﻿Vol. 64.] HOMCEOMOKPHY : ' SPIRIFER GLABERJ 33 



short hinge-line (referred to above, p. 29) and very small areas. 

 Since the reading of the paper the Author has found a note that 

 he had made with regard to the genus Squamularia, Gemmellaro, 

 a genus fully discussed by Dr. Girty.^ Squamularia comprises reti- 

 culate Spiriferids which have neither dental nor septal plates ; and, 

 according to Girty, many of the Upper Carboniferous species of 

 India and America referred to Reticularia are really Squamulari(B. 

 Prof. Garwood writes {in litt., Dec. 5th, 1907) that he has a British 

 Spirifer lineatus without dental plates. If so, it is perhaps a 

 Squamularia ; and it seems as if, not only between Martinia and 

 Reticularia, but among the supposed Reticularice themselves, there 

 is a most complicated homoeomorphy, only to be understood by 

 accurate observation of the internal characters. What the Author 

 regarded as Sp. lineatus has dental plates. — S. S. B., December llth, 

 1907.-] 



^ ' Carb. Form. & Faunas of Colorado ' U.S. Geol. Surv. Prof. Paper 16 

 (1903) p. 387. 



Q. J. G. S. No. 253. 



