PLATE I. 



Fi". ... 1. Teredo partita, SloL, p. 15; 1, a portion of the tube with the anterior end, a 

 cast ; 1 a, side-view of the anterior end, showing the position of the valves, 

 both natural size; 1 b and 1 c, side- and front-views of the two valves in natural 

 position, enlarged three times ; Ootafoor, Ooiatoor group. 



Pio-. ... 2. Teredo crassvla, Stol., p. 16 ; 2, a portion of fossil-wood with fragments of the 

 tubes, natural size ; 2 a and 2 b, enlarged side- and front-views of the valves taken 

 from one of the tubes of the same specimen of wood ; Ootatoor, Ootaioor group. 



Fig. ... 3. Teredo torulosa, Stol., p. 16; 3, a portion of a tube with the anterior end perfect, 

 natural size ; 3 a and 3 b, enlarged side- and front-views of the valves ; Moravia- 

 loor, Ooiatoor group. 



Figs. 4 — 5. Teredo [Uperotes ?] gloxieran.s, &tol,, p. 17 ; two views of tubes of a somewhat 

 different form, natural size ; ComarapolUam, Arrxaloor group. 



Fig. ... 6. Turnus LAPiDARiTJS, <Sto/., p. 23 ; 6, a portion of stone with the tubes, natural size ; 

 6 a and 6 b, side- and anterior terminal views of a right valve, enlarged ; Odium., 

 Ooiatoor group. 



Fio-. ... 7. RocELLAEiA guttula, iS/oi?., p. 30 ; 7 and 7 a, side- and anterior terminal views, the 

 former showing the position of the left valve in the tube ; Odium, Ooiatoor group. 



Fif. ... 8. RoCELLARiA SP. IND., p. 31; two views of a tube of an undetermined species; 



Ninnyoor, Arrialoor group. 



Figs. 9—10. Clavagella semisulcata, i^o/i., p. 31 ; 9, 9 a, side- and ventral views of a cast 

 specimen; 10 and 10 «, side- and upper views of Forbes' original specimen, 

 with the shell ; Fondicliernj, Arrialoor group. 



Fig. ... 11. GASTEOCHaiNA ASPERGiLLOiDES, i^ori., p. 31* ; side- and terminal vicws of Forbcs' 

 original specimen ; Pondicherry, Arrialoor grotip. 



Figs. 12 — 13. SiLiquA LiMATA, 5/0^., p. 101; two specimens slightly varying in shape; Garuda- 

 mungalum, Tricldnopoly group. 



Fig. ... 14. Phakella DELiCATULA, 5i'o/., p. 101; Prtre/(.a?>y, T/jc^mo/^o/y yTO?(;;. 



Fio-. ... 15. Pharella OBSCURA, Fori., p. 101; a specimen with the shell near the umbones 

 partially preserved ; the probable shape of the shell was restored anteriorly and 

 posteriorly; Pondicherry, Valudayur group. 



Fig. ... 16. CoRBUi.A EXULANS, iS/o^., p. 45 ; [seei^A. y.v\, fig. I) ; Arrialoor, Arrialoor group. 



Fig. ... 17. C— CANCELLIFERA, <S/o/., p. 45; (scc pi. xvi, fig. 2); Garudamungalnm, Trichiiw- 

 poly group. 



Fig. ... 18. C — EXULANS, Siol, p. 45; interior view of the right valve; twice the natural 

 size ; Arrialoor, Arrialoor group. 



Fio-s. 19 — 22. C — MINIMA, d'Orb., p. 44; views of different specimens, all twice the natural size ; 

 (see pi. xvi, figs. 7-12) ; Odium, Ooiatoor group. 



Figs. 23 — 24. C— parsuea, 5to^., p. 44; (see pi. xvi, figs. 3—4); Garudamungalum, Tricldno- 

 poly group. 



* Quotod by uiistnke ns fig. 12. 



