464 PROCEEDINGS OF THE ACADEMY OF [1898. 



smooth between the costse, while the lens shows the interstices of T. 

 t'ilira to have numerous, minute, raised revolving lines. The spe- 

 cimens are all greatly broken, the largest, showing five whorls, is 

 14 mill, in length, but the fragments indicate that it probably at- 

 tains the size of the average T. trilira, about 50 mill. 



Tuba? reticulata n. ap. 



Tuba ? reticulata Johnson, n. sp. Annual Rept. Geol. Sur. N. J., 1897, page 

 264, name only. 



Whorls very convex, with four equidistant, revolving, raised 

 lines, which are crossed by equidistant longitudinal ribs of a corre- 

 sponding size, which form equal, quadrate interstices, except below 

 the suture where the longitudinal ribs become obsolete. At the 

 junction of the two series of raised lines are small tubercles through- 

 out the entire shell. Owing to the imperfect apertures of the five 

 specimens, its generic position remains doubtful, but its distinct 

 sculpture will distinguish the species. Length of the largest speci- 

 mens, 6 mill.; probably attains the length of about 10 mill. 



Trigonia thoraoica Morton. 

 Trigonia eufalensis Gabb. 



There seems to be considerable confusion regarding these forms. 

 That T. eufalensis Gabb is only the young of T. thoracica Morton 

 can be readily proven by the large suite collected by the writer at 

 Eufaula and Prairie Bluff, Alabama. Morton's type came from the 

 latter locality. The species recorded from Reeve's clay bank near 

 Lenola, N. J., is T. thoracica, not T. mortoni Whitfield. 



