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The Linnaean system of conchology ... / By John Mawe.

  • John Mawe
Date:
1823
Catalogue details

Licence: Public Domain Mark

Credit: The Linnaean system of conchology ... / By John Mawe. Source: Wellcome Collection.

    66/300 (page 30)
    the Cardia to be separated into three divisions, and those divisions into families. Specimens of this shell are found in almost every sea, and some, though rarely, at the mouths of the rivers Tees, Thames, &c. This genus has been named Cardium from the re- semblance which its species bear to a heart (kapdia)- Diviston L.—Heart-shaped, valves compressed, umbones alter- nating. Scientific Name. Locality. Common Name. Cardissa ----+++- East Indies -++-++++++++ Venus’s Heart -- Humanum -+ --- Fast Indies -+++--+++++¢ Concave----do -- Roseum ee se eeee Malay coast eoee reer care Rose eerw ee do ‘es Monstrosum +--+ South Sea Isles --++++-: - Recurved- --do -- Drvision I1.—Sub-cordate, longitudinally ribbed. One of the most rare species of this division ‘is the C. costatum, which has rows of white, hollow, elevated ribs, situated at’ regular distances, proceeding from the umbones to the margin; and the spaces between them are, in perfect specimens, of a fine dark brown color. The C. fragum and C. unedo differ from the other species of this division, their ribs being armed with small crescent-shaped scales. Famity 1.—Having a crescent shaped cavity beneath the umbones. Retusum ---+««- © “Tndia sess. Sesvcceeoe» Jiana's Heart ---