Figure 211.— Nasal organs and 

 olfactory lamellae of representative 

 species of Sphoeroides (top row, 

 A-C) and Lagocephalus (D-F): 

 to left in each set, the nasal 

 region as seen externally, and 

 to its right the olfactory lamellae 

 as seen with top or front of nasal 



sac removed, and to its right, 

 in Lagocephalus, the outline of 

 an anteroposterior cross section 

 of the sac and lamellae. 



A, Sphoeroides trichocephalus; 



B, S. spengleri; C, S. maculatus 



D, Lagocephalus spadiceus; 



E, L. lagocephalus: F, L. 



Figure 212.— External features of 



other representative tetraodontid 



genera: Guentheridia formoaa — upper 



left, nasal region as seen externally 



(far left) and the pitted olfactory 



epithelium as seen with the top of 



the nasal sac removed; lower left, 



scales from upper middle 



region of body. 



Figure 213.— External features of 

 other representative tetraodontid 

 genera: Colomesus psittacus — upper 

 left, nasal region as seen externally 

 (far left) and the olfactory lamella 

 as seen with the front of the nasal 



sac removed; lower left, scales 

 ft'om upper middle region of body. 



