Vol. 70.] DEVELOPMENT OF TRAGOPHYLLOCERAS LOSCOMBI. 357 



Fig. 3. — Sutures of various ammonites. 



uA^" 



vkfV^ 



k 



m 



\Jhf\r*- 



|J r V> 



[a-d = Tragophylloceras loscombi (Sowerby) : a — Primitive Goniatite stage ; 

 b =■ Glyphiocems-Dimovplwcems stage; c = MonophylHtes stage; d = 

 Psiloceras stage, e-h = MonophylHtes simonyi (Hauer) after Branco. 

 i='Anthracoceras discus Freeh, fe— l—Dimorphoceraa gilbertsoni (Phil.) ; 

 in = D. looneyi (Phil.), n-o = Thalassoceras gemmellaroi Karp. (n = 

 adult; = young). p = Th. microdiscus Gemm. q—Th. varicosum 

 Gemm. /• = Ussuria schamarse Diener.] 



