256 NOTICE OF THE OOLITIC FORMATION IN AMERICA, 



Trigonia Tocaimaana. Plate IX., Fig. 8. 



Testa trigond, postice productd, inflata ; coslis transversis, Icevibus. 

 Shell triangular, produced behind, inflated ; ribs transverse and smooth. 



Found between Tocaima and La Messa, New Granada. Dr. Gibbon. 



My Cabinet. 

 Diam. 1.5, Breadth 1.3 inches. 



Remarks. — Both the specimens received of this species were, unfortunately, 



quite imperfect. In both, the posterior angle is deficient. Judging from the 



curves of the margin, I presume that this species is produced like the T. ali- 



formis. (Parkinson, PI. XII., Fig. 9.) It resembles it, also, in outline, and 



in the position and direction of the ribs. 



Trigonia Hondaana. Plate IX., Fig. 9. 



Testa ovato-trigond, inflata, multicostatd ; costis transversis, tuberculato-nodosis ; area posticd ele- 

 vatd, crebrissimd nodosa. 



Shell ovately triangular, inflated, with many ribs ; ribs transverse, furnished with tubercles ; posterior 

 slope elevated, with numerous tubercles. 



Found between Guaderus and Honda, New Granada. Dr. Gibbon. 



My Cabinet. 

 Diam. 2.3, Length 3.3, Breadth 3.2 inches. 



Remarks. — This is larger than any species which has come under my no- 

 tice. A single; rather imperfect, specimen only was brought by Dr. Gibbon. 

 In its general outline and appearance it resembles T. Gibboniana, herein de- 

 scribed, and may prove to be only an old and very large individual of that 

 species. 



Natica Gibboniana. Plate IX., Fig. 10. 



Testa ovatd, ventricosd; spird productiusculd ; aufractibus quints, subplanulatis ; aperturd contractd, 

 elongata. 



