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Bui,i3TiN 35 



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not however take that view. One beautiful example has 

 the transverse eostellse fjlarger and more distant than the 

 spiral ones, the latter being thread-like and rising upon 

 the former. In this example the spiral striation of the 

 base is also more marked. Sc. leroyi may be compared 

 with Sc. magnified Sow. ; but there are points of resem- 

 blance between it and Sc. deenssata, raricosta, and lineata. 

 None of the recent Westindian species bear any resem- 

 blance to the fossil except in that general shape which is 

 common to nearly all the members of the genus. On the 

 whole however the nearest ally of the Jamaican fossil may 

 perhaps be found in Sc. tenuistriata Orb. (Bahia Blanca). 

 Ringicula tridentata n. sp. 



Ovate-conic, moderately thick, smooth, shining. Spire 

 conic. Whorls about 4. Aperture suboval : columella 

 thickened and bearing two strong spiral plaits, the callus 

 continued backward, and carrying a stout tooth on the 

 body-whorl ; the latter separated by a deep notch or canal 

 from the thickened and somewhat everted outer lip. 

 Length nearly 2 mm. , breadth about 1 . 



Distinguished from R. semistriata Orb. (Cuba shells, 

 vol. ii, p. 103, pi. xxi, f. 17 — 18) by a wider mouth and 

 less thickened outer lip. R. tridentata does not exhibit any 

 trace of the striation which marks .the anterior portion of 

 R. semistriata, which was described by D'Orbigny as a 

 recent shell from Jamaica. 



Naticina regia n. sp., PI. II, f. 6.* 



Oval oblong, spirally striated by fine equidistant grooves, 

 which are crossed by a few rather irregular lines of growth. 

 Whorls about 5, the last very large. Spire short, acumi- 

 nate. Aperture semioval rather narrowed above. Umbili- 

 cus round, very partially hidden by the everted columella 



[" x "Geological Magazine, vol. 11, 1874, pi. 17.] 



