275 



Costa Rica Miocene — Olsson 103 



est above; anterior canal of medium length and slightly bent to 

 the left 



Length 21, diameter 7.5, last whorl 13, spire 11 mm. 

 A smooth species of Columbelloid aspect. It is fairly abund- 

 ant in the coral limestones near Port Limon. 

 Gatun Stage: Port Limon, 



Mitra Almagrensis Toula var. coraSiiophlSa, n. var. Plate 6, figures 18, 24 



of 3Iitra Alniagj^ensisTovLlo., 191 1, Jahrb. der K-K Geol. Reichsanstalt, 

 vol. 61, p. 491, pi. 28, fig 13. 



Shell small with a long spire and a shorter anterior canal; 

 whorls about 8, with straight or slightly convex profile; sculp- 

 ture of low, slightly elevated spiral cords, separated by inter- 

 spaces of about their own width; these interspaces are finely 

 sculptured by regular, raised, longitudinal threads; the spire- 

 whorls have about 5 spiral cords, the last whorl with about 15; 

 and smaller ones on the anterior canal; aperture subelliptical; a 

 short canal, slightly bent to the left; pillar with 3 folds and a 

 very small faint one below. 



Ivcngth 17, diameter 6, last whorl 11, spire 10 mm. 



This is a common species in the coral limestones of Limon. 

 Toula' s Mitra Al^nagrcnsis was described from Tehuantepec. 

 Our shells differ from Toula' s figure in being more slender and in 

 having the body- whorl less contracted below. 



Gatun Stage: Port Lifnon. 



Genus FUSUS Lamarck 



Fuses miocosmius, n. sp. Plate 8, figure 5 



Shell long and slender, wdth the spire and canal of nearly 

 equal length; whorls about 11 plus, very gradually tapering from 

 the small nucleus to the body- whorl; whorls convex with indis- 

 tinct, appressed sutures; the sculpture consists of large, swollen 

 ribs, separated by equally wide interspaces, and the whole 



