TRANSACTIONS OF WAGNER 

 874 



TERTIARY FAUNA OF FLORIDA 



? Subfamily ANATINELLIN^E. 



Shell inflated, gaping, radiately striate; hinge with a prominent large, 

 narrow chondrophore, a short external ligament, a narrow cardinal tooth, and 

 accessory lamella in each valve without laterals. The pallial line distinct 

 without a sinus. Soft parts unknown. 



In order to classify our Tertiary Mactridce it became necessary, owing to 

 the confused state of the group, to go over and revise the whole of it, and this 

 investigation has resulted in numerous rectifications and changes, since no 

 revision of the group has been made in many years. With the idea that 

 these results may be useful for paleontologists, the subjoined synopsis of the 

 different groups is presented.* 



Subfamily MACTRINyE. 

 Genus MACTRA Linu6, 175S. 

 Mact?-a (L.) Lam., 1799. Type M. stitltorum Linne. 

 Trigojiella Da Costa, 1778 ; not Walch, 1762, or Schroter, 1776. 

 Crassatella Lam., 1799. Type C. cygnca (Chemn.) Spengler. 

 Mactia Dall, Nautilus, viii., p. 26, July, 1894. 



Dentition normal in number and distribution of teeth ; ligament set off 

 by a shelly lamina rising between chondrophore and ligament ; cardinals 

 generally coalescent above ; laterals smooth or finely granular. 



Subgenus MACTRA s. s. 



Type M. siultoriim Lin. 



Shell subequilateral, ovate-trigonal ; spur distinct, roofing the apical part 

 of the chondrophore ; anterior laterals radiating from the anterior sinus, not 

 confluent with the anterior arms of the cardinals, and the latter without ac- 

 cessory lamella ; dental armature not concentrated. 



The majority of old-world Mactras belong to this group, which is repre- 

 sented only by a single small species in the Caribbean and none on the Pacific 

 shores of America. 



There was no type mentioned by Linne, but his rule of regarding the 

 best-known, most common, or officinal species as the type would have pointed 

 to A'l. stidtonim, which was actually selected as the type by Lamarck in 1799. 

 Da Costa was not a consistently binomial writer, except in his last work, and 



* An abstract of the classification here adopted was published in the Proceedings of the Malaco- 

 logical Society, vol. i., pt. 5, pp. 203-213, London, March, 1895. 



