A7mJ> Ma^. IVal^ist VoI.iS ?1 HY. 



STRUCTURE of SHELLS 



fig 7. 

 Shr&d of Terebrattila(^)>^^&^. 



.^(iv'crhy, del a, li/Ji.. 



S(>cfM'H, vfrodfi of M:\'a arenai'ia;. 



prelWk.Limi..anp 



