Vol. 70.] DEVELOPMENT OF TBAGOPHVLLOCERAS LOSCOMBJ. 353 



Fig. 2. — Sutures of adult specimens of Tragophyllocerag 

 loscombi (J. Soicerby). All the figures are enlarged.. 



P(fh b 



a 



e 



[a = No. 1 of Table II, p. 343 ; b = No. 7 of Table II ; c = No. 6 of Table II. 

 d is from specimen No. 471 (Coll. F. H. Butler) : diameter = 43 mm. ; 

 umbilicus = 17 per cent. ; slightly crenulated, sharp periphery. Probably 

 a low-zonal form comparable with the next one and No. 11 of Table II ; 

 its history is unknown, e = No. 13 of Table II, and /= No. 15 of the 

 same Table.] 



2b2 



