101 



Hab. Jamaica (Ad.) 



* 243. Bittium (Platygyra) vicinum Ad. 



„Sh. similar to rugulosum, but in place of the Spi- 

 ral lines are Spiral ridges, and in place of the transversa 

 ridges are slender transverse elevated lines, the propor- 

 tion of size being reversed; whorls about 8 or 9; the 

 canal is a little more developed." 



„Lgth. spir. 0,09 inch; tot. length 0,,^ inch; breadth 

 0,04 inch." 



Cerithium vicinum Ad. contr. p. 122. 



? Cerithium rugulosum Ad. Sow. Thes. Nr. 1 35 p. p. 

 Hab. Jamaica (Ad.) 



244. Bittium (Platygyra) alabastrulum Mörch. 



T. abbreviato-subulata, Candida, tenuis, anfr. liris 3 

 subasqualibus, mediana fortiore ; Urse incrementi filiformes 

 distantes, intersectionibus nodosis, interstitiis quadratis; 

 basi lirula adjecta inframediana subnodosa ; apertura 

 labro subpentagono ; lateribus spirae convexiusculis ; apice 

 eburneo. 



Long. 4'/, mm.; lat. 1^, mm. 

 Hab. St. Thomas (Riise) spm. 1. 



C clathratum Sow. Thes. f. 253 quoad formam, 

 praesertim aperturae. Differt a Bittio flavo t. majore, et 

 basi latissima. 



245. Bittium (Platygyra) albovittatum 

 C. B. Ad. 



„Sh. conoid, turrited : light yellowish brown, with 

 a Spiral white band occupying the two lower spiral 

 ridges: with 3 spiral ridges, of which the middle one 

 is most prominent, and on each whorl about 16 very 

 small transverse ridges, the intersections forming well 

 developed nodules ; anteriorly with another slightly nodu- 

 lous spiral ridge: apex acute: spire with the outlines 

 moderately curvilinear: whorls 9, a little convex, with 

 an indistinct suture , last whorl terminating abruptly. 



