172 EXPLANATION OF PLATES. 



Fio. 4.— KOSTELLAEIA? TEXANA. 

 Fig. 4 a, b. Two views of the same specimen. 



Fio. 5.— BUCCINOPSIS PARRYI. 



Fig. 5 a, h. Two views of the same specimen. 



PLATE XIV. 



_Fio. 1— TURRITELLA PLANILATEKIS. 



Fig. 1 a. A fragment of the shell, natural size. 

 I b. A part of the surface, enlarged. 



Fig. 2.— R0STELLITE8 TEXANA. 



Fig. 2 a, b. Two views of same specimen. 



Fig. 3.— NEEINEA SCHOTTII. 



Fig. 3 a^ b. Two views of same specimen. 



Fig. 4— NODOSARIA TEXANA... 



Fig. 4 a. Exterior view of specimen, enlarged. 

 4 b. Longitudinal section. 

 4 c. A transverse section. 



PLATE XV. 



Fio. 1.— AMMONITES PEDERNALIS, (Var.) 



Fig. 1 a. Lateral view. 

 1 b. Front view. 



1 c. Plan of septa, enlarged. 



Fig. 2.— ammonites GENICULATUS. 



Fig. 2 a. Lateral view. 



2 b. Front view. 



PLATE XVI. 



Fio. 1.— ammonites TEXANUS. 

 Fig. 1 a. Lateral view. 



1 b. View of aperture. 



1 c. Plan of septa, enlarged. 



1 d. Young variety, (after Roemer.) 



Fio. 2.— ammonites LEONENSIS. 



Fig. 2 a. Lateral view. 



2 b. Aperture, &c. 



PLATE XVII. 



Fig. 1— OSTREO VESPERTINA. 



Fig. 1 a, b. Exterior and interior of upper valve. 

 1 c, d. Exterior and interior of lower valve. 



