152 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D. Ser. 



EXPLANATION OF THE FIGURES. 



Plate XVI. 



Larval Stages of Lytoceras alamedense, sp. nov. 



Figs. I, 2. Protoconch, from above, and front, '^%. 



Figs. 3, 4. Protoconch and two-thirds of a coil, diam. of 1.04 mm., 



twenty times enlarged. Phylembryonic to metanepionic, 



twenty times enlarged. 

 Figs. 5, 6. First whorl, diam. 1.21 mm., metanepionic, twenty times 



enlarged. 

 Figs. 7, 8. One and one-third coils, diam. 1.81 mm., metanepionic to 



to paranepionic, twenty times enlarged. 

 Figs. 9, 10. One and two-thirds coils, diam. 2.15 mm., metanepionic, 



through paranepionic, to ananeanic ; twenty times en- 

 larged. 

 Figs. 11,12. Neanic (adolescent), two and one-third coils, thirteen times 



enlarged, diam. 3.00 mm. 



