189o.] NATURAL SCIENCES OF PHILADELPHIA. 71 



Genus LATIRUS. 

 Latirus singleyi nov. sp. PI. 6, fig. 13. 



Specific characterization. — Size and general form as shown by the 

 figure; whorls 9?; 4, 5, 6, 7, 8 marked by obtuse rounded ribs, 

 which extend from suture to suture, by five strong, waving spiral 

 lines on each whorl, and by fine, sharp, and even lines of growth 

 most plainly visible between the costse ; body whorl with six obtuse 

 costaB and about. 24 raised spiral lines which, in the humeral region, 

 consists of one strong series between which finer lines alternate, but 

 below all become equal; lines of growth sharp and distinct, but fine; 

 columella with two strong, oblique folds and a rudimentary one be- 

 low; labium extending in a thin polished plate over the columella; 

 umbilicus rudimentary. 



Locality. — Elm Creek, Lee Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Texas State Museum. 

 Latirus singleyi var. PL 6, fig. 13a. 



This is smaller than the typical form and more slender with less 

 distinct lines of growth. 



Locality. — Hurricane Bayou, near Crockett, Houston Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type.- — Texas State Museum. 



Genus STREPSIDURA. 

 Strepsidura ficus Gabb. PI. 7, fig. 1. 



Whitneva ficus Gabb, Geol. Surv. Cala., Paleont., vol. 1, 1864, p. 104, pi. 28, 



fig. 216. 

 f Bulbifusus inauratus Heilp., Proc. Ac. Nat. Sci. Phila., 1890, p. 396. 



The specimen figured is about one- half the size of the California 

 types and is eroded at the summit. Other specimens, though upon 

 the whole less perfect, show the surface markings much better than 

 the figured specimen does. 



Localities.— "Ft. Tejou, Cal.," Gabb; Alum Creek Bluff, Colo- 

 rado River, not far above Smith ville, Bastrop Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Texas State Museum. 



Genus FUSUS. 

 Tusus bastropensis nov. sp. PI. 7, fig. 2. 



Specific characterization. — Size and general form as indicated in 

 the figure; whorls 13 or 14; 1 and 2 very minute, smooth, 3 and 4 

 transversely costate, 5-12 with nodose obtuse ribs, distinct in 5, 6, 



