PLATE XLVIII. 



Zone of Amaltheus oocynotus. 



Fig. 1. Amaltheus Lymensis, Wright. Side view, natural size; a highly ribbed 



variety. 



2. — — — Front view of do. do. My collection. 



3. Wiltshirei, Wright, nov. sp. A side view, natural size. My 



collection. 



4. Aegoceras Portlockii, Wright, nov. sp. Siphonal area, natural size. Museum 



of. Irish Survey, Dublin. 



5. — — — Side view, natural size do. do. 



