MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12960130963).jpg (1750x3200) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (12960130963).jpg 62 <br> I W DAVIS ON PI8H-EEMAINS FOTJND IN THE <br> ranee of Ganoids of the genera Palceoniscus Amhlypterus and Acan- <br> thodes The entire absence of Goelacanihus and Megalichthys is also <br> peculiar The fauna generally is of a Permian type compared with <br> either that of America or Yorkshire ; and the supposition that the <br> beds form an unbroken connexion between the Coal-measures and <br> the Permian formation may happily prove correct <br> COMPSACANTHIJS TEIANGULARIS Sp nOV Davis Pig 1 <br> Spine 2-5 inches in length '2 inch in diameter at mid length <br> where it is greatest The spine on the posterior face is straight ; <br> the anterior face is slightly curved Prom <br> the centre the diameter becomes gradually Pig 1 ” Gompsacanthus <br> smaller in each direction ; at the apical triangularis sp nov <br> extremity it ends in a point; towards the Spine nat size <br> base the spine is thinner and somewhat <br> crushed The portion which has been im- <br> planted in the muscles contracts in size to <br> about three fourths the greatest diameter <br> There is a large terminal cavity which <br> passes up the centre of the spine towards <br> the point becoming smaller and the walls <br> of the spine proportionately thicker and <br> stronger as it ascends The lateral and <br> anterior surfaces are covered with a com- <br> bination of striations and flutings The <br> lateral faces are compressed towards the <br> front which gives a section of the spine a <br> triangular form The posterior portion is <br> circular ; and the apex is armed with two <br> denticles broad at the base compressed <br> laterally and ending in an obtusely rounded <br> point ; they are placed one behind the other <br> in a single row <br> Locality Cannel Coal Tingiey near <br> Leeds <br> The spine described above differs from C Icevis Newb in several <br> important respects Instead of there being a series of twenty or <br> thirty denticles on the posterior median line there are only two <br> and these are not hooked and acuminate ; the spine is shorter and <br> stouter ; its section is triangular It has only one row of teeth ; and <br> for this reason it is included in the genus Compsacanthus Newb <br> with the specific designation triangularis in allusion to its triangular <br> form <br> CoMPSACANTHUs MAJOR sp Hov Davis Pig 2 <br> Spine Part preserved 7 inches in length ; with the point which <br> is wanting the spine would have been about 7'5 inches in length ; <br> the breadth is '55 inch at the base and thence to the apex it <br> gradually and regularly tapers to a point It is straight and its 36090397 111264 51125 Page 62 Text 36 http //www biodiversitylibrary org/page/36090397 1880 Geological Society of London NameFound Compsacanthus NameConfirmed Compsacanthus NameBankID 4122934 NameFound Goelacanihus NameFound Megalichthys NameConfirmed Megalichthys EOLID 4654673 NameBankID 4234587 NameFound Palceoniscus Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 36 1880 Geology Periodicals Smithsonian Libraries bhl page 36090397 dc identifier http //biodiversitylibrary org/page/36090397 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-06 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12960130963 2015-08-26 16 59 00 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1880 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
