293 Dominican Fossils — Maury 129 



undulations of the tube. The intervals between the cords are 

 about equal in width to the cords and are smooth except for 

 very fine transverse striae. At one end two septa are visible 

 within the tube, which indicates that the shell belongs to Lea's 

 Petaloconchus. Diameter of tube 2, length' 30 mm. 



Named in honor of Mrs. Christine Ladd-Franklin. 



Locality. — (Exp'd '16) Zone E, Rio Gurabo at Los Que- 

 mados. (Rare). 



Genus Siliquaria Lamarck 



Siliquaria gurabensis, n. sp. 



Plate 22, Figure 13 



Shell small, irregularly spirally convoluted. Apex blunt, 

 convex; whorls nearly smooth, marked only by microscopic 

 transverse growth-lines and by a few, faint, nearly obsolete lon- 

 gitudinal striations. Fissure narrow, in the early whorls repre- 

 sented by a series of minute perforations, in the later whorls 

 these pores are entirely closed over, the margin of the slit being 

 irregularly crenulate. Greatest diameter of tube 2.5 mm. 



This genus has never before been reported from Santo Do- 

 mingo. It is very rare in the American Tertiaries. 



Locality. — (Exp'd ' 16) Zone D, Rio Gurabo at Los Que- 

 mados. 



Genus Turritella Lamarck 



Plate 22, Figure 14 



Turritella planigy 'rata Guppy ■, Proc. Scient. Assoc. Trinidad, p. 169, 



1867. 

 Turritella planigyrata Guppy, Geol. Mag. London, p. 408, pi. 18, fig. 



5,1874. (Very poor figure). 

 Turritella planigyrata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 240, 



1873. 

 Turritella planigyrata Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 519, 



1876. 

 Our shells seem identical with Guppy's type from the Caroni 

 Series, Trinidad. The Gatun analogue is T. gatunensis Conrad, 



