PLATE IV. 



Figure 10, 10. Natica fluctuata, Sowerby. 



"N. lesta subglobosa, pallida, lineis albis longitudinalibus flexuosis angulatim picla; spira bre- 

 vissima, acuta; apertura magna, siiperne acuta, infra effusa, rotundata; umbilico angusto, lecto ; 

 callo columellari expanse, infra albo, crasso, superne castaneo, tenuiore." 



Ob3. "Besides the longitudinal white zigzag lines upon a fawn-colored ground, there are four 

 transverse bands, very little darker than the ground color itself. The dark chestnut edging to the 

 expanded columella callus is a principal character of this shell." 



Sowb. TankerviUe Catalogue, Appendix, p. xii. 

 Natica imperforata, Nobis. 



Habitat, unknown. 



Remarks. I take this opportunity to return my thanks to Mr. Sowerby for 

 a beautiful copy of the above work ; and also for pointing out his prior claim to 

 the above shell. Having however figured it, I add the above description copied 

 from the Appendix to the TankerviUe Catalogue. 



Figure 11, 11, 11. Neritina granosa, Sowerby. 



" N. Testa subrotunda, compressiuscula, subalata, alba, epidermide nigra induta, extus granosa, 

 granis, per series ordinatis; labii externi margine crenulato; subtus planulata, labio columellari, 

 lato, aurantiaco, margine interno sinuato, edentulo." 



Sowerby, Tank. Cat. Appendix, page xi. 

 Sowb. Conch. lUust. Neritina, fig. 6. 

 Neritina papillosa, Nobis. 



Habitat, Sandwich Islands. 



Remarks. I am indebted to Mrs. Say for several specimens of this curious 

 and beautiful Neritina. They were brought from the Sandwich Islands by one 

 of our Missionaries. 



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