interlateral 

 anterior ventromedial anterior lateral 



splnole 



anterior dorsolateral 

 posterior dorsolateral 

 dorsomedial 

 posterior ventrolateral-^ 



ARCTOLEPID COCCOSTEUS 



Figure 6-71. Evolution of trunk armor as suggested by Westoll (1958). Reversing direction 

 of arrows A and B gives the sequence proposed by Stensio (1959). 



B 



dorsal articular plate, 

 axillor plate 



dorsomedial marginal series 

 central series 



lateral marginal series 



terminal plate 



ventral articular plate 



lateral marginal series 

 ventromedial series 



terminal plate 



dorsol articular plate 



lateral marginal plate 



_X_dorsal anconeal plate 

 |\ (lacking in Bo/hrio/ep/sj 



~'— V-medial marginal plate 



medial marginal series 

 dorsal central series 

 ateral marginal series 



terminal plate 



ventral articular plate 



-lateral marginal plate 



.ventral anconeal plate 



-medial marginal series 

 -ventral central series 

 -lateral marginal series 



terminal plate 



H 



REMIGOLEPIS ASTEROLEPIS PTERICHTHODES BOTHRIOLEPIS 

 SP. MAXIMUS MILLERI CANADENSIS 



Figure 6-72. Dorsal and ventral views of the pectoral fins of Remigo/epis, A and E, Astero/epis, 

 B and F, Pfenchthodes, C and G, and Bothno/epis, D and H. (After Stensio, 1948) 



190 



THE VERTEBRATE BODY SKELETON 



