PLATE XII. 



Page. 



ENDOCERAS PROTEIFORME 86 



Fig. 1. View of siphuncle with included tube. 

 la. Cross-section of another specimen. 

 1 c. Opposite side of upper portion of fig. 1, showing annulated shell of the siphuncle. 



ORTHOCERAS, sp. T 87 



Fig. 1 b. Oblique, transverse section. The outer shell is restored and is too small, and it is 

 also less circular in outline. The fragment crossing the siphuncle is of acci- 

 dental origin. 



ORTHOCERAS, sp. ? 86 



Fig. 2. A portion of the shell, preserving a number of the septa and a portion of the 

 siphunclo. 



ORTHOCERAS MULTICAMERATUM f 86 



Fig. 3. Fragment showing the form of the tube, the septa, and a portion of the siphuncle. 



ILL^NURUS EUREKENSIS !W 



Fig. 4. View of the central portion of the head and outline of the convexity of the same, 



enlarged to two diameters. 

 4 a. Associated free cheek. 



BARRANDIA! McCovi 96 



Fig. 5. View of the glabella and fixed cheeks, and a longitudinal outline of the convexity 

 of the head, enlarged to two diameters. 



BARRANDIA f sp. T 96 



Fig. 6. View of the glabella. Natural size. 



ASAPHUS CARIBOUENSIS 98 



Fig. 7. View of the head within the facial sutures, also outline of longitudinal section. 

 7 a. An associated free cheek. 



7 6. Pygidium found in the same association. 



BATHYURUSf CONGENERIS - 92 



Fig. 8. View of glabella and fixed cheeks, enlarged to two diameters. 



8 a. Pygidium associated in the same layer of rock. 



BATHYURUS TUBERCULATUS 



Fig. 9. View of the glabella and a portion of the fixed cheeks, enlarged to two diameters. 



CYPHASPIS? BREVIMARGINATA 



Fig. 10. Enlargement to three diameters of the only specimen discovered. 



BATHYURUS f SIMILLIMUS - 



Fig. 11. Enlargement to three diameters, to show the character of the glabella and frontal 

 margin. 



