348 



valvisinsequalibus, radiatim liratis, liris prominentibus, obtusis, lineu, 

 marginali lateraliter subflexuosa, antice sinuata ; valva dorsali ad 

 apicem obtusa subreflexa, lateribus declivibus, carina mediana lata, 

 obtusissima ; foramine magno, liaud integro ; area cardinali magna, 

 lata, planulata ; deltidiis mediocribiis, trigonalibus ; valva ventrali 

 latiori quam longa, subplanulata, sulco mediano lato, subincon- 

 spicuo ; ossiculo interno magno, f testse longitudinis, amenta ut 

 in T. dorsatd efformante ; margine valvarum crenulato. 



Shell rounded subtetragonal, rather gibbons, of a palish brown ; 

 valves unequal, with radiating prominent obtuse ridges ; marginal 

 line somewhat flexuous on the sides, sinuated in front ; dorsal valve 

 rather obtuse and reflected posteriorly, its sides inclined towards 

 the front, with a broad, very obtuse mesial ridge, perforation large, 

 not complete ; cardinal area large, broad and flattened ; deltidia 

 small and triangular ; ventral valve broader than long, rather flat- 

 tened, mesial groove broad, but rather indistinct ; internal appen- 

 dage large, fths the length of the valve, forming loops as in T. 

 dorsata ; margin of the valves crenulated. 



Found in the Straits of Magalhaens, in the vicinity of Port 

 Famine ; rare ; Capt. King, Brit. Mus. 



The last tlu"ee here described, namely, T. dorsata, T. Chilensis, 

 and T. flexuosa may prove to be merely varieties of the same 

 species. 



12. Terebeatula Soverbii (pi. Ixviii. f. 20, 21, 22.) King. 

 Zool. Journ. vol. v. p. 338. 



Testa rotundato-subtetragona, planiuscula, ferrugineo-subfusca ; 

 valvis insequalibus, glabris, obsoletissime radiatim liratis, liris in- 

 conspicuis ; linea marginali subflexuosa, antice rotundato-sinuata ; 

 valva dorsali ad apicem obtusa, subreflexa, lateribus declivibus, 

 carina mediana subobsoleta, lata, rotundata ; foramine magno, liaud 

 nitagro, area cardinali magna, lata, planulata, deltidiis mediocribus, 

 trigonalibus ; valva ventraK subplanulata, rotundato-subtrigona ; 

 sulco mediano lato, inconspicuo ; ossiculo interno magno, |- testae 

 longitudinis, amenta ut in T. dorsatd efi'ormante ; margine val- 

 varum obsoletissime snbcrenulato. 



Shell of a rounded somewhat tetragonal form, flatfish, of a 

 rusty brownish colour ; valves unequal, smooth, with very obsolete 

 and inconspicuous radiated ridges ; marginal line somewhat flexu- 

 ous, with a rounded sinuosity in front ; dorsal valve obtuse poste- 

 riorly, slightly reflected, M'ith its sides inclined towards the front ; 

 mesial ridge rather obsolete, broad and rounded; perforation 

 large, not entire, cardinal area large^ flattened, deltidia small and 



