i02 



concave anteriorly: aperture suborbicular: canal extremely 

 ßhort, wide, and straight, 



I^gth. of sp. 0,09 inch; tot. Igth. 0,,, inch; breadth 



0,035 inch. 



Cerithium albovittatum C. B. Ad. Contr. p. 122- 



Cerithium septemstriatum Say. Sow. Thes. Nr* 

 158. p. p. 

 Hab. Jamaica (Ad.) St, Thomas (Riise.) 



246. Bittium (Platygyra) bicolor C. B. Ad. 



„T. parva, soUdiuscula, albida, fascia rubro-fusca 

 eincta; anfr. 15 (?), planulatis, Hneis 5 elevatis decur- 

 rentibus, Bupra (2 exceptis) obsoletis, et hneis eleTatis 

 longitudinahbus pluribus, intersectionibus nodiferia in- 

 structis; anfr, ultimo phca fusca cincto: columella uni- 

 phcata, phca decurrente; canah brevi." 



„Ap. long. 0,08 poll, ; long. tot. 0,o8 poll? lat, 

 0„3 poll, 



Cerithium bicolor C, B, Ad, Bost. Proc. 1845. 

 p. 5. 

 Hab. Jamaica (Ad.) 



An sit melius inserenda post Bittium subulatum Mtg. 

 propter plicam columellarem decurrentem. 

 247. Bittium (Platygyra) cinereo-flavum Mörch. 



T. subulata, cinereo-flava, solidula; anfr. plani, liris 

 2 fere aequalibus et lirula filiforme postice ad suturam; 

 lira mediana prominentior; in anfr. ult. lira inframe- 

 diana; liras incrementi filiformes regulariter distantes 

 Intersectionibus incrassatis vix nodiferis: basi concava, 

 canali spirali cancellato ; spira lateribus rectis, apice laevi 

 flavo. 



Long. 47» mm,; lat. l'/g mm. 



var. a crocea Long, 4 mm. (Coli. Krebs.) 

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



248. Bittium (Platygyra?) gemmulosum 

 C. B. Ad. 



„Sh. conoid, turrited: reddish black, sometimes 



