40 THE NAUTILUS. 



above gradually tapering to an obtuse apex ; last whorl flattening at 

 the sides, elongated, having a weak basal carina, the suture very 

 obliquely descending, becoming shortly free in front. Aperture large, 

 rotund-ovate, dark reddish-brown inside ; peristome broadly flaring, 

 white on both face and reverse. Superior lamella vertical, compressed 

 and sharp, continuous with the spiral lamella. Spiral lamella short, 

 penetrating merely to a dorsal position. Inferior lamella rather re- 

 ceding, not extended upon the peristome, strongly converging toward 

 the superior lamella, ascending straightly inside, and penetrating to 

 a ventral position. Subcolumellar lamella completely immersed, 

 short. Principal plica situated high, short, extending from a latero- 

 dorsal position nearly to the lip. Lunella united with the lower end 

 of a short, curved upper palatal plica, together with it forming some- 

 what the shape of an inverted letter J. No lower palatal plica. 



Length 24, diam. 4.2, longest axis of aperture 5.5 mm. 



Sierra de Sta. Marta, U. S. of Colombia, at El Libana, at 6000 to 

 7000 ft. elevation, in moss on tree trunks. Collected by Mr. H. H. 

 Smith, May, 1898. 



This species belongs to a somewhat numerous group of plain species 

 from Colombia and Ecuador. It resembles N. femurina Jouss., of 

 Ecuador, but lias different sculpture and a longer " neck." In N. 

 crossei Hid., the aperture is narrower and oblong, not rounded-ovate 

 as in this species. 



It is named in honor of Amelia W. Smith, the devoted and capable 

 companion of her naturalist husband, on his collecting journeys 

 through the tropics of two continents. Types in Coll. A. X. S. Phila. 

 and of George H. Clapp. 



A GIGANTIC FOSSIL LUCINA. 



BY WM. H. DALL 



During the cruises of the U. S. Fish Commission steamer Albatross 

 in the West Indies, some years ago, one of the party collected some 

 fossils from various localities, and among others some large internal 

 casts of bivalves from Clairemont, St. Ann's Parish, Jamaica. 

 These, according to the investigations of Hill, must have come from 

 the Montpelier white limestone, a widespread deposit of Upper 

 Eocene or Oligocene age, but older than the Oligocene of the 



