154 Bulletin 39 326 



Genus ARCH8TECT0MICA Bolton 



Architectonica gra^ulata Lamarck Plate 13, figure 10 ,11, 12 



Solariiun granulatum Lamrack, 1822, An. sans. Vert., vol. 7, p. 3, 



Architecto7iica prespediva Tuomey and Holmes, 1857, Pleioc. Fos. S. 

 C, p. 120, pi. 26, fig, 6. 



Solarium graftulatutn Dall, 1892, Trans. Wagner Free Inst. Sci., vol. 

 3, pt. 2, p. 329. 



Solarium Villarelloi Bose, Inst. Geol. de Mexico, Numero 22, p. 30^ 

 pi. 3, figs. 4-1 1. 



Solarium gatunense Toula, 1908, Jahrb, der K-K Geol. Reichsanstalt, 

 Wien, vol. 58, p. 693, pi. 25, fig. 3. 



Solarium granulatum Maury, 1917, Bull. Amer. Pal., vol. 5, p. 295, 

 pi. 23, fig. 3. 



The Costa Rican fossils are usually quite typical and not 

 to be distinguished from recent examples of granulata. They 

 vary somewhat in their height and persistence of their spiral 

 sculpturing. The beaded and granulated character of the spir- 

 als generally becomes obsolete on the later whorls so that the 

 spiral bands appear smooth. The umbilicus is deep but nar- 

 row. 



This is a stable species ranging from the lower Miocene 

 to the recent. Its recent distribution extends from Cape Hat- 

 teras on the north, southward through the West Indies and on 

 the Pacific side from the Gulf of California to Peru. 



Height 20, greater diameter 43 mm. 

 19, 29 mm. 



12.75 2° mm. 



Gal mi Stage: GatiDi, C. Z. 



Water Cay, Panama. 

 Coll. 2, Rio Codes. 

 Banana River. 

 Rio Be ley. 



