340 TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY 



V^^--r^-- roslcar/' 



-sphot 



'epLot 



cit u Coitus 



octodecimospinosus 



A Trigia hirundo 



Peri sted ion 



Fig. 221. A. Trigia. B. Peristedion. C. Cottus. All after Allis. 



