i28 Bulletin 29 292 



Serpulorbis papulosus Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1585, 

 1903. 



Guppy described a slender tip from Bowden. His figure is 

 very "misleading, but he describes the characteristic rows of tu- 

 bercles interlined with crenate strise. Our party found this spe- 

 cies in place up to eighteen inches in length but too fragile to se- 

 cure entire. 



Localities. — (Exp'd '16) Rio Cana, Guayubin to Mao 

 road (very fine); Zone F, Rio Gurabo at Los Ouemados. 



Genus Petaloconchus Lea 



Petaloconchus domingensis Sowerby 

 Plate 22, Figure 11, 



Petaloconchus domingensis Sowerby, Quart. Jour. Geol. Soc. Loudon, 



vol. 6, p. 51, pi. 10, fig. 8, a, b, c, 1849. 

 Petaloconchus sculpturatus Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 



240, 1873. Not sculpturatus Lea. 

 Petaloconchus sculpturatus Guppy ■, Ouart. Jour. Geol. Soc, vol. 32, p. 



519, 1876. 

 Vermetus {Petaloconchus) sculpturatus Dall (in part), Trans. Wagner 



Inst., vol. 3, pt. 2, pp. 305, 306, 1892. 

 Petaloconchus domingensis Brown and Pilsbry, Proc Acad. Nat. ScL 



Phila., p. 359, 191 1. 



Petaloconchus domingensis typically coils in a widening cy- 

 linder, with whorls much flattened on the sides and angulate at 

 the base. P. sculpturatus coils in a tapering cone, with whorls 

 less flattened and more convex at the base. P. domingensis oc- 

 curs at Bowden; Trinidad (Caroni Series); and Gatun. 



Localities. — (Exp'd '16) Zone B, Rio Gurabo at Los Oue- 

 mados; Bluff 1, Cercado de Mao. 



Petaloconchus Laddfranklinm , n. sp. 

 Plate 22, Figure 12 



Shell delicate, slender, gracefully spirally undulating. Sur- 

 face regularly and elegantly ornamented with many close, equi- 

 distant, longitudinal beaded cords which conform to the spira 



