337 Costa Rica Miocknk — Olsson 55 



Shell small, with a high smooth, conic spire of about 12 

 whorls the earlier post-nuclear whorls are finely nodulated, the 

 succeeding have the sutures carinated and then simple; bodj^- 

 whorl with 20 or more strong, beaded, spiral cords; three spiral 

 cords are usually double or incised with a median line, especially 

 on the anterior canal; the beading of the spiral cords is develop- 

 ed best on their posterior portions; interspaces of the cords near- 

 ly as wide as the cords themselves, smooth or with faint, longi- 

 tudinal lines and frequently a small median spiral. 



Length 30, breadth 13 mm. 

 Gahui Stage: Mt. Hope. 



FAMILY TURRITID^ 



Genus TURRICULA Schumacher 



Section Surcula H. and A. Adams 



Turricula lavinoides, n. sp. Plate 4, figure 6 



Shell rather large and moderately solid; whorls about 12 in 

 number, heavily sculptured with ribs and spiral cords; nucleus 

 of two smooth, slightly bulbous whorls; post-nuclear whorls in- 

 creasing uniformily in size; concave above, widest below the per- 

 iphery; suture strongly appressed with a spiral cord in front of 

 it; anal fascicle flat or concave, appearing nearly smooth except 

 for about three, small, widely spaced spirals; remainder of 

 whorls stronglj^ sculptured with 8 or 12 axial ribs which are 

 lacking from the anal fasciole and from the base of the last 

 whorl; spiral sculpture of 3 or 4 strong cords on the spire- whorls, 

 becoming 10 or more on the last whorl in addition to those of the 

 anterior canal; finer, intercalated threads are present between 

 the main spiral cords on the later whorls; the interval between 

 the spirals is finel}^ longitudinal!}^ striated by long growth lines; 

 anterior canal long and nearly straight, slightly calloused along 



