!^es 



MANTTAI OP THE MOLLTJSCA. 



? Rmgcna (lima), Day. Cretaceous, Europe, Guadaloupe, 

 Valyes spiniilose ; loop trebly attaclied. 



Fig. 159. Ter. {Ki7ige)ia) lima, (after Davidson.) 



if dental sockets ; J, cardinal process ; c, crura ; d, diverging processes of loop , r, re- 

 flected portion ; e, third attacluneut of loop ; s, dorsal septum. 



? Ismenia (pectunculus), King. Coral rag, Europe. Valves 

 ornamented with, corresponding ribs ; Ioojd trebly attached. 



? Waltonia (Yalenciennei), Dav., New Zealand. Perbaps 

 tlie fry of Ter. ruhicunda, mtb the reflected part of tbe loop 

 wanting. 



Zellania (Davidsoni), Moore, 1855. [Etymology, Zella, a lady's 

 name ?) Shell minute, ortbi-form ; texture fibrous ; binge- 

 area sbort, foramen angular, encroaching on both valves; interior 

 of dorsal valve as in Thecidium, with a single central septum 

 and broad margin. Fossil. Lias — Great Oolite. 3 species. 

 Britain. 



Fig, 160. Argiope decoUata. ^ Fig. 161. A, Neapolitana, Sc* f- 



Aegiope, Eudes Deslongchamps. 

 Etymology, Argiope, a nymph. 

 Synonym, Megathyris, D'Orbigny. 

 Type, A. decollata, PL XV., Fig^ 10. Fig. 160, 162. 

 Shell ".ninute, transversely oblong or semi-ovate, smooth or 



♦ Ulterior of dorsal valves magnified, from the originals in Coll. Davidson. 



