170 Prof. E. Forbes on Fossil Invertebrata from Southei-n India 



Plate IX. 



Fig. 1 a. Ammonites Egertoni : b. outline of back : c. septal suture. 



2 a. Ammonites Chrishna : b. outline of back : c. septal suture. 



3 a. Belemnites ? fibula (a fragment) : b. section, 



4 a. Alveolus of a Belemnites : b. one of the septa showing the position of the siphuncle. 



5 a. Turrilites ? planorbis : Z>. view of the back. 



Plate X. 



Fig. 1 a. Ammonites Menu : b. outline of back : c. septal suture. 



2 a. Ammonites Sugata : b. outline of back : c. septal suture. 



3 a. Ammonites Gaudama : b. fragment showing the form of its back. 



4 a. Baculites vagina : b. septal suture : c. section showing the surface of one of the 



chambers. 



5 a. Baculites teres : b. section. 



6 a. Hamites undulatus : 6. section. 



7 a. Hamites nereis, outline of a portion : b. section. 



8. Specimen of Hamites tenuisulcatus, showing the form of its extremity, which is coiled 

 in the manner of the genus Helicoceras of M. A. D'Orbigny. The outline is not a 

 restoration, but represents a specimen in the collection. The surface of the 

 coiled portion is abraded. 



Plate XI. 



Fig. 1 a. Outline of a portion of Hamites large-sulcatus : b. septal suture : c. section. 



2 a. Outline of a portion o? Hamites rugatus: b. septal suture: c. section. 



3 a. Fragment of the posterior portion of Hamites tenuisulcatus, showing the curve : b. sec- 



tion of the same : c. part of the same species above the curved {d) section : e. part 

 of a septal suture showing the bifurcated saddles. 



4 a. Outline of a portion of Hamites indicus ; b. septal suture, showing the bifurcated 



lobes and saddles : c. section. 



5 a. Largest specimen (not entire) of Ptychoceras sipho : b. portion of a young specimen : 



c. one still younger : d. lateral, dorsal and ventral lobes of the chambers in the full- 

 grown example: e,f,g. sections. 



6 a. Outline of a portion of Hamites subcompressus : b. septal suture : c. section. 



7 a. Ammonites Indra : b. outline of back : c. septal suture. 



Plate XII. 



Fig. 1. Voluta pyriformis. 



2. Voluta purpuriformis. 



3. Voluta septemcostata. 



4. Voluta muricata. 



5 a, b. Voluta Camdeo. 

 6. Voluta cincta. 



