TAB. II. 



[In every case right-hand Scuta and Terga are figured ; hence the occludent margins are always to the left-hand.'] 



Fig. 1. Scalpelliim maximum, var. typicum. 



(«) Carina, twice natural size. {d) Section of carina across middle of valve, twice 



(fi) Ditto, lateral view, natural size. natural size. 



(c) Ditto, ditto, twice natural size. (e) Section of carina across lower part of valve. 



Fig. 2. Scalpellum maximmn, var. cylindraceum ; all the figm-es twice the natural size, 

 except the sections. 



(a) Carina. (c) Section of carina, upper part. 



(b) Ditto, lateral view. (d) Ditto, ditto, lower part. 



Fig. 3. Scalpellum maximum, var. sulcatum. 



(a) Carina, twice natural size. {d) Section across the middle of carina, four times 



(6) Ditto, natural size, natural size. 



(c) Ditto, lateral view. 



Fig. 4. Scalpellum maximum ; carinal latus, two varieties. 



(a) Natural size. (c) Natural size. 



(6) Magnified four times. {d) Magnified four times. 



Fig. 5. Scalpellum maximum ; Tergum, Var. I., natm*al size and twice magnified. 



Fig. 6. Scalpellum maximum; Tergum, Var. II., natm'al size and twice magnified. 



Fig. 7. Scalpellum maximum ; Tergum, Var. III. 



(a and a) Natural size, and twice magnified. (6) Internal view, twice magnified. 



Fig. 8. Scalpellum maximum; Var. I. 



(a) Scutum, twice natural size : some longi- {h) Scutum, natural size. 



tudinal lines have been erroneously (c) Ditto, internal view, twice natural size, 

 introduced in this engraving. 



Fig. 9, Scalpellum maximum ; Var. II. 



(a) Scutum, outside view, twice natural size. {h) Scutum, internal view, twice natural size, 

 (c) Scutum, outside view, natural size. 



Fig. 10. Scalpellum maximum; Var. III. Scutum, inside view, natural size. 



Fig. 11. Scalpellum lineatum. 



(a) Scutum, natural size. {b) Scutum, twice natural size. 



Fig. 12. Scalpellum lineatum ; Carina twice natural size. 



Fig. 13. Scalpellum hastatum. 



(a) Carina, twice natural size. {c) Carina, lateral view, twice natural size. 



(6) Ditto, natural size, lateral view. {d) Ditto, section across middle of valve. 



