144 PERMIAN FOSSILS. 



Genus Pygope, Link, 1830. 



The apophysary system of this group resembles that of the last genus ; but a 

 separation appears to be warranted by some presumed differences in their labial 

 appendages. From the singular prolongation or separation of the lateral halves, and 

 the undeveloped character of the medio-longitudinal region of the shell of Pygope 

 diphya, I am led to suspect that the labial appendages of its inhabitant were exceed- 

 ingly long, and separated from each other nearly at their base ; in which case the 

 lateral halves of the shell would each be occupied with the free and projecting portions 

 of these organs ; and there would consequently be no reciprocal connexion between 

 them except in the buccal region — a character unparalleled in any other known 

 Palliobranchiate genus, with perhaps the exception of Dicalosia. 



Fygope is only known to occur in the latest secondary deposits. 



Genus Eudesia,^ King. 



Terebratul.^, Auct. 



2^'^ SuBD., l"*^ Div. Brachiop., Eudes-Deslongchamps, 1837. 



Diagnosis. — A plaited Terebratulidia. Marginal outline more or less oblong longi- 

 tudinally. BeaJc projecting ; truncated with a loxge, foramen, which is bounded inferiorly 

 by a deltidimn. Punctures moderate in size. 



Type Terehratula orbicularis, J. Sowerby. 



JEudesia is proposed with some hesitation ; because it bears so close a resemblance 

 to the striated division of Terebratula, represented by T. caput-serpentis, which' is 

 suspected to be the type of A. d'Orbigny's Terebratidina, that it is doubtful whether it 

 is a distinct genus. 



Genus Terehratella, A. d'Orbigny, 1848. 



Not being acquainted with the diagnosis of this group according to the views of its 

 author, I make free to characterise it as having a loop projecting considerably into the 

 cavity of the shell, and attached posteriorly to the crural base, and anteriorly to the 

 medio-longitudinal plate. 



Type Terebratula Chilensis. 



^ This genus is dedicated to M. Eudes-Deslongchamps. 



