OF CONCHOLOGY. 153 



Rhynchonella G-rayi^ Woodw., An. and Mag. Nat. Hist. 1855, 



p. 444, pi. X, fig. 16 a, b, c. 

 Hah. Feejee Islands. 



Rhynchonella Woodwardii, A. Adams, An. and Mag. Nat. 



Hist. 1863, p. 100, No. 2. 

 Hah. Rifunsiri, 35 fms. ; Gutto, 48 fms. ; Japan. 



Rhynchonella liicida, Gld., Proc. Bost. Soc. Nat. Hist. 1860, 



p. 323. Otia Conch, p. 121. 

 Hah. Japan coast, 110 fathoms. 

 The above list is given for the convenience of students. 



Family LlNaULID^E. - 



Synopsis of Characters. 



LINGr ULID^^. — Shell pedunculate, peduncle passing between 

 the valves ; inarticulate, subequivalve containing 

 phosphate of lime. Brachia lateral, subspiral, 

 symmetrical without apophyses. 

 LINGULINJ^. — Posterior-adductor scar, median, single. 

 Shell more or less elongate. 



LiNGULA. — Elongate ; anteriorly expanded, posteriorly 

 tapering ; smooth or striated ; thin ; with a thin 

 epidermis. Substance of the valves J^impunctate, 

 traversed by excessively minute tubuli. Beaks 

 simple ; neural beak more produced. No internal 

 laminae or apophyses, except a more or less pro- 

 nounced mesial ridge. 



Glottidia. — Shell with two diverging internal laminae 

 in the neural valve proceeding from the beak, 

 and a mesial septum in the haemal valve. Other- 

 wise essentially as in Lingula ? 



LiNGULELLA. — Shell with the neural beak produced and 

 grooved for the passage of the pedicel ; rounded 

 triangular. 



* TriMERELLA. — Shell with a longitudinal septum support- 



ing a flat lozenge-shaped plate, serving as a mus- 

 cular fulcrum, and attached to the valve by its 

 lateral edges. 



* ? GOTLANDIA. — Valves distinctly articulated by grooves in 



* These two forms somewhat resemble Obolas iu shape; their mus- 

 cular impressions are not known, but perhaps they may eventually be 

 placed in the second division of the family. 



