FREE INSTITUTE OF SCIENCE 



TERTIARY FAUNA OF FLORIDA 



Subfamily DAVILINJE. 



Pallial line simple. 



Genus DA VILA Gray. 



/>,','i/i! Gray, Ann. Mag. N. Hist., 1853, p. 44. 

 Type />. fioli/ti Gray (MS. ?) = I). f>lnn,t Ilanley, Philippines. 



Shell compressed, rounded, smooth, with a thin epidermis and simple 

 pallia! line; laterals as in Donacilla ; left cardinal very large and prominent, 

 right cardinal obsolete; ligament small, nearly marginal; cartilage narrow, 

 elongated. 



There are three or four species, all Indo- Pacific. They are all small and 

 much alike. D. crassnla Desh. (Mesodesma i/in/ufinn GUI.) has color markings 

 near the umbones. 



Genus ANAPELLA Dall. 



Aiitipi'llti Dall, I 'roc. Mai. Soc. Loud., I, p. 213, 1895. 



Aiiiipn Gray, 1853; not Gray, 1X47. (The latter was based upon Jjisirn rnhra, other- 

 wise /''.r\'i tint I'liitiiinti Redux..) 

 Type Anapa Sinil/iii Gray, = ./. /n'l/iii'fm Ilanley, Tasmania. 



Shell subtrigonal, solid, inflated, concentrically sculptured; dorsal areas 

 obscure; beaks moderate, adjacent, somewhat anterior; valves close fitting; 

 pallial sinus absent, the pallia! line presenting a projecting angle below the 

 posterior adductor; ligament short, partly external between the beaks, partly 

 sunken and attached in a short sinus over the chondrophore, not set off from 

 the resilium by any shelly ridge; chondrophore somewhat below the level of 

 the hinge-plate, strong, its ventral margin somewhat projecting, directed back- 

 ward ; left cardinal strong, narrow, grooved at the apex, with a small obscure 

 accessory lamella ; laterals strong, rather irregular and distant ; right cardinal 

 small, nidi-, its posterior arm walling the pit, its anterior arm short, more 

 prominent, coalesccnt above; lamina? rude, normal, the vcntrals most promi- 

 nent; resilium strong, with its anterior face calcareous. 



A few species range from Tasmania to the Philippine Islands. They 

 resemble Atactodca except in the absence of a pallial sinus and in having a 

 nitler hinge. 



Subfamily ERVILIINJE. 



Shells small, thin, equilateral, concentrically sculptured or smooth ; liga- 

 ment marginal, obsolete, or absent; resilium small; hinge much concentrated; 

 laterals small, dorsal anterior lamina absent, the ventral more or less coales- 



