92 



PALEONTOLOGY OF NEW YORK. 



Kutorgina cingnhita. 

 Altei- \Vai.cott. 

 Figs. 47, 48, Brachial and profile views. 

 Figs. 49. Interior of a brachial valve. 



and shiny, as in K. Lahradorica ; like that of Trematis, K. pannula, or Lingcl- 

 ELLA, K. sculptilis. 



" The interiors of the valves of 

 the only species we have showing 

 the interiors, K. cingulata, have 

 numerous radiating striae extend- 

 ing from the heak outward toward 

 the margins of the shell. 



" In the interior of the ventral 

 valve four pairs of scars extend 

 from the beak forward as shown in figure 1 c?, pi. ix. 



" The interior of the dorsal valve is divided midway Ijy a narrow mesial 

 ridge that separates two pairs of scars [adductors ?] ; the anterior pair small. 



" Shell-structure calcareous {K. cingulata, K. Whiifieldi), or horny {K. Lahra- 

 dorica, K. sculptilis).'''' 



Type, Kutorgina cingulata, Billings. 



Although the foregoing diagnosis furnishes many details of this group of 

 shells, it must be admitted that it is still insuflftcient to establish a satisfactory 

 comprehension of the generic characters or taxonomic position of Kutorgina. 

 Specimens of K. cingulata, from Swanton, Vermont, K. Latourensis, from Port- 

 land, N. B , and K. Prospectensis, from Lone Mountain, Nevada, which have been 

 at our disposal, fail to add any features of importance. 



In this genus we meet shells often of considerable size when compared with 

 the associated brachiopods in primordial faunas, having in the type-species at 

 least, a high, incurved pedicle-valve with the form of an Amboccelia, and a 

 subapical slope ("false cardinal area"), which, according to Walcott,* is 

 " without the trace of an opening," although this feature does not agree with 

 the diagnosis above given^ nor with the characters of the subapical ai'ea in other 

 species referred to the genus, where the open fissure appears to begin at the 

 apex and widen downwards, having very much the character seen in the genus 

 Orthis. The opposite valve, with its highly elevated marginal apex and very 

 slightly developed area, can come into contact with the pedicle-valve only at 



* Bulletin No. 30, U. S. Geological Survey, p. 103. 



