20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



DESCRIPTION OF GENERA AND SPECIES 

 BRACHIOPODA 



PATERINIDAE Schuchert 



MICROMITRA Meek, 1873 



MICROMITRA HAYDENI Walcott 



Plate 1, figs. 1-3 



Micromitra haydeni Walcott, Smithsonian Misc. Coll., vol. 53, No. 3, p. 55, 

 pi. 7, figs. 3, 3a, 1908; U. S. Geol. Surv. Mon. 51, p. 337, text fig. 20A-D, 

 1912. 



Walcott's types are refigured by photographs. 



Localities 54s, 59c. 



Holotype and paratypes. — U.S.N.M. No. 51437. 



PATERINA BEECHER, 1891 

 PATERINA HIRTA, n. sp. 



Plate 1, figs. 4-7 



Micromitra (Iphidclla) pannula maladensis Walcott (part), U. S. Geol. Surv. 

 Mon. 51, p. 364, pi. 4, fig. 2a, 1912. 



Part of the material assigned to /. pannula maladensis is more 

 logically regarded as a species of Paterina. Many specimens have 

 been found in addition to the one illustrated by Walcott. 



P. hirta is characterized by strong growth lines. The ventral 

 valve has a rather straight, long hinge line, and rises to the apex, 

 which is half as high as the shell is wide. The dorsal valve is nearly 

 semicircular in shape and much less convex than the high ventral 

 valve. If the illustrations of P. hirta are compared with those of 

 /. maladensis adjacent to them, the sharp distinction of surface 

 features is easily seen. On the whole P. hirta is a rather wide form. 



Locality 54s. 



Cotypes. — U.S.N.M. Nos. 98567, 51465, 51450. 



IPHIDELLA Walcott, 1905 



IPHIDELLA MALADENSIS Walcott 



Plate i, figs. 8-10 



Iphidella pannula maladensis Walcott, Proc. U. S. Nat. Mus., vol. 28, 



p. 306, 1905. 

 Micromitra (Iphidella) pannula maladensis Walcott (part), U. S. Geol. Surv. 



Mon. 51, p. 364, pi. 4, figs. 2, 2d, 2e, 2g, 1912. 



This species is restricted to specimens conspecific with the first 

 one illustrated by Walcott. He also identified other specimens as 



