348 



valvisinsequalibus, radiatim liratis, liris prominentibus, obtusis, linea 

 marginali lateraliter subflexuosa, antice siuuata ; valva dorsali ad 

 apicem obtusa subreflexa, lateribus declivibus, carina mediana lata, 

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

 lata, planulata ; deltidiis mediocribus, trigonalibus ; valva ventrali 

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

 spicuo ; ossiculo interne- niagno, f testae longitudinis, amenta ut 

 in T. dorsatd effbrmante ; margine valvarum crenulato. 



Sbell rounded subtetragonal, rather gibbous, of a palisb brown ; 

 valves unequal, with radiating prominent obtuse ridges ; marginal 

 line somewhat fiexuous 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 three here described, namely, T. dorsata, T. CJiilensis, 

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

 species. 



12. Terebeatula Soverbii (pi. lxviii. 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, haud 

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

 trigonalibus ; valva ventrali subplannlata, rotundato-subtrigona ; 

 sulco mediano lato, inconspicuo ; ossiculo interno magno, f testse 

 longitudinis, amenta ut in T. dorsatd effbrmante ; margine val- 

 varum obsoletissime subcrenulato. 



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 fiexu- 

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

 riorly, slightly reflected, with its sides inclined towards the front ; 

 mesial ridge rather obsolete, broad and rounded; perforation 

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



