MARINE MOLLUSCA OF THE UNITED STATES. 199 



Genus TEREBRATULINA, Orb. 

 Comp. Rend., xxv. 2G8. 1847. 



1. T. septentrionaJ/IS, Couthouy. Figs. 548, 549. 



{Terebratula.) Bost. Journ. Nat, Hist,, ii. 65, t. 3, f. 18. 

 Terebratula caput-serjjentis, Gould (non Auct.), Invert. Mass., edit. i. 141. 



1841. 



Shell obovate, whitish or yellowish-white, thin, translucent; upper 

 valve truncated horizontally at the apex ; foramen large, one side 

 completed by the apex of the lower valve ; surface covered by 

 minute radiating striae. 



Length 15, width 12 mill. 



Maine, northicards. 



4 



Family RHYNCHONELLID^E. 



Shell with radiating ribs, the arm supports long, slender, simple, 

 and gently curving towards each other; no area; the opening for 

 the pedicle usuall}' completed by two small pieces ; animal with 

 elongated spiral arms. 



Genus RHYNCHONELLA, Fischer. 

 Mem. Soc. Imp., Moscow, ii. 1809. 



1. R. psittacea, Gmelin. Fig. 550. 

 (Anomia.) Syst. Nat., 3348. 1790. 

 Shell s obtri angular, thin, inflated, brownish or greenish ; beak 

 produced and curved ; surface radiately finely striated. The. 

 internal processes consist of two slender curved parallel prongs 

 proceeding from the base of the teeth of the upper valves. 

 Length 12, width 8 mill. 



Newfoundland, nortJitcards. 



Family LINGULID^E. 



Shell pedunculate, peduncle passing between the valves ; inar- 

 ticulate, subequivalve ; brachia unsupported by calcified processes. 



Genus GLOTTIDIA, Dall. 



Am. Journ. Conch., vi. 157. 1871. 



Shell linguiform, smooth, elongated ; neural valve furnished 

 internally with two sharp narrow incurved laminae, diverging from 



