File:Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia (1888) (14779670755).jpg

Identifier: transactionsproc1113phil (find matches)
Title: Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia
Year: 1878 (1870s)
Authors: Philosophical Society of Adelaide, South Australia
Subjects: Philosophical Society of Adelaide, South Australia Science
Publisher: Adelaide : The Society
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ted. Post-dorsal line nearly straight, or slightly incurved,bounded by a slightly depressed linear-lanceolate area. Umbodepressed, rather acute, situated in the anterior one-fifth. Sur-face distinctly concentrically wrinkled. Dimensions.—Antero-posterior diameter, 16 5; dorso-ventraldiameter, 9*5; sectional diameter of both valves, 1 millimetre. Localities.—Dredged in life from 10 fathoms at Wool Bay, St.Vincent Gulf (McDougall and Matthews); dead shells dredgedfrom deep water. Investigator Straits (South Australian Museum). If I^andora trilineata, Reeve, from Ceylon, be a Coelodon, thepresent shell may have to be referred to it, as the only external■diflerential characters are a slightly different shape (a straighterhinge line and a more acute posterior margin) and the absence ofa nodulose dorsal rib. Mactra Matthewsi, spec. nov. Plate xi., fig. 4.Shell ovately trigonal, nearly equilateral, subtruncated behind,obtusely rounded in front. The post-dorsal margin is straight ?L XI.
Text Appearing After Image:
.HERRING &Co,Li.HO. 61 .and soniewliat sloping, the antero-dorsal one is slightly incurved;the ventral margin is nearly straight, but slightly insinuate pos-teriorly. The umbo is small and acute. The shell is thin, concentrically coarsely striated or folded ; thecolour is yellowish, whitish, or pink, usually varied with brownrays, those at each extremity are broader and more frequentlypresent. Dimensions.—Antero-posterior diameter, 18 ; umbo-ventraldiameter, 11-5; sectional diameter of united valves, six milli-metres. Locality.—Common on the beach at Royston Head (Matthews). This species must not be confounded with J/. Jacksoniensis,from which is distinguished by its coarse ornament, less archedventral margin, its blunt posterior margin, the less defined post-dorsal area and the equilaterality. From 31. jyusilla, A. Adams,it differs by not being acuminate at both ends. Raeta meridionalis, spec. nov. Plate xi., fig. 3. Shell whitish, very thin, translucent; ovately - suboblong,

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