92 PALEONTOLOGY OF NEW YORK. 



and shiny, as in K. Labradorica ; like that of Trematis, K. pannula, or Lingul- 

 ELLA, K. sculptilis. 



" The interiors of the valves of 

 the only species we have showing 1 — ' '^argihi " m i llll"M "k^.. 

 the interiors, K. cingulata, have 

 numerous radiating strice extend- 

 ing from the beak outward toward 



the margins of the shell. !vutorffinn dngvlata. 



" In the interior 01 the ventral figs. 47, 48 Brachial .iml pronie views. 



, ,. • !• i 1 Figs. 49. Interior of a brachial valve. 



valve tour pairs oi scars extend 



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



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

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



" Shell-structure calcareous {K. cingulata, K. Whitfieldi), or horny {K. Labra- 

 dorica, K. sculplilis)." 



Type, Kutorgina cingulata, Billings. 



Although the foregoing diagnosis furnishes many details of tliis group of 

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

 comprehension of the generic characters or taxonomic position of Kutorgina. 

 Specimens of A', cingulata, from Swanton, Vermont, K. Lafourensis, from Port- 

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

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



Tn 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 area in other 

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

 apex and widen downwards, having very much tlie 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. ;!0, U. S. Geological Survey, yi. Hi3. 



