OF CONCHOLOGY. 2'^9 



ScALARiA DECUSSATA, Pease. Plate 24, fig. 10. 



Description. — T. elongata, gracilis, crassiuscula, imperforata, 

 alba ; anfr. 7, rotundatis, anguste separatis ; varicibus 7, con- 

 tinuis, larainatis, crassis, interstitiis striis minutissimis decussatis ; 

 apertura subrotundata. 



Dimensions. — Long. 9, diam. 4 mill. 



Locality. — Hawaii. 



Shell elongate, slender, rather thick, imperforate, white ; 

 whorls six, rounded, narrowly separate ; varices seven, stout, 

 regular, continuous, laminate, interstices decussated bj very 

 minute raised strias; aperture nearly round. 



ScALARiA Paumotensis, Pease. Plate 24, fig. 11. 



Description. — T. pyramidali, acuminata, crassa, imperforata, 

 Isevi, alba ; anfr. 6, rotundatis, anguste separatis ; varicibus 7, 

 crassis, continuis, recurvis ; apertura subcircularis. 



Dimensions. — Long. 9, diam. 5 mill. 



Locality. — Paumotus. 



Shell pyramidal, acuminate, thick, imperforate, smooth, white ; 

 whorls six, rounded, narrowly separate : varices seven, stout, 

 regular, continuous, recurved ; aperture nearly circular. 



The above species was found associated with S. replicata, Sow. 

 The latter species is not umbilicate, as was described. 



Scalaria crispata. Pease. Plate 24, fig. 12. 



Description. — T. tenui, elongata ; anfr. ultimo, subventricoso ; 

 alba, imperforata ; anfr. 8-9, convexis, contiguis, transversim 

 minute striata ; sutura profunda ; varicibus numerosis, parvis, 

 tenuis, crenulatis, crispatis, super suturam continuis ; apertura, 

 magna, ovalis. 



Dimensions. — Long. 20, diam. 10 mill. 



Locality. — Paumotus. 



Shell light, thin, elongate, imperforate, white ; last whorl 

 slightly ventricose ; whorls 8-9, convex, contiguous, finely striate 

 transversely ; sutures deep ; varices numerous, small, thin, 

 beautifully crisped and crenulated, continuous over the sutures ; 

 aperture large, oval. 



Somewhat allied to >S'. duhia. A variety of the above occurs 

 at the same locality, much smaller, last whorl more ventricose, 

 the varices thicker, and the transverse striae more distinct, some- 

 times also very narrowly perforate. 



