564 Forty-fifth Report on the State Museum. 



is therefore unclosed for nearly the entire length of the hinge- 

 line. 



External surface covered with concentric lines, which terminate 

 abruptly at the cardinal line. 



Shell substance calcareous. 



Type, Kittorgina cingulata, Billings. (Cambrian.) 



A number of species from North America, Sweden and Great 

 Britain have been referred to this genus, but it is doubtful if they 

 are all congeneric. Some of them probably belong to Paterina, 

 Beecher, and others to Scbizopholis, Waagen. 



Schizopholis, Waagen. 1885. 



Shells of very small size. Pedicle-valve slightly elevated, with 

 a somewhat prominent marginal apex, below which is a small 

 triangular area, crossed in the middle by a triangular fissure, a 

 little widened at the top, forming a kind of foramen, placed 



Schizopholis rugosa. Pedicle- 

 valve. After Waagen. 

 Fig. 259.— Upper view. 

 Fig. 260 —Cardinal view. 



just at the extremity of the apex. Brachial valve flat; 

 imperforate. 



Shell surface finely granular. 



Of the internal characters of the genus nothing is known. 



Type, SchizophoUs rugosa, Waagen. 



Distribution. Cambrian (India; North America. \ Latourensis^ 

 Matthew (sp.); S.panrbula,) White (sp.). 



116 



