866 CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 
anal fins. Dorsal and anal fins fiigli in front, rapidly decreased back- 
wards; caudal fin low, and with a wavy outline. Depth always more 
than half length, and in the young tbe vertical diameter exceeding the 
longitudinal. Form varying much with age, the body becoming more 
elongate, the fins comparatively shorter, the eye much smaller, and a 
hump being developed above the mouth, topped by an osseous tubercle. 
Head 3; depth If. D. 17; A. 16. Pelagic, inhabiting most temperate 
and troxiical seas, swimming slowly about near the surface; common 
northward to Caxie Cod and Point Conceiicion. It reaches a weight of 
about 500 pounds. 
(Tetrodon mola Liun. Syst. Nat.: Orthagoriscus mola Blocli & Sclineider, 1801, 510; 
Orthagoriscus mola Storer, Fish. Mass. 420: Orthagoriscus analis Ayres, Proc. Cal. 
Acad.'^Nat. Sci. ii, 31, f. 54: Mola rotunda Cuvier, 1800.”) 
