730 SYSTEMATIC PALEONTOLOGY 



TEREDO IRREGULARIS Gabb 



Teredo tibialis Morton, 1834, Syn. Org. Rem. Cret. Group U. S., p. 68 (ex 



parte) . 

 Teredo irregularis Gabb, 1860, Jour. Acad. Nat. Sci., Phila., 2d ser., vol. iv, 



p. 393, pi. Ixviii, fig. 19. 

 Teredo contorta Meek, 1864, Check List Inv. Fossils, N. A., Cret. and Jur., 



p. 16. 



Teredo irregularis Meek, 1864, Ibidem. 



Teredo contorta Conrad, 1868, Cook's Geol. of New Jersey, p. 727. 

 Teredo irregularis Conrad, 1868, Ibidem. 

 Teredo irregularis Whitfield, 1885, Mon. U. S. Geol. Survey, vol. ix, p. 191, 



pi. xxv, figs. 18, 19. 



Teredo irregularis Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 18. 

 Teredo contorta Johnson, 1905, Ibidem. 

 Teredo irregularis Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 656, pi. Ixxiv, figs. 1-3. 



Description. " Tube irregular, tortuous, dilated in places and some- 

 times transversely wrinkled. Shell twice as large as that of T. tibialis, 

 more abruptly truncate anteriorly." Gabb, I860. 



Type Locality. ? New Jersey. 



" Tubes as shown by their casts gregarious, exceedingly tortuous and 

 contorted, sometimes annulated, increasing gradually in size from their 

 point of origin, the larger ones reaching a diameter of 10 mm. or more. 

 Shell subglobular, cordate in outline from in front, the beaks a little in 

 front of the middle of the hinge line, widely gaping behind and open in 

 front ; the postero-cardinal extremity somewhat produced in a rounded 

 lobe. Anterior margin rounding from the hinge line above into the upper 

 margin of the large, deep, subrectangular, antero-basal hiatus which 

 reaches above the mid-height of the shell ; basal margin short ; posterior 

 margin obliquely subtruncate below, bent abruptly backward near the 

 hinge line and continuing around the postero-cardinal lobe of the shell. 

 Valves ventricose, the beaks prominent, much elevated above the hinge line 

 and strongly incurved or enrolled ; the surface curving steeply towards the 

 antero-cardinal extremity and then deflected shortly before reaching the 

 margin, curving less abruptly to the postero-cardinal extremity. In the 

 casts a very deep and prominent furrow passes from the hinge line just 

 back of the beaks to the posterior margin just below the post-cardinal lobe 



