TRANSACTIONS OF WAGNER 

 822 



TERTIARY FAUNA OF FLORIDA 



A species of Xylophaga too imperfect for description was obtained by Hender- 

 son and Simpson from the Oligocene marl of Bowden, Jamaica. 



Subfamily TEREDININ^E Tryon. 



Shell forming an undivided callutn and tube continuous with the valves 

 when adult, thus enclosing the animal completely, as in Fisliilana, with the 

 external surface of the valves visible on the outside of the tube. 



Genus SCYPHOMYA Ball. 



Shell resembling that of Pholadidea s. s., and with similar dorsal plates ; 

 callum voluminous, tube short, subconical, irregular, simple. Type Pliolas 

 semicostata H. C. Lea (Bost. Journ. Nat. Hist., v., pi. 24, fig. i, 1844). Coast 

 of the Carolinas. 



The shell differs entirely from that of Tcrcdina, but the manner of 

 forming a tube is much the same. It is probable that there is a pedal fissure 

 in the callum, but the specimens studied did not have this part intact. Lea 

 describes apophyses, but they are no longer present on my .specimens, in 

 which the cardinal margin recalls that of Xylophaga. 



Genus TEBEDINA Lamarck. 



Teredina Lamarck, An. s. Vert., v., p. 438, 1818. Type T. pcrsonata Lain., from the 

 Lower Eocene of Paris. 



Shell like that of Xylophaga, with a pedal fissure in the middle line of 

 the callum, the tube elongate, subcylindric, sometimes distally bifid or partially 

 septate ; umbones covered by four accessory valves soldered to the dorsal ex- 

 tension of the callum, probably representing a double protoplax and mesoplax. 

 This group differs from Teredo by the inclusion of the valves in the tube 

 and the absence of siphonal " pallets," as well as the presence of dorsal acces- 

 sory plates. 



Teredina bowdeniana n. s. 

 PLATE 36, KIGURK 4. 



Oligocene marl of Bowden, Jamaica ; Henderson and Simpson. 



The specimen obtained is the portion of a tube containing most of the 

 left valve of a Tcrcdina, with very marked sculpture. The anterior border is 

 formed by a narrow, irregularly broken strip of the shelly matter belonging to 

 the missing tube. The thin posterior border of the valve is not intact, though 

 enough remains to show the character of the sculpture. The sculpture of the 

 anterior part of the valve is composed of small, four-sided lozenges, separated 



