ART. 21 



TERTIARY MOLLUSKS FROM FLORIDA MAITSFIELD 



Species 



Crassinella diipliniana Dall 



Cardita (Carditamera) arata Conrad 



Cardiia (Carditamera) tamiamiensis, new species 



Venericardia (Pleuromeris) perplana gladeensis, new 



subspecies 



Vencricarda (Pleuromeris) tridentata decemcostata 



Conrad 



Chama sp. cf. C. congregata Conrad 



Phacoides (Here) pensylvanicus (Linnaeus) var 



Phacoidcs (Pseudomiltha) anodonia (Say) 



Phacoides (Cardilucina) trisulcatus (Conrad) 



Divaricella sp. (broken) 



Diplodonta acclinis (Conrad) 



Bornia sp 



Cardium (Trachycardium) ever gladeensis, new spe- 

 cies 



Trarisennella carolinensis Dall 



Macrocallista nimbosa (Solander) . 



Venus campechiensis Gmelin 



Gemma trigona Dall 



Parastarte martensi, new species. _ 



Tellina sp. (young) 



Tagelus gibbvs (Spengler) var.?__ 



Donax sp. (fragments) 



Spisula incrassata (Conrad) 



Corbula barraltiana Adams var 



Cadulus quadridentatus Dall? 



Occur- 

 rence 



Mio- 

 cene 



Pliocene 



Recent 



CONDITIONS OF DEPOSITION AND NATURE OF FAUNA 



The matrix adhering to the outside of the shells and inclosed within 

 them consists of beachlike, medium coarse, rounded, clear quartz 

 grains, indicating a close-shoreline deposit. 



The number of species of gastropods and pelecypods with their 

 respective numbers of individuals are fairly well balanced ; 25 species 

 of gastropods and 30 species of pelecypods are present. 



Some of the shells attained a large size, as Olivella ta/miamiensis, 

 new species, Olivella juspldea gladeensis, new subspecies, Cardita 

 arata Conrad, Cardita tamiainiensis, new species, and Venericardia 

 tridentata decemcostata Conrad. 



