as 



CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 77 



but well marked, especially on the body whorl. On the last mentioned whorl the 

 nodular costse are faint and confined to the humeral angle; the spiral lirations 

 below, about 10 in number, are strong; columella long, straight. Suture more 

 or less filled by a revolving ridge." 



Midway of Mississippi and Alabama. 



Remarks. — A fragment of a large fusoid shell, probably Clavella hubbardanus 

 was found at Soldado. It shows the characteristic rather faint longitudinal 

 costse on the humeral angle of the body whorl, and the general form proves that 

 the Soldado shell was either identical with or closely allied to the Mississippi 

 and Alabama species. 



The illustration is of Professor Harris' type specimen from Mississippi. 



Locality.— Bed No. 2, Soldado Rock, Gulf of Paria. 



Geological horizon. — Midway Eocene. 



Genus LATIRUS Montfort, 1810. 

 Latirus tortilis Whitfield. Plate XI, Figure 1. 



Fusus tortilis Whitfield, Am. Jour. Conch., p. 260, pi. 27, fig. 5, 1865. 



Fusus tortilis Harris, Bull. Amer. Paleont., vol. I, p. 203, pi. VIII, fig. 14, 1896. 



Whitfield's original description. — " Shell elongate, fusiform; spire slender, 

 especially in the upper part, consisting of seven or eight sub-angular volutions, 

 each marked by six strong longitudinal folds or varices, which are spirally ar- 

 ranged, those of one volution being a little behind the corresponding one of the 

 preceding volution, the whole making about one-fourth of a turn in the length 

 of the spire; canal long and straight, making, with the narrow, ovate aperture, 

 rather more than one-half of the entire length; surface marked by somewhat 

 alternating revolving lines, strongest on the largest part of each volution. 



u Dimensions. — Length 1.75 inches, transverse diameter .7 inch. 



"Locality. — Nine miles below Prairie Bluff, Alabama." 



Remarks. — The single shell from Soldado, although eroded and imperfect, 

 shows the general form and traces of the characteristic spiral strisB of L. tortilis. 



On comparing the specimen from Soldado with shells of this species from the 

 Alabama, Georgia and Mississippi Midway it is seen that the Soldado form tends 

 to be somewhat larger, and broader across the last volution, with the sculpture 

 rather bolder and more angular. In the latter respect it approaches the Lignitic 

 variety nanafalina Harris from Alabama. But the typical form of L. tortilis 

 sometimes as at Matthew's Landing, Alabama, developed during the Lignitic 

 into larger and heavier shells than that from Soldado. Hence there seems no 

 doubt that it is the same species. 



Height of Soldado fragment 23, greatest width 13 mm. 



Locality. — Bed No. 2, Soldado Rock, Gulf of Paria. 



Geological horizon. — Midway Eocene. Equivalent to the Midway of Alabama 

 and to that of the Rio Maria Farinha beds, State of Pernambuco, Brazil. 



Vfl 



