PLATE LXXVI. 



Fig. 1. Phyi,locbras Buvignieri, (TOrbigny. Side view, natural size. Belfast Museum. 



2. — — — Siphonal area, natural size. 



3. — — — Suture-line magnified. 



4. Lytockras tortjlostjm, Schiibler. Fragment, natural size. My collection. 



5. — — — Siphonal area showing shell and striae. 



do. do. 



6. — hircinum, Schlotheim. Showing striae and fimbriae, natural size. 



My collection. 



