ANIMALS. 143 



Family Terebratulid^ {partim, Les Terebratules), Cuvier. 



CYCLOTHYRiDiE {partim), Phillips, 1841. 

 Epithyrid^, Morris, 1846. 



Diagnosis. — Generally with an apically foraminated umbone, and a recurvedly 

 folded loop. 



It is proposed to limit this famUy to those genera which have generally the foramen 

 at the apex of the umbone, and the apophysary system in the form of a loop ; and it is 

 further proposed to recognise certain modifications of the latter structure as diagnostic 

 of generic divisions. 



All the known genera have their valves characterised with punctures, which have 

 been very faithfully and elaborately detailed by Dr. Carpenter, as they occur in a few 

 species.^ The punctures vary in size : in some Qlegerlia, Waldheimia, &c.), they may 

 readily be seen with an ordinary magnifier ; but in others [Epitliyris, Eudesia, &c,), 

 they cannot be detected so readily without a Stanhope lens. 



Genus Terebratula {partim)^ Lhwyd, 1698. 



Terebratula (sp. cranium, &c.), Midler, 1766. 



Anomia {partim), Linnceus. 



Terebratula {partim), Retzius (1788), Bruguiere, Lamarck. 



Gryphus (sp. vitrea), Megerle, 1811. 



2"^ Sods-sect. 1"^ Div. Brachiop., Eudes-Deslongchamps, 1837. 



Terebratula (typified with sp. vitrea, after Lam.), King, 1846. 



Diagnosis. — The typical Terebratulidia ; with a loop more or less anneliform ; 

 confined to the posterior portion of the shell ; and attached to the crural base. Labial 

 appendages partly attached to, and projecting considerably in front of, the loop. 



MiiUer, one of the earliest adopters of Terebratula, having included in it species 

 possessing the characters given in the above diagnosis, and Lamarck having headed 

 the genus with the Anomia vitrea of .Gmelin, we are prevented, according to the rule 

 which has been adhered to in the present work, recognising the name Gryphus, 

 subsequently proposed by Megerle, for the present group. I took precisely the same 

 view in my paper on ' Palliobranchiata' ; and accordingly typified the genus Terebratula 

 with the species Anomia vitrea. 



I am not aware of any species of the present genus occurring in older rocks than 

 the secondaries. 



^ Report of the Fourteenth Meeting of the British Association, 1845. 



