CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 75 



Fusus sewalliana new species. Plate X, Figure 22. 



Description. — Shell rather large, original shape fusiform, number of known 

 whorls four; surface of shell handsomely sculptured by (a) longitudinal ribs, of 

 which there are ten on the last volution, these extend from the broad and shallow 

 subsutural sulcus to the succeeding suture or, on the last whorl, almost to the 

 beginning of the anterior canal; (6) by rather regular longitudinal lines of growth; 

 (c) by narrow, rounded spiral ridges which are more widely separated from one 

 another where they revolve over the most prominent part of the longitudinal 

 riblets; sutural line not well defined, wavy. 



Length of fragment 40, greatest width 20 mm. 



Remarks. — This species is unlike any known Fusidse from the Midway of 

 either North America or Brazil. In general form and type of sculpture it recalls 

 Fusus mortoni var. mortoniopsis Gabb from the Lower Claiborne Eocene of 

 Texas; but the Soldado shell is much larger and a more elegantly sculptured shell. 



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. 



The writer takes great pleasure in naming this shell in honor of Mr. Arthur 

 Sewall, of Philadelphia, in appreciation of his very great interest in the scientific 

 results of the Venezuelan Expedition. 



Fusus sirenideditus new species. Plate X, Figure 23. 



Description. — Shell large and strong with a thick and heavy columella; the 

 single specimen is very imperfectly preserved, but is sufficiently striking to merit 

 description; sculpture consisting of fairly coarse longitudinal lines of growth, 

 interrupted by strong, narrow, revolving, spiral ridges (eight on the lower three- 

 quarters of the last volution) ; above these the shell is somewhat shouldered and 

 bears a few nearly obsolete longitudinal plications; those on the penultimate 

 whorl are developed into well-marked, nodular riblets. 



Height of fragment 40, greatest width 23 mm. 



Remarks. — This species, which, when perfect, must have been a fine shell, 

 seems to be quite unique in its characters among the lower Eocene faunas. 



Locality. — Bed No. 2, Soldado Rock, Gulf of Paria. Hence the dedication to 

 the Siren of the Rock. 



Geological horizon. — Midway Eocene. 



Fusus tseniensis new species. Plate X, Figure 24. 



Description. — Shell rather small, short, fusiform; number of whorls exposed, 

 three; sculpture of (a) coarse, close-set, regular, sub-equal, revolving, spiral 

 threads which cover the entire surface of the shell; (6) well marked, nearly equi- 

 distant, longitudinal wave-like riblets, of which there are five on the exposed 

 half of the last volution; canal straight. 



Height of incomplete shell 15, greatest width 10 mm. 



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