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1089 



TERTIARY FAUNA OF FLORIDA 



necessary to select perfectly preserved examples, as in the great majority the 

 minor characteristics have been lost. 



This species is the subject of one of Conrad's perennial blunders. In 1862 

 he proposed the name of C. carolinensis (sic) for the C. magnum of Tuomey 

 and Holmes, which he supposed not to be C. magnum of Born. Again in 

 1867 he proposes the same name for the C. muricatum of Tuomey and Holmes. 

 In 1875 he again uses the name for a supposed new species of Trachycardium 

 from the Cretaceous of North Carolina, making three distinct species to which 

 he has applied the specific name carolinensis in the 'genus Cardium, besides 

 his Protocardia carolinensis of 1875, also from the North Carolinian Cretace- 

 ous. 



Cardium (Trachycardium) muricatum Linnet 



Cardium muricatum Linne, Syst. Nat., ed. x., p. 680, No. 69, 1758 (not p. 679, No. 62, 

 = aculcatum in errata, p. 824). Not of Emmons, 1858, Tuomey and Holmes, 1856, 

 or Guppy, in part, 1874. 



Cardium campechiensc Bolten, Mus. Boltenianum, p. 191, No. 407, 1798. 



Cardium muricatum Reeve, Conch. Icon., ii., Cardium, pi. vi., fig. 33, 1844. 



Cardium Gossei Deshayes, P. Z. S., 1854, p. 330. 



Pleistocene of Florida, the Atlantic coast of Middle America, and the West 

 Indies ; recent from the coast of North Carolina near Cape Hatteras south- 

 ward to Santa Caterina, Brazil ; among seaweeds in one to four feet of water, 

 Krebs, but in deeper water towards the extremes of its range. 



The typical locality for this species is Campeche, and considering its varia- 

 bility in some particulars it is curious that the species has but two synonyms. 

 The species has from thirty to forty-one ribs, the first twelve of which have 

 seated on the anterior side of their flattened summits pedunculated nodules in 

 a single, not crowded series, resembling little incisor teeth pointing with their 

 broad edges towards the umbo of the valve; the next posterior pair of ribs 

 have a double series, one on each side of the top of the rib, alternating, and 

 not unlike the cusps of little canine teeth, also pointing upward ; the number 

 of ribs with this double series varies from one to four, but is usually two; 

 about fourteen ribs next posterior have only a single series set obliquely on 

 the posterior side of the ribs ; then follow about six with similar processes 

 but more blade-like and twisted, then one with a double set of blades, and 

 three or four with a single set rather longer and more crowded ; the inter- 

 spaces are narrow and hardly channelled ; the inner margin has short serrations 

 all round and radial sulci extend over the inner disk to the umbonal cavity. 



