ANIMALS. 143 
Family TEREBRATULIDE (partim, Les Terébratules), Cuvier. 
CycLoTuyRID& (partim), Phillips, 1841. 
Erituyripa, Morris, 1846. 
Diagnosis.—Generally with an apically foraminated umbone, and a recurvedly 
folded loop. 
It is proposed to limit this family 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 (Megerlia, Waldheimia, &c.), they may 
readily be seen with an ordinary magnifier; but in others (Lpithyris, Hudesia, &c.), 
they cannot be detected so readily without a Stanhope lens. 
Genus Terebratula ( partim), Lhwyd, 1698. 
TEREBRATULA (sp. cranium, &c.), Miller, 1766. 
ANoMIa (partim), Linneus. 
TEREBRATULA (partim), Retzius (1788), Bruguiére, Lamarck. 
GryPuHus (sp. vitrea), Megerle, 1811. 
2™® Sous-sect. 1®* Div. Bracuiop., Hudes-Deslongchamps, 1837. 
TEREBRATULA (typified with sp. vtrea, after Lam.), King, 1846. 
Diagnosis.—The typical Terebratulidia; with a /oop more or less anneliform ; 
confined to the posterior portion of the shell; and attached to the crural base. Ladial 
appendages partly attached to, and projecting considerably in front of, the loop. 
Miiller, one of the earliest adopters of Zerebratula, having included in it species 
possessing the characters given in the above diagnosis, and Lamarck having headed 
the genus with the dnomia vitrea of Gmelin, we are prevented, according to the rule 
which has been adhered to in the present work, recognising the name Giryphus, 
subsequently proposed by Megerle, for the present group. I took precisely the same 
view in my paper on ‘ Palliobranchiata’; and accordingly typified the genus Zeredratula 
with the species dnomia vitrea. 
I am not aware of any species of the present genus occurring in older rocks than 
the secondaries. 
1 Report of the Fourteenth Meeting of the British Association, 1845. 
