OF CONCHOLOGY. 79 



ToRiNiA SULCIFERA, Pease. 



T. orbicularis ; spira vix exserta, plana ; anfr. sulco-sejunctis, 

 noduloso-costatis, costis 4, nodis It^vibus, interstitiis striatis, 

 interstitiis costarum striatis et filo granoso cingulatis ; basis 

 piano-con vexa ; peripheria late sulcata, utrinque costa'valida 

 raargmata; umbilicus patulus, ad marginem angulatus, intus 

 profunde sulcatus, costa granosa et striis, circumscriptus ; aper- 

 turacircularis; radiatim albo et pallida fusco strigata^ apice 

 subnigra, epidermide flavescente. 



Alt. 12. Diam. 5 mill. 



Hah. Insl. Kauai. 



Shell orbicular ; spire but slightly exserted, apex flat ; whorls 

 separated by a deep groove or channel, encircled by four nodu- 

 lose ribs, nodules smooth, interstices striate, interstices between 

 the ribs striate and encircled by a granulose thread ; base flatly 

 convex ; periphery widely grooved, angulate on either side, and 

 bordered by a strong rib; umbilicus open, occupying one-half 

 the diameter of the shell, angulate on its edges and broadly and 

 deeply grooved just within, encircled with a granulose rib and 

 striiB ; aperture circular ; radiately striped with white and light 

 brown, apex dark brown, epidermis yellow. 



Remarks. — T. cylindracea, Chem., is probably the nearest 

 allied species to the above, from which it difl'ers mainly in the 

 characters of its umbilicus and periphery. 



