66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I39 



MEASUREMENTS IN MILLIMETERS 



Brachial 

 Length length Width Thickness 



Holotype 14.1 12.8 15.0 10.0 



Types.— Holotype, U.S.N.M. 549385. 



H orison and locality: — Eocene, 80 meters northeast of school, 

 Chucho Machin, Matanzas Province, Cuba. 



Discussion. — Only a single complete specimen is known of this in- 

 teresting species, but it is well preserved and some of the interior 

 details are visible through the transluscent shell. It is most like T. 

 bolcensis (Massalongo) in its symmetrical form and folding, but 

 differs in having a broader and less narrowly folded anterior commis- 

 sure, a larger foramen, and the crural supporting plates seem to be 

 somewhat shorter than those of the Italian species. 



That this species belongs to the Italian genus seems certain because 

 the crural supporting plates and socket ridges are clearly visible 

 through the thick but transluscent shell as narrowly divergent septa. 

 Visibility was made better by washing the beak and umbo of the 

 brachial valve with dilute acid to thin the shell. 



UNPLACED SPECIES 



Rhynchonella lamothei Dautzenberg (1909, p. 271). This is a com- 

 pletely costate (16 costae) species from the Pliocene of Algeria. It 

 has a sulcus on the pedicle valve with 7 costae and a prominent fold 

 with 6 costae. No details of the hinge or interior were described. It 

 is unlike any other Tertiary rhynchonelloid. 



R. (Hemithyris) vinassai Boni (1933, p. 86). Miocene, Monte Val- 

 lassa, Italy. This is a semicostate form suggestive of Aphelesia bi- 

 partita but the interior details are not figured. 



Rhynchonella washing toniana Weaver (1912, p. 55). Weaver's 

 figures of this species indicate a brachiopod with a type of ornamenta- 

 tion never seen in rhynchonelloids. Examination of specimens from 

 the Cowlitz River proves the shell to be punctate and the ornamenta- 

 tion to be that of the genus Terebratulina. The species is thus not a 

 rhynchonelloid. 



Rhynchonella meneghiniana Davidson (1870, p. 463). This is a 

 small completely costate species from the Eocene of Bolca, Italy. It is 

 quite distinct from any other Tertiary species but nothing is known 

 of its beak characters and interiors. It may be related to R. poly- 

 morpha (=Erymnaria) which may be strongly costate. 



