-common. Macoma nasuta-smaller, no plate back of tooth posterior point bent back Chione succinata- concentric ridges remote, prominent lunule with growth lines and radial ribs Chione undatella- concentric ridges more numerous and regular, and more prominent than ribs, lunule not radially ribbed Chione fluctifraga- surface blocked, no lunule, sinus small on this genus, cf. next Paphia staminea- concentric and radial ridges about equal, cancellation beautiful Paphia ruderata- concentric ridges much heavier than ribs Paphia tenerrima- concentric and radial lines fine, sinus in this genus very long Amiantis callosa- common, fine.