OF CONCHOLOQY. 107 



Genus WALDHEIMIA, King. 



Waldheimia, King, Perm. Foss. p. 81, 1850. 



Macandrevia, King, Proc. Dub. Univer. Zool. and Bot. Assoc. 

 1859, p. 261. 



Eudesia, King, Perm. Foss. p. 144. 



Lampas^ Humph, (pars.) 



? Rynchora, Dalm. (pars.) 



Waldheimia, Woodw., Gray, Dav. and the generality of au- 

 thors. 



Loop elongated and reflected, without secondary attachments. 



Fig. 5. 



Fig. 5. Muscul.ar system of Waldheimia. 2 nat. size, after Hancocli. a, a, 

 adductors; r, cardinals; x, accessory cardinals; p, p^, z, pedicel muscles ; o. 

 mouth ; I, apophyses ; t, dental socket. 



Subgenus Cryptonella, Hall. 



Loop exactly resembling that of Waldheimia, proper, except 

 in the addition of a transverse band from one side of the apo- 

 physes to the other, behind the crura. 

 Cryptonella, Hall, 14th Rep. Reg. Univ. N. Y. 1861, p. 102, 20th 



Rep. 1867, p. 20, 21. Pal. N. Y. vol. iv. pp. 392, 393. 

 Type, Terehratula rectirostra. Hall. Fossil in the Devonian of 

 New York. 

 This genus has hitherto been confounded with Centronella, 

 Billings, from which it would now appear to be quite different. 



Subgenus Waldheimia. 



Shell globose, neural beak more or less produced ; foramen 

 complete or incomplete. Deltidia separated or united ; pedun- 

 culated ; a ridge or septum usually existing in the haemal valve. 



Mouth behind the brachia, which consist of two lateral lobes 

 and a central spiral lobe. 



